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commit ae5906ceee038ea29ff5162d1bcd18fb50af8b94
parent 1fc1cd8399ab5541a488a7e47b2f21537dd76c2d
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu,  7 Mar 2019 11:44:01 -0800

Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:

 - Extend LSM stacking to allow sharing of cred, file, ipc, inode, and
   task blobs. This paves the way for more full-featured LSMs to be
   merged, and is specifically aimed at LandLock and SARA LSMs. This
   work is from Casey and Kees.

 - There's a new LSM from Micah Morton: "SafeSetID gates the setid
   family of syscalls to restrict UID/GID transitions from a given
   UID/GID to only those approved by a system-wide whitelist." This
   feature is currently shipping in ChromeOS.

* 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (62 commits)
  keys: fix missing __user in KEYCTL_PKEY_QUERY
  LSM: Update list of SECURITYFS users in Kconfig
  LSM: Ignore "security=" when "lsm=" is specified
  LSM: Update function documentation for cap_capable
  security: mark expected switch fall-throughs and add a missing break
  tomoyo: Bump version.
  LSM: fix return value check in safesetid_init_securityfs()
  LSM: SafeSetID: add selftest
  LSM: SafeSetID: remove unused include
  LSM: SafeSetID: 'depend' on CONFIG_SECURITY
  LSM: Add 'name' field for SafeSetID in DEFINE_LSM
  LSM: add SafeSetID module that gates setid calls
  LSM: add SafeSetID module that gates setid calls
  tomoyo: Allow multiple use_group lines.
  tomoyo: Coding style fix.
  tomoyo: Swicth from cred->security to task_struct->security.
  security: keys: annotate implicit fall throughs
  security: keys: annotate implicit fall throughs
  security: keys: annotate implicit fall through
  capabilities:: annotate implicit fall through
  ...

Diffstat:
ADocumentation/admin-guide/LSM/SafeSetID.rst | 107+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
MDocumentation/admin-guide/LSM/index.rst | 14+++++++++++---
MDocumentation/admin-guide/kernel-parameters.txt | 12+++++++-----
MMAINTAINERS | 11+++++------
Mfs/proc/base.c | 64+++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
Mfs/proc/internal.h | 1+
Minclude/linux/capability.h | 5+++++
Minclude/linux/cred.h | 1-
Minclude/linux/lsm_hooks.h | 45++++++++++++++++++++++++++++++---------------
Minclude/linux/security.h | 43++++++++++++++++++++++++-------------------
Dinclude/linux/selinux.h | 35-----------------------------------
Mkernel/capability.c | 45+++++++++++++++++++++++++++++++++------------
Mkernel/cred.c | 13-------------
Mkernel/seccomp.c | 4++--
Mkernel/sys.c | 10+++++-----
Msecurity/Kconfig | 45+++++++++------------------------------------
Msecurity/Makefile | 2++
Msecurity/apparmor/Kconfig | 16----------------
Msecurity/apparmor/capability.c | 14+++++++-------
Msecurity/apparmor/domain.c | 4++--
Msecurity/apparmor/include/capability.h | 2+-
Msecurity/apparmor/include/cred.h | 16+++++++++++++++-
Msecurity/apparmor/include/file.h | 5++++-
Msecurity/apparmor/include/lib.h | 4++++
Msecurity/apparmor/include/task.h | 18++++--------------
Msecurity/apparmor/ipc.c | 3++-
Msecurity/apparmor/lsm.c | 67+++++++++++++++++++++++++++++++------------------------------------
Msecurity/apparmor/resource.c | 2+-
Msecurity/apparmor/task.c | 6+++---
Msecurity/commoncap.c | 28++++++++++++++++++----------
Msecurity/integrity/ima/ima_appraise.c | 1+
Msecurity/integrity/ima/ima_policy.c | 4++++
Msecurity/integrity/ima/ima_template_lib.c | 1+
Msecurity/keys/keyctl.c | 2+-
Msecurity/keys/keyring.c | 1+
Msecurity/keys/process_keys.c | 3+++
Msecurity/keys/request_key.c | 4++++
Msecurity/loadpin/loadpin.c | 8+++++++-
Asecurity/safesetid/Kconfig | 14++++++++++++++
Asecurity/safesetid/Makefile | 7+++++++
Asecurity/safesetid/lsm.c | 277+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Asecurity/safesetid/lsm.h | 33+++++++++++++++++++++++++++++++++
Asecurity/safesetid/securityfs.c | 193+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Msecurity/security.c | 648++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
Msecurity/selinux/Kconfig | 15---------------
Msecurity/selinux/Makefile | 2+-
Dsecurity/selinux/exports.c | 23-----------------------
Msecurity/selinux/hooks.c | 362+++++++++++++++++++++----------------------------------------------------------
Msecurity/selinux/include/audit.h | 3---
Msecurity/selinux/include/objsec.h | 38++++++++++++++++++++++++++++++++++----
Msecurity/selinux/selinuxfs.c | 4++--
Msecurity/selinux/ss/services.c | 1-
Msecurity/selinux/xfrm.c | 4++--
Msecurity/smack/smack.h | 44+++++++++++++++++++++++++++++++++++++++-----
Msecurity/smack/smack_access.c | 6+++---
Msecurity/smack/smack_lsm.c | 317+++++++++++++++++++++++++++----------------------------------------------------
Msecurity/smack/smackfs.c | 18+++++++++---------
Msecurity/tomoyo/audit.c | 31++++++++++++++++++++-----------
Msecurity/tomoyo/common.c | 199+++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------
Msecurity/tomoyo/common.h | 51+++++++++++++++++++++++++++------------------------
Msecurity/tomoyo/condition.c | 59+++++++++++++++++++++++++++++++++++++++++++----------------
Msecurity/tomoyo/domain.c | 76+++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------
Msecurity/tomoyo/file.c | 20++++++++++++++++++++
Msecurity/tomoyo/gc.c | 19+++++++++++++++++++
Msecurity/tomoyo/group.c | 5+++++
Msecurity/tomoyo/load_policy.c | 8++++----
Msecurity/tomoyo/memory.c | 9+++++++--
Msecurity/tomoyo/mount.c | 2++
Msecurity/tomoyo/realpath.c | 18+++++++++++++++---
Msecurity/tomoyo/securityfs_if.c | 30+++++++++++++++++-------------
Msecurity/tomoyo/tomoyo.c | 160++++++++++++++++++++++++++++++++++++++++++++++++++-----------------------------
Msecurity/tomoyo/util.c | 23++++++++++++++++++-----
Msecurity/yama/yama_lsm.c | 8+++++++-
Atools/testing/selftests/safesetid/.gitignore | 1+
Atools/testing/selftests/safesetid/Makefile | 8++++++++
Atools/testing/selftests/safesetid/config | 2++
Atools/testing/selftests/safesetid/safesetid-test.c | 334+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Atools/testing/selftests/safesetid/safesetid-test.sh | 26++++++++++++++++++++++++++
78 files changed, 2674 insertions(+), 1090 deletions(-)

diff --git a/Documentation/admin-guide/LSM/SafeSetID.rst b/Documentation/admin-guide/LSM/SafeSetID.rst @@ -0,0 +1,107 @@ +========= +SafeSetID +========= +SafeSetID is an LSM module that gates the setid family of syscalls to restrict +UID/GID transitions from a given UID/GID to only those approved by a +system-wide whitelist. These restrictions also prohibit the given UIDs/GIDs +from obtaining auxiliary privileges associated with CAP_SET{U/G}ID, such as +allowing a user to set up user namespace UID mappings. + + +Background +========== +In absence of file capabilities, processes spawned on a Linux system that need +to switch to a different user must be spawned with CAP_SETUID privileges. +CAP_SETUID is granted to programs running as root or those running as a non-root +user that have been explicitly given the CAP_SETUID runtime capability. It is +often preferable to use Linux runtime capabilities rather than file +capabilities, since using file capabilities to run a program with elevated +privileges opens up possible security holes since any user with access to the +file can exec() that program to gain the elevated privileges. + +While it is possible to implement a tree of processes by giving full +CAP_SET{U/G}ID capabilities, this is often at odds with the goals of running a +tree of processes under non-root user(s) in the first place. Specifically, +since CAP_SETUID allows changing to any user on the system, including the root +user, it is an overpowered capability for what is needed in this scenario, +especially since programs often only call setuid() to drop privileges to a +lesser-privileged user -- not elevate privileges. Unfortunately, there is no +generally feasible way in Linux to restrict the potential UIDs that a user can +switch to through setuid() beyond allowing a switch to any user on the system. +This SafeSetID LSM seeks to provide a solution for restricting setid +capabilities in such a way. + +The main use case for this LSM is to allow a non-root program to transition to +other untrusted uids without full blown CAP_SETUID capabilities. The non-root +program would still need CAP_SETUID to do any kind of transition, but the +additional restrictions imposed by this LSM would mean it is a "safer" version +of CAP_SETUID since the non-root program cannot take advantage of CAP_SETUID to +do any unapproved actions (e.g. setuid to uid 0 or create/enter new user +namespace). The higher level goal is to allow for uid-based sandboxing of system +services without having to give out CAP_SETUID all over the place just so that +non-root programs can drop to even-lesser-privileged uids. This is especially +relevant when one non-root daemon on the system should be allowed to spawn other +processes as different uids, but its undesirable to give the daemon a +basically-root-equivalent CAP_SETUID. + + +Other Approaches Considered +=========================== + +Solve this problem in userspace +------------------------------- +For candidate applications that would like to have restricted setid capabilities +as implemented in this LSM, an alternative option would be to simply take away +setid capabilities from the application completely and refactor the process +spawning semantics in the application (e.g. by using a privileged helper program +to do process spawning and UID/GID transitions). Unfortunately, there are a +number of semantics around process spawning that would be affected by this, such +as fork() calls where the program doesn???t immediately call exec() after the +fork(), parent processes specifying custom environment variables or command line +args for spawned child processes, or inheritance of file handles across a +fork()/exec(). Because of this, as solution that uses a privileged helper in +userspace would likely be less appealing to incorporate into existing projects +that rely on certain process-spawning semantics in Linux. + +Use user namespaces +------------------- +Another possible approach would be to run a given process tree in its own user +namespace and give programs in the tree setid capabilities. In this way, +programs in the tree could change to any desired UID/GID in the context of their +own user namespace, and only approved UIDs/GIDs could be mapped back to the +initial system user namespace, affectively preventing privilege escalation. +Unfortunately, it is not generally feasible to use user namespaces in isolation, +without pairing them with other namespace types, which is not always an option. +Linux checks for capabilities based off of the user namespace that ???owns??? some +entity. For example, Linux has the notion that network namespaces are owned by +the user namespace in which they were created. A consequence of this is that +capability checks for access to a given network namespace are done by checking +whether a task has the given capability in the context of the user namespace +that owns the network namespace -- not necessarily the user namespace under +which the given task runs. Therefore spawning a process in a new user namespace +effectively prevents it from accessing the network namespace owned by the +initial namespace. This is a deal-breaker for any application that expects to +retain the CAP_NET_ADMIN capability for the purpose of adjusting network +configurations. Using user namespaces in isolation causes problems regarding +other system interactions, including use of pid namespaces and device creation. + +Use an existing LSM +------------------- +None of the other in-tree LSMs have the capability to gate setid transitions, or +even employ the security_task_fix_setuid hook at all. SELinux says of that hook: +"Since setuid only affects the current process, and since the SELinux controls +are not based on the Linux identity attributes, SELinux does not need to control +this operation." + + +Directions for use +================== +This LSM hooks the setid syscalls to make sure transitions are allowed if an +applicable restriction policy is in place. Policies are configured through +securityfs by writing to the safesetid/add_whitelist_policy and +safesetid/flush_whitelist_policies files at the location where securityfs is +mounted. The format for adding a policy is '<UID>:<UID>', using literal +numbers, such as '123:456'. To flush the policies, any write to the file is +sufficient. Again, configuring a policy for a UID will prevent that UID from +obtaining auxiliary setid privileges, such as allowing a user to set up user +namespace UID mappings. diff --git a/Documentation/admin-guide/LSM/index.rst b/Documentation/admin-guide/LSM/index.rst @@ -17,9 +17,8 @@ MAC extensions, other extensions can be built using the LSM to provide specific changes to system operation when these tweaks are not available in the core functionality of Linux itself. -Without a specific LSM built into the kernel, the default LSM will be the -Linux capabilities system. Most LSMs choose to extend the capabilities -system, building their checks on top of the defined capability hooks. +The Linux capabilities modules will always be included. This may be +followed by any number of "minor" modules and at most one "major" module. For more details on capabilities, see ``capabilities(7)`` in the Linux man-pages project. @@ -30,6 +29,14 @@ order in which checks are made. The capability module will always be first, followed by any "minor" modules (e.g. Yama) and then the one "major" module (e.g. SELinux) if there is one configured. +Process attributes associated with "major" security modules should +be accessed and maintained using the special files in ``/proc/.../attr``. +A security module may maintain a module specific subdirectory there, +named after the module. ``/proc/.../attr/smack`` is provided by the Smack +security module and contains all its special files. The files directly +in ``/proc/.../attr`` remain as legacy interfaces for modules that provide +subdirectories. + .. toctree:: :maxdepth: 1 @@ -39,3 +46,4 @@ the one "major" module (e.g. SELinux) if there is one configured. Smack tomoyo Yama + SafeSetID diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt @@ -2333,6 +2333,10 @@ lsm.debug [SECURITY] Enable LSM initialization debugging output. + lsm=lsm1,...,lsmN + [SECURITY] Choose order of LSM initialization. This + overrides CONFIG_LSM, and the "security=" parameter. + machvec= [IA-64] Force the use of a particular machine-vector (machvec) in a generic kernel. Example: machvec=hpzx1_swiotlb @@ -4110,11 +4114,9 @@ Note: increases power consumption, thus should only be enabled if running jitter sensitive (HPC/RT) workloads. - security= [SECURITY] Choose a security module to enable at boot. - If this boot parameter is not specified, only the first - security module asking for security registration will be - loaded. An invalid security module name will be treated - as if no module has been chosen. + security= [SECURITY] Choose a legacy "major" security module to + enable at boot. This has been deprecated by the + "lsm=" parameter. selinux= [SELINUX] Disable or enable SELinux at boot time. Format: { "0" | "1" } diff --git a/MAINTAINERS b/MAINTAINERS @@ -15557,12 +15557,11 @@ F: mm/shmem.c TOMOYO SECURITY MODULE M: Kentaro Takeda <takedakn@nttdata.co.jp> M: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> -L: tomoyo-dev-en@lists.sourceforge.jp (subscribers-only, for developers in English) -L: tomoyo-users-en@lists.sourceforge.jp (subscribers-only, for users in English) -L: tomoyo-dev@lists.sourceforge.jp (subscribers-only, for developers in Japanese) -L: tomoyo-users@lists.sourceforge.jp (subscribers-only, for users in Japanese) -W: http://tomoyo.sourceforge.jp/ -T: quilt http://svn.sourceforge.jp/svnroot/tomoyo/trunk/2.5.x/tomoyo-lsm/patches/ +L: tomoyo-dev-en@lists.osdn.me (subscribers-only, for developers in English) +L: tomoyo-users-en@lists.osdn.me (subscribers-only, for users in English) +L: tomoyo-dev@lists.osdn.me (subscribers-only, for developers in Japanese) +L: tomoyo-users@lists.osdn.me (subscribers-only, for users in Japanese) +W: https://tomoyo.osdn.jp/ S: Maintained F: security/tomoyo/ diff --git a/fs/proc/base.c b/fs/proc/base.c @@ -140,9 +140,13 @@ struct pid_entry { #define REG(NAME, MODE, fops) \ NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) #define ONE(NAME, MODE, show) \ - NOD(NAME, (S_IFREG|(MODE)), \ + NOD(NAME, (S_IFREG|(MODE)), \ NULL, &proc_single_file_operations, \ { .proc_show = show } ) +#define ATTR(LSM, NAME, MODE) \ + NOD(NAME, (S_IFREG|(MODE)), \ + NULL, &proc_pid_attr_operations, \ + { .lsm = LSM }) /* * Count the number of hardlinks for the pid_entry table, excluding the . @@ -2521,7 +2525,7 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, if (!task) return -ESRCH; - length = security_getprocattr(task, + length = security_getprocattr(task, PROC_I(inode)->op.lsm, (char*)file->f_path.dentry->d_name.name, &p); put_task_struct(task); @@ -2570,7 +2574,9 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, if (rv < 0) goto out_free; - rv = security_setprocattr(file->f_path.dentry->d_name.name, page, count); + rv = security_setprocattr(PROC_I(inode)->op.lsm, + file->f_path.dentry->d_name.name, page, + count); mutex_unlock(&current->signal->cred_guard_mutex); out_free: kfree(page); @@ -2584,13 +2590,53 @@ static const struct file_operations proc_pid_attr_operations = { .llseek = generic_file_llseek, }; +#define LSM_DIR_OPS(LSM) \ +static int proc_##LSM##_attr_dir_iterate(struct file *filp, \ + struct dir_context *ctx) \ +{ \ + return proc_pident_readdir(filp, ctx, \ + LSM##_attr_dir_stuff, \ + ARRAY_SIZE(LSM##_attr_dir_stuff)); \ +} \ +\ +static const struct file_operations proc_##LSM##_attr_dir_ops = { \ + .read = generic_read_dir, \ + .iterate = proc_##LSM##_attr_dir_iterate, \ + .llseek = default_llseek, \ +}; \ +\ +static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \ + struct dentry *dentry, unsigned int flags) \ +{ \ + return proc_pident_lookup(dir, dentry, \ + LSM##_attr_dir_stuff, \ + ARRAY_SIZE(LSM##_attr_dir_stuff)); \ +} \ +\ +static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \ + .lookup = proc_##LSM##_attr_dir_lookup, \ + .getattr = pid_getattr, \ + .setattr = proc_setattr, \ +} + +#ifdef CONFIG_SECURITY_SMACK +static const struct pid_entry smack_attr_dir_stuff[] = { + ATTR("smack", "current", 0666), +}; +LSM_DIR_OPS(smack); +#endif + static const struct pid_entry attr_dir_stuff[] = { - REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), - REG("prev", S_IRUGO, proc_pid_attr_operations), - REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), - REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), - REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), - REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), + ATTR(NULL, "current", 0666), + ATTR(NULL, "prev", 0444), + ATTR(NULL, "exec", 0666), + ATTR(NULL, "fscreate", 0666), + ATTR(NULL, "keycreate", 0666), + ATTR(NULL, "sockcreate", 0666), +#ifdef CONFIG_SECURITY_SMACK + DIR("smack", 0555, + proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops), +#endif }; static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) diff --git a/fs/proc/internal.h b/fs/proc/internal.h @@ -82,6 +82,7 @@ union proc_op { int (*proc_show)(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task); + const char *lsm; }; struct proc_inode { diff --git a/include/linux/capability.h b/include/linux/capability.h @@ -209,6 +209,7 @@ extern bool has_ns_capability_noaudit(struct task_struct *t, extern bool capable(int cap); extern bool ns_capable(struct user_namespace *ns, int cap); extern bool ns_capable_noaudit(struct user_namespace *ns, int cap); +extern bool ns_capable_setid(struct user_namespace *ns, int cap); #else static inline bool has_capability(struct task_struct *t, int cap) { @@ -240,6 +241,10 @@ static inline bool ns_capable_noaudit(struct user_namespace *ns, int cap) { return true; } +static inline bool ns_capable_setid(struct user_namespace *ns, int cap) +{ + return true; +} #endif /* CONFIG_MULTIUSER */ extern bool privileged_wrt_inode_uidgid(struct user_namespace *ns, const struct inode *inode); extern bool capable_wrt_inode_uidgid(const struct inode *inode, int cap); diff --git a/include/linux/cred.h b/include/linux/cred.h @@ -15,7 +15,6 @@ #include <linux/capability.h> #include <linux/init.h> #include <linux/key.h> -#include <linux/selinux.h> #include <linux/atomic.h> #include <linux/uidgid.h> #include <linux/sched.h> diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h @@ -1270,7 +1270,7 @@ * @cred contains the credentials to use. * @ns contains the user namespace we want the capability in * @cap contains the capability <include/linux/capability.h>. - * @audit contains whether to write an audit message or not + * @opts contains options for the capable check <include/linux/security.h> * Return 0 if the capability is granted for @tsk. * @syslog: * Check permission before accessing the kernel message ring or changing @@ -1446,8 +1446,10 @@ union security_list_options { const kernel_cap_t *effective, const kernel_cap_t *inheritable, const kernel_cap_t *permitted); - int (*capable)(const struct cred *cred, struct user_namespace *ns, - int cap, int audit); + int (*capable)(const struct cred *cred, + struct user_namespace *ns, + int cap, + unsigned int opts); int (*quotactl)(int cmds, int type, int id, struct super_block *sb); int (*quota_on)(struct dentry *dentry); int (*syslog)(int type); @@ -2028,6 +2030,18 @@ struct security_hook_list { } __randomize_layout; /* + * Security blob size or offset data. + */ +struct lsm_blob_sizes { + int lbs_cred; + int lbs_file; + int lbs_inode; + int lbs_ipc; + int lbs_msg_msg; + int lbs_task; +}; + +/* * Initializing a security_hook_list structure takes * up a lot of space in a source file. This macro takes * care of the common case and reduces the amount of @@ -2042,9 +2056,21 @@ extern char *lsm_names; extern void security_add_hooks(struct security_hook_list *hooks, int count, char *lsm); +#define LSM_FLAG_LEGACY_MAJOR BIT(0) +#define LSM_FLAG_EXCLUSIVE BIT(1) + +enum lsm_order { + LSM_ORDER_FIRST = -1, /* This is only for capabilities. */ + LSM_ORDER_MUTABLE = 0, +}; + struct lsm_info { const char *name; /* Required. */ + enum lsm_order order; /* Optional: default is LSM_ORDER_MUTABLE */ + unsigned long flags; /* Optional: flags describing LSM */ + int *enabled; /* Optional: controlled by CONFIG_LSM */ int (*init)(void); /* Required. */ + struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */ }; extern struct lsm_info __start_lsm_info[], __end_lsm_info[]; @@ -2084,17 +2110,6 @@ static inline void security_delete_hooks(struct security_hook_list *hooks, #define __lsm_ro_after_init __ro_after_init #endif /* CONFIG_SECURITY_WRITABLE_HOOKS */ -extern int __init security_module_enable(const char *module); -extern void __init capability_add_hooks(void); -#ifdef CONFIG_SECURITY_YAMA -extern void __init yama_add_hooks(void); -#else -static inline void __init yama_add_hooks(void) { } -#endif -#ifdef CONFIG_SECURITY_LOADPIN -void __init loadpin_add_hooks(void); -#else -static inline void loadpin_add_hooks(void) { }; -#endif +extern int lsm_inode_alloc(struct inode *inode); #endif /* ! __LINUX_LSM_HOOKS_H */ diff --git a/include/linux/security.h b/include/linux/security.h @@ -54,9 +54,12 @@ struct xattr; struct xfrm_sec_ctx; struct mm_struct; +/* Default (no) options for the capable function */ +#define CAP_OPT_NONE 0x0 /* If capable should audit the security request */ -#define SECURITY_CAP_NOAUDIT 0 -#define SECURITY_CAP_AUDIT 1 +#define CAP_OPT_NOAUDIT BIT(1) +/* If capable is being called by a setid function */ +#define CAP_OPT_INSETID BIT(2) /* LSM Agnostic defines for sb_set_mnt_opts */ #define SECURITY_LSM_NATIVE_LABELS 1 @@ -72,7 +75,7 @@ enum lsm_event { /* These functions are in security/commoncap.c */ extern int cap_capable(const struct cred *cred, struct user_namespace *ns, - int cap, int audit); + int cap, unsigned int opts); extern int cap_settime(const struct timespec64 *ts, const struct timezone *tz); extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode); extern int cap_ptrace_traceme(struct task_struct *parent); @@ -207,10 +210,10 @@ int security_capset(struct cred *new, const struct cred *old, const kernel_cap_t *effective, const kernel_cap_t *inheritable, const kernel_cap_t *permitted); -int security_capable(const struct cred *cred, struct user_namespace *ns, - int cap); -int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns, - int cap); +int security_capable(const struct cred *cred, + struct user_namespace *ns, + int cap, + unsigned int opts); int security_quotactl(int cmds, int type, int id, struct super_block *sb); int security_quota_on(struct dentry *dentry); int security_syslog(int type); @@ -366,8 +369,10 @@ int security_sem_semctl(struct kern_ipc_perm *sma, int cmd); int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops, unsigned nsops, int alter); void security_d_instantiate(struct dentry *dentry, struct inode *inode); -int security_getprocattr(struct task_struct *p, char *name, char **value); -int security_setprocattr(const char *name, void *value, size_t size); +int security_getprocattr(struct task_struct *p, const char *lsm, char *name, + char **value); +int security_setprocattr(const char *lsm, const char *name, void *value, + size_t size); int security_netlink_send(struct sock *sk, struct sk_buff *skb); int security_ismaclabel(const char *name); int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen); @@ -462,14 +467,11 @@ static inline int security_capset(struct cred *new, } static inline int security_capable(const struct cred *cred, - struct user_namespace *ns, int cap) + struct user_namespace *ns, + int cap, + unsigned int opts) { - return cap_capable(cred, ns, cap, SECURITY_CAP_AUDIT); -} - -static inline int security_capable_noaudit(const struct cred *cred, - struct user_namespace *ns, int cap) { - return cap_capable(cred, ns, cap, SECURITY_CAP_NOAUDIT); + return cap_capable(cred, ns, cap, opts); } static inline int security_quotactl(int cmds, int type, int id, @@ -1112,15 +1114,18 @@ static inline int security_sem_semop(struct kern_ipc_perm *sma, return 0; } -static inline void security_d_instantiate(struct dentry *dentry, struct inode *inode) +static inline void security_d_instantiate(struct dentry *dentry, + struct inode *inode) { } -static inline int security_getprocattr(struct task_struct *p, char *name, char **value) +static inline int security_getprocattr(struct task_struct *p, const char *lsm, + char *name, char **value) { return -EINVAL; } -static inline int security_setprocattr(char *name, void *value, size_t size) +static inline int security_setprocattr(const char *lsm, char *name, + void *value, size_t size) { return -EINVAL; } diff --git a/include/linux/selinux.h b/include/linux/selinux.h @@ -1,35 +0,0 @@ -/* - * SELinux services exported to the rest of the kernel. - * - * Author: James Morris <jmorris@redhat.com> - * - * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com> - * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> - * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2, - * as published by the Free Software Foundation. - */ -#ifndef _LINUX_SELINUX_H -#define _LINUX_SELINUX_H - -struct selinux_audit_rule; -struct audit_context; -struct kern_ipc_perm; - -#ifdef CONFIG_SECURITY_SELINUX - -/** - * selinux_is_enabled - is SELinux enabled? - */ -bool selinux_is_enabled(void); -#else - -static inline bool selinux_is_enabled(void) -{ - return false; -} -#endif /* CONFIG_SECURITY_SELINUX */ - -#endif /* _LINUX_SELINUX_H */ diff --git a/kernel/capability.c b/kernel/capability.c @@ -93,9 +93,7 @@ static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy) break; case _LINUX_CAPABILITY_VERSION_2: warn_deprecated_v2(); - /* - * fall through - v3 is otherwise equivalent to v2. - */ + /* fall through - v3 is otherwise equivalent to v2. */ case _LINUX_CAPABILITY_VERSION_3: *tocopy = _LINUX_CAPABILITY_U32S_3; break; @@ -299,7 +297,7 @@ bool has_ns_capability(struct task_struct *t, int ret; rcu_read_lock(); - ret = security_capable(__task_cred(t), ns, cap); + ret = security_capable(__task_cred(t), ns, cap, CAP_OPT_NONE); rcu_read_unlock(); return (ret == 0); @@ -340,7 +338,7 @@ bool has_ns_capability_noaudit(struct task_struct *t, int ret; rcu_read_lock(); - ret = security_capable_noaudit(__task_cred(t), ns, cap); + ret = security_capable(__task_cred(t), ns, cap, CAP_OPT_NOAUDIT); rcu_read_unlock(); return (ret == 0); @@ -363,7 +361,9 @@ bool has_capability_noaudit(struct task_struct *t, int cap) return has_ns_capability_noaudit(t, &init_user_ns, cap); } -static bool ns_capable_common(struct user_namespace *ns, int cap, bool audit) +static bool ns_capable_common(struct user_namespace *ns, + int cap, + unsigned int opts) { int capable; @@ -372,8 +372,7 @@ static bool ns_capable_common(struct user_namespace *ns, int cap, bool audit) BUG(); } - capable = audit ? security_capable(current_cred(), ns, cap) : - security_capable_noaudit(current_cred(), ns, cap); + capable = security_capable(current_cred(), ns, cap, opts); if (capable == 0) { current->flags |= PF_SUPERPRIV; return true; @@ -394,7 +393,7 @@ static bool ns_capable_common(struct user_namespace *ns, int cap, bool audit) */ bool ns_capable(struct user_namespace *ns, int cap) { - return ns_capable_common(ns, cap, true); + return ns_capable_common(ns, cap, CAP_OPT_NONE); } EXPORT_SYMBOL(ns_capable); @@ -412,11 +411,30 @@ EXPORT_SYMBOL(ns_capable); */ bool ns_capable_noaudit(struct user_namespace *ns, int cap) { - return ns_capable_common(ns, cap, false); + return ns_capable_common(ns, cap, CAP_OPT_NOAUDIT); } EXPORT_SYMBOL(ns_capable_noaudit); /** + * ns_capable_setid - Determine if the current task has a superior capability + * in effect, while signalling that this check is being done from within a + * setid syscall. + * @ns: The usernamespace we want the capability in + * @cap: The capability to be tested for + * + * Return true if the current task has the given superior capability currently + * available for use, false if not. + * + * This sets PF_SUPERPRIV on the task if the capability is available on the + * assumption that it's about to be used. + */ +bool ns_capable_setid(struct user_namespace *ns, int cap) +{ + return ns_capable_common(ns, cap, CAP_OPT_INSETID); +} +EXPORT_SYMBOL(ns_capable_setid); + +/** * capable - Determine if the current task has a superior capability in effect * @cap: The capability to be tested for * @@ -448,10 +466,11 @@ EXPORT_SYMBOL(capable); bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap) { + if (WARN_ON_ONCE(!cap_valid(cap))) return false; - if (security_capable(file->f_cred, ns, cap) == 0) + if (security_capable(file->f_cred, ns, cap, CAP_OPT_NONE) == 0) return true; return false; @@ -500,10 +519,12 @@ bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns) { int ret = 0; /* An absent tracer adds no restrictions */ const struct cred *cred; + rcu_read_lock(); cred = rcu_dereference(tsk->ptracer_cred); if (cred) - ret = security_capable_noaudit(cred, ns, CAP_SYS_PTRACE); + ret = security_capable(cred, ns, CAP_SYS_PTRACE, + CAP_OPT_NOAUDIT); rcu_read_unlock(); return (ret == 0); } diff --git a/kernel/cred.c b/kernel/cred.c @@ -760,19 +760,6 @@ bool creds_are_invalid(const struct cred *cred) { if (cred->magic != CRED_MAGIC) return true; -#ifdef CONFIG_SECURITY_SELINUX - /* - * cred->security == NULL if security_cred_alloc_blank() or - * security_prepare_creds() returned an error. - */ - if (selinux_is_enabled() && cred->security) { - if ((unsigned long) cred->security < PAGE_SIZE) - return true; - if ((*(u32 *)cred->security & 0xffffff00) == - (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8)) - return true; - } -#endif return false; } EXPORT_SYMBOL(creds_are_invalid); diff --git a/kernel/seccomp.c b/kernel/seccomp.c @@ -445,8 +445,8 @@ static struct seccomp_filter *seccomp_prepare_filter(struct sock_fprog *fprog) * behavior of privileged children. */ if (!task_no_new_privs(current) && - security_capable_noaudit(current_cred(), current_user_ns(), - CAP_SYS_ADMIN) != 0) + security_capable(current_cred(), current_user_ns(), + CAP_SYS_ADMIN, CAP_OPT_NOAUDIT) != 0) return ERR_PTR(-EACCES); /* Allocate a new seccomp_filter */ diff --git a/kernel/sys.c b/kernel/sys.c @@ -516,7 +516,7 @@ long __sys_setreuid(uid_t ruid, uid_t euid) new->uid = kruid; if (!uid_eq(old->uid, kruid) && !uid_eq(old->euid, kruid) && - !ns_capable(old->user_ns, CAP_SETUID)) + !ns_capable_setid(old->user_ns, CAP_SETUID)) goto error; } @@ -525,7 +525,7 @@ long __sys_setreuid(uid_t ruid, uid_t euid) if (!uid_eq(old->uid, keuid) && !uid_eq(old->euid, keuid) && !uid_eq(old->suid, keuid) && - !ns_capable(old->user_ns, CAP_SETUID)) + !ns_capable_setid(old->user_ns, CAP_SETUID)) goto error; } @@ -584,7 +584,7 @@ long __sys_setuid(uid_t uid) old = current_cred(); retval = -EPERM; - if (ns_capable(old->user_ns, CAP_SETUID)) { + if (ns_capable_setid(old->user_ns, CAP_SETUID)) { new->suid = new->uid = kuid; if (!uid_eq(kuid, old->uid)) { retval = set_user(new); @@ -646,7 +646,7 @@ long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) old = current_cred(); retval = -EPERM; - if (!ns_capable(old->user_ns, CAP_SETUID)) { + if (!ns_capable_setid(old->user_ns, CAP_SETUID)) { if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) goto error; @@ -814,7 +814,7 @@ long __sys_setfsuid(uid_t uid) if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || - ns_capable(old->user_ns, CAP_SETUID)) { + ns_capable_setid(old->user_ns, CAP_SETUID)) { if (!uid_eq(kuid, old->fsuid)) { new->fsuid = kuid; if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) diff --git a/security/Kconfig b/security/Kconfig @@ -40,8 +40,7 @@ config SECURITYFS bool "Enable the securityfs filesystem" help This will build the securityfs filesystem. It is currently used by - the TPM bios character driver and IMA, an integrity provider. It is - not used by SELinux or SMACK. + various security modules (AppArmor, IMA, SafeSetID, TOMOYO, TPM). If you are unsure how to answer this question, answer N. @@ -236,45 +235,19 @@ source "security/tomoyo/Kconfig" source "security/apparmor/Kconfig" source "security/loadpin/Kconfig" source "security/yama/Kconfig" +source "security/safesetid/Kconfig" source "security/integrity/Kconfig" -choice - prompt "Default security module" - default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX - default DEFAULT_SECURITY_SMACK if SECURITY_SMACK - default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO - default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR - default DEFAULT_SECURITY_DAC - +config LSM + string "Ordered list of enabled LSMs" + default "yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor" help - Select the security module that will be used by default if the - kernel parameter security= is not specified. - - config DEFAULT_SECURITY_SELINUX - bool "SELinux" if SECURITY_SELINUX=y - - config DEFAULT_SECURITY_SMACK - bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y - - config DEFAULT_SECURITY_TOMOYO - bool "TOMOYO" if SECURITY_TOMOYO=y - - config DEFAULT_SECURITY_APPARMOR - bool "AppArmor" if SECURITY_APPARMOR=y - - config DEFAULT_SECURITY_DAC - bool "Unix Discretionary Access Controls" - -endchoice + A comma-separated list of LSMs, in initialization order. + Any LSMs left off this list will be ignored. This can be + controlled at boot with the "lsm=" parameter. -config DEFAULT_SECURITY - string - default "selinux" if DEFAULT_SECURITY_SELINUX - default "smack" if DEFAULT_SECURITY_SMACK - default "tomoyo" if DEFAULT_SECURITY_TOMOYO - default "apparmor" if DEFAULT_SECURITY_APPARMOR - default "" if DEFAULT_SECURITY_DAC + If unsure, leave this as the default. endmenu diff --git a/security/Makefile b/security/Makefile @@ -10,6 +10,7 @@ subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo subdir-$(CONFIG_SECURITY_APPARMOR) += apparmor subdir-$(CONFIG_SECURITY_YAMA) += yama subdir-$(CONFIG_SECURITY_LOADPIN) += loadpin +subdir-$(CONFIG_SECURITY_SAFESETID) += safesetid # always enable default capabilities obj-y += commoncap.o @@ -25,6 +26,7 @@ obj-$(CONFIG_SECURITY_TOMOYO) += tomoyo/ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor/ obj-$(CONFIG_SECURITY_YAMA) += yama/ obj-$(CONFIG_SECURITY_LOADPIN) += loadpin/ +obj-$(CONFIG_SECURITY_SAFESETID) += safesetid/ obj-$(CONFIG_CGROUP_DEVICE) += device_cgroup.o # Object integrity file lists diff --git a/security/apparmor/Kconfig b/security/apparmor/Kconfig @@ -14,22 +14,6 @@ config SECURITY_APPARMOR If you are unsure how to answer this question, answer N. -config SECURITY_APPARMOR_BOOTPARAM_VALUE - int "AppArmor boot parameter default value" - depends on SECURITY_APPARMOR - range 0 1 - default 1 - help - This option sets the default value for the kernel parameter - 'apparmor', which allows AppArmor to be enabled or disabled - at boot. If this option is set to 0 (zero), the AppArmor - kernel parameter will default to 0, disabling AppArmor at - boot. If this option is set to 1 (one), the AppArmor - kernel parameter will default to 1, enabling AppArmor at - boot. - - If you are unsure how to answer this question, answer 1. - config SECURITY_APPARMOR_HASH bool "Enable introspection of sha1 hashes for loaded profiles" depends on SECURITY_APPARMOR diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c @@ -110,13 +110,13 @@ static int audit_caps(struct common_audit_data *sa, struct aa_profile *profile, * profile_capable - test if profile allows use of capability @cap * @profile: profile being enforced (NOT NULL, NOT unconfined) * @cap: capability to test if allowed - * @audit: whether an audit record should be generated + * @opts: CAP_OPT_NOAUDIT bit determines whether audit record is generated * @sa: audit data (MAY BE NULL indicating no auditing) * * Returns: 0 if allowed else -EPERM */ -static int profile_capable(struct aa_profile *profile, int cap, int audit, - struct common_audit_data *sa) +static int profile_capable(struct aa_profile *profile, int cap, + unsigned int opts, struct common_audit_data *sa) { int error; @@ -126,7 +126,7 @@ static int profile_capable(struct aa_profile *profile, int cap, int audit, else error = -EPERM; - if (audit == SECURITY_CAP_NOAUDIT) { + if (opts & CAP_OPT_NOAUDIT) { if (!COMPLAIN_MODE(profile)) return error; /* audit the cap request in complain mode but note that it @@ -142,13 +142,13 @@ static int profile_capable(struct aa_profile *profile, int cap, int audit, * aa_capable - test permission to use capability * @label: label being tested for capability (NOT NULL) * @cap: capability to be tested - * @audit: whether an audit record should be generated + * @opts: CAP_OPT_NOAUDIT bit determines whether audit record is generated * * Look up capability in profile capability set. * * Returns: 0 on success, or else an error code. */ -int aa_capable(struct aa_label *label, int cap, int audit) +int aa_capable(struct aa_label *label, int cap, unsigned int opts) { struct aa_profile *profile; int error = 0; @@ -156,7 +156,7 @@ int aa_capable(struct aa_label *label, int cap, int audit) sa.u.cap = cap; error = fn_for_each_confined(label, profile, - profile_capable(profile, cap, audit, &sa)); + profile_capable(profile, cap, opts, &sa)); return error; } diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c @@ -572,7 +572,7 @@ static struct aa_label *x_to_label(struct aa_profile *profile, stack = NULL; break; } - /* fall through to X_NAME */ + /* fall through - to X_NAME */ case AA_X_NAME: if (xindex & AA_X_CHILD) /* released by caller */ @@ -975,7 +975,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) } aa_put_label(cred_label(bprm->cred)); /* transfer reference, released when cred is freed */ - cred_label(bprm->cred) = new; + set_cred_label(bprm->cred, new); done: aa_put_label(label); diff --git a/security/apparmor/include/capability.h b/security/apparmor/include/capability.h @@ -40,7 +40,7 @@ struct aa_caps { extern struct aa_sfs_entry aa_sfs_entry_caps[]; -int aa_capable(struct aa_label *label, int cap, int audit); +int aa_capable(struct aa_label *label, int cap, unsigned int opts); static inline void aa_free_cap_rules(struct aa_caps *caps) { diff --git a/security/apparmor/include/cred.h b/security/apparmor/include/cred.h @@ -23,8 +23,22 @@ #include "policy_ns.h" #include "task.h" -#define cred_label(X) ((X)->security) +static inline struct aa_label *cred_label(const struct cred *cred) +{ + struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred; + + AA_BUG(!blob); + return *blob; +} +static inline void set_cred_label(const struct cred *cred, + struct aa_label *label) +{ + struct aa_label **blob = cred->security + apparmor_blob_sizes.lbs_cred; + + AA_BUG(!blob); + *blob = label; +} /** * aa_cred_raw_label - obtain cred's label diff --git a/security/apparmor/include/file.h b/security/apparmor/include/file.h @@ -32,7 +32,10 @@ struct path; AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \ AA_EXEC_MMAP | AA_MAY_LINK) -#define file_ctx(X) ((struct aa_file_ctx *)(X)->f_security) +static inline struct aa_file_ctx *file_ctx(struct file *file) +{ + return file->f_security + apparmor_blob_sizes.lbs_file; +} /* struct aa_file_ctx - the AppArmor context the file was opened in * @lock: lock to update the ctx diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h @@ -16,6 +16,7 @@ #include <linux/slab.h> #include <linux/fs.h> +#include <linux/lsm_hooks.h> #include "match.h" @@ -55,6 +56,9 @@ const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name, size_t *ns_len); void aa_info_message(const char *str); +/* Security blob offsets */ +extern struct lsm_blob_sizes apparmor_blob_sizes; + /** * aa_strneq - compare null terminated @str to a non null terminated substring * @str: a null terminated string diff --git a/security/apparmor/include/task.h b/security/apparmor/include/task.h @@ -14,7 +14,10 @@ #ifndef __AA_TASK_H #define __AA_TASK_H -#define task_ctx(X) ((X)->security) +static inline struct aa_task_ctx *task_ctx(struct task_struct *task) +{ + return task->security + apparmor_blob_sizes.lbs_task; +} /* * struct aa_task_ctx - information for current task label change @@ -37,17 +40,6 @@ int aa_restore_previous_label(u64 cookie); struct aa_label *aa_get_task_label(struct task_struct *task); /** - * aa_alloc_task_ctx - allocate a new task_ctx - * @flags: gfp flags for allocation - * - * Returns: allocated buffer or NULL on failure - */ -static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags) -{ - return kzalloc(sizeof(struct aa_task_ctx), flags); -} - -/** * aa_free_task_ctx - free a task_ctx * @ctx: task_ctx to free (MAYBE NULL) */ @@ -57,8 +49,6 @@ static inline void aa_free_task_ctx(struct aa_task_ctx *ctx) aa_put_label(ctx->nnp); aa_put_label(ctx->previous); aa_put_label(ctx->onexec); - - kzfree(ctx); } } diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c @@ -107,7 +107,8 @@ static int profile_tracer_perm(struct aa_profile *tracer, aad(sa)->label = &tracer->label; aad(sa)->peer = tracee; aad(sa)->request = 0; - aad(sa)->error = aa_capable(&tracer->label, CAP_SYS_PTRACE, 1); + aad(sa)->error = aa_capable(&tracer->label, CAP_SYS_PTRACE, + CAP_OPT_NONE); return aa_audit(AUDIT_APPARMOR_AUTO, tracer, sa, audit_ptrace_cb); } diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c @@ -60,7 +60,7 @@ DEFINE_PER_CPU(struct aa_buffers, aa_buffers); static void apparmor_cred_free(struct cred *cred) { aa_put_label(cred_label(cred)); - cred_label(cred) = NULL; + set_cred_label(cred, NULL); } /* @@ -68,7 +68,7 @@ static void apparmor_cred_free(struct cred *cred) */ static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) { - cred_label(cred) = NULL; + set_cred_label(cred, NULL); return 0; } @@ -78,7 +78,7 @@ static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) static int apparmor_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { - cred_label(new) = aa_get_newest_label(cred_label(old)); + set_cred_label(new, aa_get_newest_label(cred_label(old))); return 0; } @@ -87,26 +87,21 @@ static int apparmor_cred_prepare(struct cred *new, const struct cred *old, */ static void apparmor_cred_transfer(struct cred *new, const struct cred *old) { - cred_label(new) = aa_get_newest_label(cred_label(old)); + set_cred_label(new, aa_get_newest_label(cred_label(old))); } static void apparmor_task_free(struct task_struct *task) { aa_free_task_ctx(task_ctx(task)); - task_ctx(task) = NULL; } static int apparmor_task_alloc(struct task_struct *task, unsigned long clone_flags) { - struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL); - - if (!new) - return -ENOMEM; + struct aa_task_ctx *new = task_ctx(task); aa_dup_task_ctx(new, task_ctx(current)); - task_ctx(task) = new; return 0; } @@ -177,14 +172,14 @@ static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, } static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, - int cap, int audit) + int cap, unsigned int opts) { struct aa_label *label; int error = 0; label = aa_get_newest_cred_label(cred); if (!unconfined(label)) - error = aa_capable(label, cap, audit); + error = aa_capable(label, cap, opts); aa_put_label(label); return error; @@ -434,21 +429,21 @@ static int apparmor_file_open(struct file *file) static int apparmor_file_alloc_security(struct file *file) { - int error = 0; - - /* freed by apparmor_file_free_security */ + struct aa_file_ctx *ctx = file_ctx(file); struct aa_label *label = begin_current_label_crit_section(); - file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL); - if (!file_ctx(file)) - error = -ENOMEM; - end_current_label_crit_section(label); - return error; + spin_lock_init(&ctx->lock); + rcu_assign_pointer(ctx->label, aa_get_label(label)); + end_current_label_crit_section(label); + return 0; } static void apparmor_file_free_security(struct file *file) { - aa_free_file_ctx(file_ctx(file)); + struct aa_file_ctx *ctx = file_ctx(file); + + if (ctx) + aa_put_label(rcu_access_pointer(ctx->label)); } static int common_file_perm(const char *op, struct file *file, u32 mask) @@ -1151,6 +1146,15 @@ static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb, } #endif +/* + * The cred blob is a pointer to, not an instance of, an aa_task_ctx. + */ +struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { + .lbs_cred = sizeof(struct aa_task_ctx *), + .lbs_file = sizeof(struct aa_file_ctx), + .lbs_task = sizeof(struct aa_task_ctx), +}; + static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), @@ -1333,8 +1337,8 @@ bool aa_g_paranoid_load = true; module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); /* Boot time disable flag */ -static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; -module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); +static int apparmor_enabled __lsm_ro_after_init = 1; +module_param_named(enabled, apparmor_enabled, int, 0444); static int __init apparmor_enabled_setup(char *str) { @@ -1479,14 +1483,8 @@ static int param_set_mode(const char *val, const struct kernel_param *kp) static int __init set_init_ctx(void) { struct cred *cred = (struct cred *)current->real_cred; - struct aa_task_ctx *ctx; - - ctx = aa_alloc_task_ctx(GFP_KERNEL); - if (!ctx) - return -ENOMEM; - cred_label(cred) = aa_get_label(ns_unconfined(root_ns)); - task_ctx(current) = ctx; + set_cred_label(cred, aa_get_label(ns_unconfined(root_ns))); return 0; } @@ -1665,12 +1663,6 @@ static int __init apparmor_init(void) { int error; - if (!apparmor_enabled || !security_module_enable("apparmor")) { - aa_info_message("AppArmor disabled by boot time parameter"); - apparmor_enabled = false; - return 0; - } - aa_secids_init(); error = aa_setup_dfa_engine(); @@ -1731,5 +1723,8 @@ alloc_out: DEFINE_LSM(apparmor) = { .name = "apparmor", + .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, + .enabled = &apparmor_enabled, + .blobs = &apparmor_blob_sizes, .init = apparmor_init, }; diff --git a/security/apparmor/resource.c b/security/apparmor/resource.c @@ -124,7 +124,7 @@ int aa_task_setrlimit(struct aa_label *label, struct task_struct *task, */ if (label != peer && - aa_capable(label, CAP_SYS_RESOURCE, SECURITY_CAP_NOAUDIT) != 0) + aa_capable(label, CAP_SYS_RESOURCE, CAP_OPT_NOAUDIT) != 0) error = fn_for_each(label, profile, audit_resource(profile, resource, new_rlim->rlim_max, peer, diff --git a/security/apparmor/task.c b/security/apparmor/task.c @@ -81,7 +81,7 @@ int aa_replace_current_label(struct aa_label *label) */ aa_get_label(label); aa_put_label(cred_label(new)); - cred_label(new) = label; + set_cred_label(new, label); commit_creds(new); return 0; @@ -138,7 +138,7 @@ int aa_set_current_hat(struct aa_label *label, u64 token) return -EACCES; } - cred_label(new) = aa_get_newest_label(label); + set_cred_label(new, aa_get_newest_label(label)); /* clear exec on switching context */ aa_put_label(ctx->onexec); ctx->onexec = NULL; @@ -172,7 +172,7 @@ int aa_restore_previous_label(u64 token) return -ENOMEM; aa_put_label(cred_label(new)); - cred_label(new) = aa_get_newest_label(ctx->previous); + set_cred_label(new, aa_get_newest_label(ctx->previous)); AA_BUG(!cred_label(new)); /* clear exec && prev information when restoring to previous context */ aa_clear_task_ctx_trans(ctx); diff --git a/security/commoncap.c b/security/commoncap.c @@ -57,7 +57,7 @@ static void warn_setuid_and_fcaps_mixed(const char *fname) * @cred: The credentials to use * @ns: The user namespace in which we need the capability * @cap: The capability to check for - * @audit: Whether to write an audit message or not + * @opts: Bitmask of options defined in include/linux/security.h * * Determine whether the nominated task has the specified capability amongst * its effective set, returning 0 if it does, -ve if it does not. @@ -68,7 +68,7 @@ static void warn_setuid_and_fcaps_mixed(const char *fname) * kernel's capable() and has_capability() returns 1 for this case. */ int cap_capable(const struct cred *cred, struct user_namespace *targ_ns, - int cap, int audit) + int cap, unsigned int opts) { struct user_namespace *ns = targ_ns; @@ -222,12 +222,11 @@ int cap_capget(struct task_struct *target, kernel_cap_t *effective, */ static inline int cap_inh_is_capped(void) { - /* they are so limited unless the current task has the CAP_SETPCAP * capability */ if (cap_capable(current_cred(), current_cred()->user_ns, - CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0) + CAP_SETPCAP, CAP_OPT_NONE) == 0) return 0; return 1; } @@ -1208,8 +1207,9 @@ int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3, || ((old->securebits & SECURE_ALL_LOCKS & ~arg2)) /*[2]*/ || (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/ || (cap_capable(current_cred(), - current_cred()->user_ns, CAP_SETPCAP, - SECURITY_CAP_AUDIT) != 0) /*[4]*/ + current_cred()->user_ns, + CAP_SETPCAP, + CAP_OPT_NONE) != 0) /*[4]*/ /* * [1] no changing of bits that are locked * [2] no unlocking of locks @@ -1304,9 +1304,10 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages) { int cap_sys_admin = 0; - if (cap_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN, - SECURITY_CAP_NOAUDIT) == 0) + if (cap_capable(current_cred(), &init_user_ns, + CAP_SYS_ADMIN, CAP_OPT_NOAUDIT) == 0) cap_sys_admin = 1; + return cap_sys_admin; } @@ -1325,7 +1326,7 @@ int cap_mmap_addr(unsigned long addr) if (addr < dac_mmap_min_addr) { ret = cap_capable(current_cred(), &init_user_ns, CAP_SYS_RAWIO, - SECURITY_CAP_AUDIT); + CAP_OPT_NONE); /* set PF_SUPERPRIV if it turns out we allow the low mmap */ if (ret == 0) current->flags |= PF_SUPERPRIV; @@ -1362,10 +1363,17 @@ struct security_hook_list capability_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(vm_enough_memory, cap_vm_enough_memory), }; -void __init capability_add_hooks(void) +static int __init capability_init(void) { security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks), "capability"); + return 0; } +DEFINE_LSM(capability) = { + .name = "capability", + .order = LSM_ORDER_FIRST, + .init = capability_init, +}; + #endif /* CONFIG_SECURITY */ diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c @@ -114,6 +114,7 @@ static void ima_set_cache_status(struct integrity_iint_cache *iint, break; case CREDS_CHECK: iint->ima_creds_status = status; + break; case FILE_CHECK: case POST_SETATTR: iint->ima_file_status = status; diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c @@ -938,10 +938,12 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) case Opt_uid_gt: case Opt_euid_gt: entry->uid_op = &uid_gt; + /* fall through */ case Opt_uid_lt: case Opt_euid_lt: if ((token == Opt_uid_lt) || (token == Opt_euid_lt)) entry->uid_op = &uid_lt; + /* fall through */ case Opt_uid_eq: case Opt_euid_eq: uid_token = (token == Opt_uid_eq) || @@ -970,9 +972,11 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) break; case Opt_fowner_gt: entry->fowner_op = &uid_gt; + /* fall through */ case Opt_fowner_lt: if (token == Opt_fowner_lt) entry->fowner_op = &uid_lt; + /* fall through */ case Opt_fowner_eq: ima_log_string_op(ab, "fowner", args[0].from, entry->fowner_op); diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c @@ -83,6 +83,7 @@ static void ima_show_template_data_ascii(struct seq_file *m, /* skip ':' and '\0' */ buf_ptr += 2; buflen -= buf_ptr - field_data->data; + /* fall through */ case DATA_FMT_DIGEST: case DATA_FMT_HEX: if (!buflen) diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c @@ -1752,7 +1752,7 @@ SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, return -EINVAL; return keyctl_pkey_query((key_serial_t)arg2, (const char __user *)arg4, - (struct keyctl_pkey_query *)arg5); + (struct keyctl_pkey_query __user *)arg5); case KEYCTL_PKEY_ENCRYPT: case KEYCTL_PKEY_DECRYPT: diff --git a/security/keys/keyring.c b/security/keys/keyring.c @@ -246,6 +246,7 @@ static unsigned long keyring_get_key_chunk(const void *data, int level) (ASSOC_ARRAY_KEY_CHUNK_SIZE - 8)); n--; offset = 1; + /* fall through */ default: offset += sizeof(chunk) - 1; offset += (level - 3) * sizeof(chunk); diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c @@ -380,6 +380,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx) case -EAGAIN: /* no key */ if (ret) break; + /* fall through */ case -ENOKEY: /* negative key */ ret = key_ref; break; @@ -404,6 +405,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx) case -EAGAIN: /* no key */ if (ret) break; + /* fall through */ case -ENOKEY: /* negative key */ ret = key_ref; break; @@ -424,6 +426,7 @@ key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx) case -EAGAIN: /* no key */ if (ret) break; + /* fall through */ case -ENOKEY: /* negative key */ ret = key_ref; break; diff --git a/security/keys/request_key.c b/security/keys/request_key.c @@ -273,16 +273,19 @@ static int construct_get_dest_keyring(struct key **_dest_keyring) } } + /* fall through */ case KEY_REQKEY_DEFL_THREAD_KEYRING: dest_keyring = key_get(cred->thread_keyring); if (dest_keyring) break; + /* fall through */ case KEY_REQKEY_DEFL_PROCESS_KEYRING: dest_keyring = key_get(cred->process_keyring); if (dest_keyring) break; + /* fall through */ case KEY_REQKEY_DEFL_SESSION_KEYRING: rcu_read_lock(); dest_keyring = key_get( @@ -292,6 +295,7 @@ static int construct_get_dest_keyring(struct key **_dest_keyring) if (dest_keyring) break; + /* fall through */ case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: dest_keyring = key_get(cred->user->session_keyring); diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c @@ -187,13 +187,19 @@ static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(kernel_load_data, loadpin_load_data), }; -void __init loadpin_add_hooks(void) +static int __init loadpin_init(void) { pr_info("ready to pin (currently %senforcing)\n", enforce ? "" : "not "); security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin"); + return 0; } +DEFINE_LSM(loadpin) = { + .name = "loadpin", + .init = loadpin_init, +}; + /* Should not be mutable after boot, so not listed in sysfs (perm == 0). */ module_param(enforce, int, 0); MODULE_PARM_DESC(enforce, "Enforce module/firmware pinning"); diff --git a/security/safesetid/Kconfig b/security/safesetid/Kconfig @@ -0,0 +1,14 @@ +config SECURITY_SAFESETID + bool "Gate setid transitions to limit CAP_SET{U/G}ID capabilities" + depends on SECURITY + select SECURITYFS + default n + help + SafeSetID is an LSM module that gates the setid family of syscalls to + restrict UID/GID transitions from a given UID/GID to only those + approved by a system-wide whitelist. These restrictions also prohibit + the given UIDs/GIDs from obtaining auxiliary privileges associated + with CAP_SET{U/G}ID, such as allowing a user to set up user namespace + UID mappings. + + If you are unsure how to answer this question, answer N. diff --git a/security/safesetid/Makefile b/security/safesetid/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the safesetid LSM. +# + +obj-$(CONFIG_SECURITY_SAFESETID) := safesetid.o +safesetid-y := lsm.o securityfs.o diff --git a/security/safesetid/lsm.c b/security/safesetid/lsm.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SafeSetID Linux Security Module + * + * Author: Micah Morton <mortonm@chromium.org> + * + * Copyright (C) 2018 The Chromium OS Authors. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ + +#define pr_fmt(fmt) "SafeSetID: " fmt + +#include <linux/hashtable.h> +#include <linux/lsm_hooks.h> +#include <linux/module.h> +#include <linux/ptrace.h> +#include <linux/sched/task_stack.h> +#include <linux/security.h> + +/* Flag indicating whether initialization completed */ +int safesetid_initialized; + +#define NUM_BITS 8 /* 128 buckets in hash table */ + +static DEFINE_HASHTABLE(safesetid_whitelist_hashtable, NUM_BITS); + +/* + * Hash table entry to store safesetid policy signifying that 'parent' user + * can setid to 'child' user. + */ +struct entry { + struct hlist_node next; + struct hlist_node dlist; /* for deletion cleanup */ + uint64_t parent_kuid; + uint64_t child_kuid; +}; + +static DEFINE_SPINLOCK(safesetid_whitelist_hashtable_spinlock); + +static bool check_setuid_policy_hashtable_key(kuid_t parent) +{ + struct entry *entry; + + rcu_read_lock(); + hash_for_each_possible_rcu(safesetid_whitelist_hashtable, + entry, next, __kuid_val(parent)) { + if (entry->parent_kuid == __kuid_val(parent)) { + rcu_read_unlock(); + return true; + } + } + rcu_read_unlock(); + + return false; +} + +static bool check_setuid_policy_hashtable_key_value(kuid_t parent, + kuid_t child) +{ + struct entry *entry; + + rcu_read_lock(); + hash_for_each_possible_rcu(safesetid_whitelist_hashtable, + entry, next, __kuid_val(parent)) { + if (entry->parent_kuid == __kuid_val(parent) && + entry->child_kuid == __kuid_val(child)) { + rcu_read_unlock(); + return true; + } + } + rcu_read_unlock(); + + return false; +} + +static int safesetid_security_capable(const struct cred *cred, + struct user_namespace *ns, + int cap, + unsigned int opts) +{ + if (cap == CAP_SETUID && + check_setuid_policy_hashtable_key(cred->uid)) { + if (!(opts & CAP_OPT_INSETID)) { + /* + * Deny if we're not in a set*uid() syscall to avoid + * giving powers gated by CAP_SETUID that are related + * to functionality other than calling set*uid() (e.g. + * allowing user to set up userns uid mappings). + */ + pr_warn("Operation requires CAP_SETUID, which is not available to UID %u for operations besides approved set*uid transitions", + __kuid_val(cred->uid)); + return -1; + } + } + return 0; +} + +static int check_uid_transition(kuid_t parent, kuid_t child) +{ + if (check_setuid_policy_hashtable_key_value(parent, child)) + return 0; + pr_warn("UID transition (%d -> %d) blocked", + __kuid_val(parent), + __kuid_val(child)); + /* + * Kill this process to avoid potential security vulnerabilities + * that could arise from a missing whitelist entry preventing a + * privileged process from dropping to a lesser-privileged one. + */ + force_sig(SIGKILL, current); + return -EACCES; +} + +/* + * Check whether there is either an exception for user under old cred struct to + * set*uid to user under new cred struct, or the UID transition is allowed (by + * Linux set*uid rules) even without CAP_SETUID. + */ +static int safesetid_task_fix_setuid(struct cred *new, + const struct cred *old, + int flags) +{ + + /* Do nothing if there are no setuid restrictions for this UID. */ + if (!check_setuid_policy_hashtable_key(old->uid)) + return 0; + + switch (flags) { + case LSM_SETID_RE: + /* + * Users for which setuid restrictions exist can only set the + * real UID to the real UID or the effective UID, unless an + * explicit whitelist policy allows the transition. + */ + if (!uid_eq(old->uid, new->uid) && + !uid_eq(old->euid, new->uid)) { + return check_uid_transition(old->uid, new->uid); + } + /* + * Users for which setuid restrictions exist can only set the + * effective UID to the real UID, the effective UID, or the + * saved set-UID, unless an explicit whitelist policy allows + * the transition. + */ + if (!uid_eq(old->uid, new->euid) && + !uid_eq(old->euid, new->euid) && + !uid_eq(old->suid, new->euid)) { + return check_uid_transition(old->euid, new->euid); + } + break; + case LSM_SETID_ID: + /* + * Users for which setuid restrictions exist cannot change the + * real UID or saved set-UID unless an explicit whitelist + * policy allows the transition. + */ + if (!uid_eq(old->uid, new->uid)) + return check_uid_transition(old->uid, new->uid); + if (!uid_eq(old->suid, new->suid)) + return check_uid_transition(old->suid, new->suid); + break; + case LSM_SETID_RES: + /* + * Users for which setuid restrictions exist cannot change the + * real UID, effective UID, or saved set-UID to anything but + * one of: the current real UID, the current effective UID or + * the current saved set-user-ID unless an explicit whitelist + * policy allows the transition. + */ + if (!uid_eq(new->uid, old->uid) && + !uid_eq(new->uid, old->euid) && + !uid_eq(new->uid, old->suid)) { + return check_uid_transition(old->uid, new->uid); + } + if (!uid_eq(new->euid, old->uid) && + !uid_eq(new->euid, old->euid) && + !uid_eq(new->euid, old->suid)) { + return check_uid_transition(old->euid, new->euid); + } + if (!uid_eq(new->suid, old->uid) && + !uid_eq(new->suid, old->euid) && + !uid_eq(new->suid, old->suid)) { + return check_uid_transition(old->suid, new->suid); + } + break; + case LSM_SETID_FS: + /* + * Users for which setuid restrictions exist cannot change the + * filesystem UID to anything but one of: the current real UID, + * the current effective UID or the current saved set-UID + * unless an explicit whitelist policy allows the transition. + */ + if (!uid_eq(new->fsuid, old->uid) && + !uid_eq(new->fsuid, old->euid) && + !uid_eq(new->fsuid, old->suid) && + !uid_eq(new->fsuid, old->fsuid)) { + return check_uid_transition(old->fsuid, new->fsuid); + } + break; + default: + pr_warn("Unknown setid state %d\n", flags); + force_sig(SIGKILL, current); + return -EINVAL; + } + return 0; +} + +int add_safesetid_whitelist_entry(kuid_t parent, kuid_t child) +{ + struct entry *new; + + /* Return if entry already exists */ + if (check_setuid_policy_hashtable_key_value(parent, child)) + return 0; + + new = kzalloc(sizeof(struct entry), GFP_KERNEL); + if (!new) + return -ENOMEM; + new->parent_kuid = __kuid_val(parent); + new->child_kuid = __kuid_val(child); + spin_lock(&safesetid_whitelist_hashtable_spinlock); + hash_add_rcu(safesetid_whitelist_hashtable, + &new->next, + __kuid_val(parent)); + spin_unlock(&safesetid_whitelist_hashtable_spinlock); + return 0; +} + +void flush_safesetid_whitelist_entries(void) +{ + struct entry *entry; + struct hlist_node *hlist_node; + unsigned int bkt_loop_cursor; + HLIST_HEAD(free_list); + + /* + * Could probably use hash_for_each_rcu here instead, but this should + * be fine as well. + */ + spin_lock(&safesetid_whitelist_hashtable_spinlock); + hash_for_each_safe(safesetid_whitelist_hashtable, bkt_loop_cursor, + hlist_node, entry, next) { + hash_del_rcu(&entry->next); + hlist_add_head(&entry->dlist, &free_list); + } + spin_unlock(&safesetid_whitelist_hashtable_spinlock); + synchronize_rcu(); + hlist_for_each_entry_safe(entry, hlist_node, &free_list, dlist) { + hlist_del(&entry->dlist); + kfree(entry); + } +} + +static struct security_hook_list safesetid_security_hooks[] = { + LSM_HOOK_INIT(task_fix_setuid, safesetid_task_fix_setuid), + LSM_HOOK_INIT(capable, safesetid_security_capable) +}; + +static int __init safesetid_security_init(void) +{ + security_add_hooks(safesetid_security_hooks, + ARRAY_SIZE(safesetid_security_hooks), "safesetid"); + + /* Report that SafeSetID successfully initialized */ + safesetid_initialized = 1; + + return 0; +} + +DEFINE_LSM(safesetid_security_init) = { + .init = safesetid_security_init, + .name = "safesetid", +}; diff --git a/security/safesetid/lsm.h b/security/safesetid/lsm.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SafeSetID Linux Security Module + * + * Author: Micah Morton <mortonm@chromium.org> + * + * Copyright (C) 2018 The Chromium OS Authors. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#ifndef _SAFESETID_H +#define _SAFESETID_H + +#include <linux/types.h> + +/* Flag indicating whether initialization completed */ +extern int safesetid_initialized; + +/* Function type. */ +enum safesetid_whitelist_file_write_type { + SAFESETID_WHITELIST_ADD, /* Add whitelist policy. */ + SAFESETID_WHITELIST_FLUSH, /* Flush whitelist policies. */ +}; + +/* Add entry to safesetid whitelist to allow 'parent' to setid to 'child'. */ +int add_safesetid_whitelist_entry(kuid_t parent, kuid_t child); + +void flush_safesetid_whitelist_entries(void); + +#endif /* _SAFESETID_H */ diff --git a/security/safesetid/securityfs.c b/security/safesetid/securityfs.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SafeSetID Linux Security Module + * + * Author: Micah Morton <mortonm@chromium.org> + * + * Copyright (C) 2018 The Chromium OS Authors. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#include <linux/security.h> +#include <linux/cred.h> + +#include "lsm.h" + +static struct dentry *safesetid_policy_dir; + +struct safesetid_file_entry { + const char *name; + enum safesetid_whitelist_file_write_type type; + struct dentry *dentry; +}; + +static struct safesetid_file_entry safesetid_files[] = { + {.name = "add_whitelist_policy", + .type = SAFESETID_WHITELIST_ADD}, + {.name = "flush_whitelist_policies", + .type = SAFESETID_WHITELIST_FLUSH}, +}; + +/* + * In the case the input buffer contains one or more invalid UIDs, the kuid_t + * variables pointed to by 'parent' and 'child' will get updated but this + * function will return an error. + */ +static int parse_safesetid_whitelist_policy(const char __user *buf, + size_t len, + kuid_t *parent, + kuid_t *child) +{ + char *kern_buf; + char *parent_buf; + char *child_buf; + const char separator[] = ":"; + int ret; + size_t first_substring_length; + long parsed_parent; + long parsed_child; + + /* Duplicate string from user memory and NULL-terminate */ + kern_buf = memdup_user_nul(buf, len); + if (IS_ERR(kern_buf)) + return PTR_ERR(kern_buf); + + /* + * Format of |buf| string should be <UID>:<UID>. + * Find location of ":" in kern_buf (copied from |buf|). + */ + first_substring_length = strcspn(kern_buf, separator); + if (first_substring_length == 0 || first_substring_length == len) { + ret = -EINVAL; + goto free_kern; + } + + parent_buf = kmemdup_nul(kern_buf, first_substring_length, GFP_KERNEL); + if (!parent_buf) { + ret = -ENOMEM; + goto free_kern; + } + + ret = kstrtol(parent_buf, 0, &parsed_parent); + if (ret) + goto free_both; + + child_buf = kern_buf + first_substring_length + 1; + ret = kstrtol(child_buf, 0, &parsed_child); + if (ret) + goto free_both; + + *parent = make_kuid(current_user_ns(), parsed_parent); + if (!uid_valid(*parent)) { + ret = -EINVAL; + goto free_both; + } + + *child = make_kuid(current_user_ns(), parsed_child); + if (!uid_valid(*child)) { + ret = -EINVAL; + goto free_both; + } + +free_both: + kfree(parent_buf); +free_kern: + kfree(kern_buf); + return ret; +} + +static ssize_t safesetid_file_write(struct file *file, + const char __user *buf, + size_t len, + loff_t *ppos) +{ + struct safesetid_file_entry *file_entry = + file->f_inode->i_private; + kuid_t parent; + kuid_t child; + int ret; + + if (!ns_capable(current_user_ns(), CAP_MAC_ADMIN)) + return -EPERM; + + if (*ppos != 0) + return -EINVAL; + + switch (file_entry->type) { + case SAFESETID_WHITELIST_FLUSH: + flush_safesetid_whitelist_entries(); + break; + case SAFESETID_WHITELIST_ADD: + ret = parse_safesetid_whitelist_policy(buf, len, &parent, + &child); + if (ret) + return ret; + + ret = add_safesetid_whitelist_entry(parent, child); + if (ret) + return ret; + break; + default: + pr_warn("Unknown securityfs file %d\n", file_entry->type); + break; + } + + /* Return len on success so caller won't keep trying to write */ + return len; +} + +static const struct file_operations safesetid_file_fops = { + .write = safesetid_file_write, +}; + +static void safesetid_shutdown_securityfs(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(safesetid_files); ++i) { + struct safesetid_file_entry *entry = + &safesetid_files[i]; + securityfs_remove(entry->dentry); + entry->dentry = NULL; + } + + securityfs_remove(safesetid_policy_dir); + safesetid_policy_dir = NULL; +} + +static int __init safesetid_init_securityfs(void) +{ + int i; + int ret; + + if (!safesetid_initialized) + return 0; + + safesetid_policy_dir = securityfs_create_dir("safesetid", NULL); + if (IS_ERR(safesetid_policy_dir)) { + ret = PTR_ERR(safesetid_policy_dir); + goto error; + } + + for (i = 0; i < ARRAY_SIZE(safesetid_files); ++i) { + struct safesetid_file_entry *entry = + &safesetid_files[i]; + entry->dentry = securityfs_create_file( + entry->name, 0200, safesetid_policy_dir, + entry, &safesetid_file_fops); + if (IS_ERR(entry->dentry)) { + ret = PTR_ERR(entry->dentry); + goto error; + } + } + + return 0; + +error: + safesetid_shutdown_securityfs(); + return ret; +} +fs_initcall(safesetid_init_securityfs); diff --git a/security/security.c b/security/security.c @@ -30,20 +30,32 @@ #include <linux/personality.h> #include <linux/backing-dev.h> #include <linux/string.h> +#include <linux/msg.h> #include <net/flow.h> #define MAX_LSM_EVM_XATTR 2 -/* Maximum number of letters for an LSM name string */ -#define SECURITY_NAME_MAX 10 +/* How many LSMs were built into the kernel? */ +#define LSM_COUNT (__end_lsm_info - __start_lsm_info) struct security_hook_heads security_hook_heads __lsm_ro_after_init; static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain); +static struct kmem_cache *lsm_file_cache; +static struct kmem_cache *lsm_inode_cache; + char *lsm_names; +static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init; + /* Boot-time LSM user choice */ -static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = - CONFIG_DEFAULT_SECURITY; +static __initdata const char *chosen_lsm_order; +static __initdata const char *chosen_major_lsm; + +static __initconst const char * const builtin_lsm_order = CONFIG_LSM; + +/* Ordered list of LSMs to initialize. */ +static __initdata struct lsm_info **ordered_lsms; +static __initdata struct lsm_info *exclusive; static __initdata bool debug; #define init_debug(...) \ @@ -52,18 +64,269 @@ static __initdata bool debug; pr_info(__VA_ARGS__); \ } while (0) -static void __init major_lsm_init(void) +static bool __init is_enabled(struct lsm_info *lsm) { - struct lsm_info *lsm; - int ret; + if (!lsm->enabled) + return false; + + return *lsm->enabled; +} + +/* Mark an LSM's enabled flag. */ +static int lsm_enabled_true __initdata = 1; +static int lsm_enabled_false __initdata = 0; +static void __init set_enabled(struct lsm_info *lsm, bool enabled) +{ + /* + * When an LSM hasn't configured an enable variable, we can use + * a hard-coded location for storing the default enabled state. + */ + if (!lsm->enabled) { + if (enabled) + lsm->enabled = &lsm_enabled_true; + else + lsm->enabled = &lsm_enabled_false; + } else if (lsm->enabled == &lsm_enabled_true) { + if (!enabled) + lsm->enabled = &lsm_enabled_false; + } else if (lsm->enabled == &lsm_enabled_false) { + if (enabled) + lsm->enabled = &lsm_enabled_true; + } else { + *lsm->enabled = enabled; + } +} + +/* Is an LSM already listed in the ordered LSMs list? */ +static bool __init exists_ordered_lsm(struct lsm_info *lsm) +{ + struct lsm_info **check; + + for (check = ordered_lsms; *check; check++) + if (*check == lsm) + return true; + + return false; +} + +/* Append an LSM to the list of ordered LSMs to initialize. */ +static int last_lsm __initdata; +static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from) +{ + /* Ignore duplicate selections. */ + if (exists_ordered_lsm(lsm)) + return; + + if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from)) + return; + + /* Enable this LSM, if it is not already set. */ + if (!lsm->enabled) + lsm->enabled = &lsm_enabled_true; + ordered_lsms[last_lsm++] = lsm; + + init_debug("%s ordering: %s (%sabled)\n", from, lsm->name, + is_enabled(lsm) ? "en" : "dis"); +} + +/* Is an LSM allowed to be initialized? */ +static bool __init lsm_allowed(struct lsm_info *lsm) +{ + /* Skip if the LSM is disabled. */ + if (!is_enabled(lsm)) + return false; + + /* Not allowed if another exclusive LSM already initialized. */ + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) { + init_debug("exclusive disabled: %s\n", lsm->name); + return false; + } + + return true; +} + +static void __init lsm_set_blob_size(int *need, int *lbs) +{ + int offset; + + if (*need > 0) { + offset = *lbs; + *lbs += *need; + *need = offset; + } +} + +static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed) +{ + if (!needed) + return; + + lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred); + lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file); + /* + * The inode blob gets an rcu_head in addition to + * what the modules might need. + */ + if (needed->lbs_inode && blob_sizes.lbs_inode == 0) + blob_sizes.lbs_inode = sizeof(struct rcu_head); + lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode); + lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc); + lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg); + lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task); +} + +/* Prepare LSM for initialization. */ +static void __init prepare_lsm(struct lsm_info *lsm) +{ + int enabled = lsm_allowed(lsm); + + /* Record enablement (to handle any following exclusive LSMs). */ + set_enabled(lsm, enabled); + + /* If enabled, do pre-initialization work. */ + if (enabled) { + if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) { + exclusive = lsm; + init_debug("exclusive chosen: %s\n", lsm->name); + } + + lsm_set_blob_sizes(lsm->blobs); + } +} + +/* Initialize a given LSM, if it is enabled. */ +static void __init initialize_lsm(struct lsm_info *lsm) +{ + if (is_enabled(lsm)) { + int ret; - for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { init_debug("initializing %s\n", lsm->name); ret = lsm->init(); WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret); } } +/* Populate ordered LSMs list from comma-separated LSM name list. */ +static void __init ordered_lsm_parse(const char *order, const char *origin) +{ + struct lsm_info *lsm; + char *sep, *name, *next; + + /* LSM_ORDER_FIRST is always first. */ + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (lsm->order == LSM_ORDER_FIRST) + append_ordered_lsm(lsm, "first"); + } + + /* Process "security=", if given. */ + if (chosen_major_lsm) { + struct lsm_info *major; + + /* + * To match the original "security=" behavior, this + * explicitly does NOT fallback to another Legacy Major + * if the selected one was separately disabled: disable + * all non-matching Legacy Major LSMs. + */ + for (major = __start_lsm_info; major < __end_lsm_info; + major++) { + if ((major->flags & LSM_FLAG_LEGACY_MAJOR) && + strcmp(major->name, chosen_major_lsm) != 0) { + set_enabled(major, false); + init_debug("security=%s disabled: %s\n", + chosen_major_lsm, major->name); + } + } + } + + sep = kstrdup(order, GFP_KERNEL); + next = sep; + /* Walk the list, looking for matching LSMs. */ + while ((name = strsep(&next, ",")) != NULL) { + bool found = false; + + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (lsm->order == LSM_ORDER_MUTABLE && + strcmp(lsm->name, name) == 0) { + append_ordered_lsm(lsm, origin); + found = true; + } + } + + if (!found) + init_debug("%s ignored: %s\n", origin, name); + } + + /* Process "security=", if given. */ + if (chosen_major_lsm) { + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (exists_ordered_lsm(lsm)) + continue; + if (strcmp(lsm->name, chosen_major_lsm) == 0) + append_ordered_lsm(lsm, "security="); + } + } + + /* Disable all LSMs not in the ordered list. */ + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + if (exists_ordered_lsm(lsm)) + continue; + set_enabled(lsm, false); + init_debug("%s disabled: %s\n", origin, lsm->name); + } + + kfree(sep); +} + +static void __init lsm_early_cred(struct cred *cred); +static void __init lsm_early_task(struct task_struct *task); + +static void __init ordered_lsm_init(void) +{ + struct lsm_info **lsm; + + ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms), + GFP_KERNEL); + + if (chosen_lsm_order) { + if (chosen_major_lsm) { + pr_info("security= is ignored because it is superseded by lsm=\n"); + chosen_major_lsm = NULL; + } + ordered_lsm_parse(chosen_lsm_order, "cmdline"); + } else + ordered_lsm_parse(builtin_lsm_order, "builtin"); + + for (lsm = ordered_lsms; *lsm; lsm++) + prepare_lsm(*lsm); + + init_debug("cred blob size = %d\n", blob_sizes.lbs_cred); + init_debug("file blob size = %d\n", blob_sizes.lbs_file); + init_debug("inode blob size = %d\n", blob_sizes.lbs_inode); + init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc); + init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg); + init_debug("task blob size = %d\n", blob_sizes.lbs_task); + + /* + * Create any kmem_caches needed for blobs + */ + if (blob_sizes.lbs_file) + lsm_file_cache = kmem_cache_create("lsm_file_cache", + blob_sizes.lbs_file, 0, + SLAB_PANIC, NULL); + if (blob_sizes.lbs_inode) + lsm_inode_cache = kmem_cache_create("lsm_inode_cache", + blob_sizes.lbs_inode, 0, + SLAB_PANIC, NULL); + + lsm_early_cred((struct cred *) current->cred); + lsm_early_task(current); + for (lsm = ordered_lsms; *lsm; lsm++) + initialize_lsm(*lsm); + + kfree(ordered_lsms); +} + /** * security_init - initializes the security framework * @@ -80,28 +343,27 @@ int __init security_init(void) i++) INIT_HLIST_HEAD(&list[i]); - /* - * Load minor LSMs, with the capability module always first. - */ - capability_add_hooks(); - yama_add_hooks(); - loadpin_add_hooks(); - - /* - * Load all the remaining security modules. - */ - major_lsm_init(); + /* Load LSMs in specified order. */ + ordered_lsm_init(); return 0; } /* Save user chosen LSM */ -static int __init choose_lsm(char *str) +static int __init choose_major_lsm(char *str) +{ + chosen_major_lsm = str; + return 1; +} +__setup("security=", choose_major_lsm); + +/* Explicitly choose LSM initialization order. */ +static int __init choose_lsm_order(char *str) { - strncpy(chosen_lsm, str, SECURITY_NAME_MAX); + chosen_lsm_order = str; return 1; } -__setup("security=", choose_lsm); +__setup("lsm=", choose_lsm_order); /* Enable LSM order debugging. */ static int __init enable_debug(char *str) @@ -148,29 +410,6 @@ static int lsm_append(char *new, char **result) } /** - * security_module_enable - Load given security module on boot ? - * @module: the name of the module - * - * Each LSM must pass this method before registering its own operations - * to avoid security registration races. This method may also be used - * to check if your LSM is currently loaded during kernel initialization. - * - * Returns: - * - * true if: - * - * - The passed LSM is the one chosen by user at boot time, - * - or the passed LSM is configured as the default and the user did not - * choose an alternate LSM at boot time. - * - * Otherwise, return false. - */ -int __init security_module_enable(const char *module) -{ - return !strcmp(module, chosen_lsm); -} - -/** * security_add_hooks - Add a modules hooks to the hook lists. * @hooks: the hooks to add * @count: the number of hooks to add @@ -209,6 +448,161 @@ int unregister_lsm_notifier(struct notifier_block *nb) } EXPORT_SYMBOL(unregister_lsm_notifier); +/** + * lsm_cred_alloc - allocate a composite cred blob + * @cred: the cred that needs a blob + * @gfp: allocation type + * + * Allocate the cred blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_cred_alloc(struct cred *cred, gfp_t gfp) +{ + if (blob_sizes.lbs_cred == 0) { + cred->security = NULL; + return 0; + } + + cred->security = kzalloc(blob_sizes.lbs_cred, gfp); + if (cred->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_early_cred - during initialization allocate a composite cred blob + * @cred: the cred that needs a blob + * + * Allocate the cred blob for all the modules + */ +static void __init lsm_early_cred(struct cred *cred) +{ + int rc = lsm_cred_alloc(cred, GFP_KERNEL); + + if (rc) + panic("%s: Early cred alloc failed.\n", __func__); +} + +/** + * lsm_file_alloc - allocate a composite file blob + * @file: the file that needs a blob + * + * Allocate the file blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_file_alloc(struct file *file) +{ + if (!lsm_file_cache) { + file->f_security = NULL; + return 0; + } + + file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL); + if (file->f_security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_inode_alloc - allocate a composite inode blob + * @inode: the inode that needs a blob + * + * Allocate the inode blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +int lsm_inode_alloc(struct inode *inode) +{ + if (!lsm_inode_cache) { + inode->i_security = NULL; + return 0; + } + + inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS); + if (inode->i_security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_task_alloc - allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_task_alloc(struct task_struct *task) +{ + if (blob_sizes.lbs_task == 0) { + task->security = NULL; + return 0; + } + + task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL); + if (task->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_ipc_alloc - allocate a composite ipc blob + * @kip: the ipc that needs a blob + * + * Allocate the ipc blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_ipc_alloc(struct kern_ipc_perm *kip) +{ + if (blob_sizes.lbs_ipc == 0) { + kip->security = NULL; + return 0; + } + + kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL); + if (kip->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_msg_msg_alloc - allocate a composite msg_msg blob + * @mp: the msg_msg that needs a blob + * + * Allocate the ipc blob for all the modules + * + * Returns 0, or -ENOMEM if memory can't be allocated. + */ +static int lsm_msg_msg_alloc(struct msg_msg *mp) +{ + if (blob_sizes.lbs_msg_msg == 0) { + mp->security = NULL; + return 0; + } + + mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL); + if (mp->security == NULL) + return -ENOMEM; + return 0; +} + +/** + * lsm_early_task - during initialization allocate a composite task blob + * @task: the task that needs a blob + * + * Allocate the task blob for all the modules + */ +static void __init lsm_early_task(struct task_struct *task) +{ + int rc = lsm_task_alloc(task); + + if (rc) + panic("%s: Early task alloc failed.\n", __func__); +} + /* * Hook list operation macros. * @@ -294,16 +688,12 @@ int security_capset(struct cred *new, const struct cred *old, effective, inheritable, permitted); } -int security_capable(const struct cred *cred, struct user_namespace *ns, - int cap) +int security_capable(const struct cred *cred, + struct user_namespace *ns, + int cap, + unsigned int opts) { - return call_int_hook(capable, 0, cred, ns, cap, SECURITY_CAP_AUDIT); -} - -int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns, - int cap) -{ - return call_int_hook(capable, 0, cred, ns, cap, SECURITY_CAP_NOAUDIT); + return call_int_hook(capable, 0, cred, ns, cap, opts); } int security_quotactl(int cmds, int type, int id, struct super_block *sb) @@ -468,14 +858,40 @@ EXPORT_SYMBOL(security_add_mnt_opt); int security_inode_alloc(struct inode *inode) { - inode->i_security = NULL; - return call_int_hook(inode_alloc_security, 0, inode); + int rc = lsm_inode_alloc(inode); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(inode_alloc_security, 0, inode); + if (unlikely(rc)) + security_inode_free(inode); + return rc; +} + +static void inode_free_by_rcu(struct rcu_head *head) +{ + /* + * The rcu head is at the start of the inode blob + */ + kmem_cache_free(lsm_inode_cache, head); } void security_inode_free(struct inode *inode) { integrity_inode_free(inode); call_void_hook(inode_free_security, inode); + /* + * The inode may still be referenced in a path walk and + * a call to security_inode_permission() can be made + * after inode_free_security() is called. Ideally, the VFS + * wouldn't do this, but fixing that is a much harder + * job. For now, simply free the i_security via RCU, and + * leave the current inode->i_security pointer intact. + * The inode will be freed after the RCU grace period too. + */ + if (inode->i_security) + call_rcu((struct rcu_head *)inode->i_security, + inode_free_by_rcu); } int security_dentry_init_security(struct dentry *dentry, int mode, @@ -905,12 +1321,27 @@ int security_file_permission(struct file *file, int mask) int security_file_alloc(struct file *file) { - return call_int_hook(file_alloc_security, 0, file); + int rc = lsm_file_alloc(file); + + if (rc) + return rc; + rc = call_int_hook(file_alloc_security, 0, file); + if (unlikely(rc)) + security_file_free(file); + return rc; } void security_file_free(struct file *file) { + void *blob; + call_void_hook(file_free_security, file); + + blob = file->f_security; + if (blob) { + file->f_security = NULL; + kmem_cache_free(lsm_file_cache, blob); + } } int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) @@ -1012,17 +1443,35 @@ int security_file_open(struct file *file) int security_task_alloc(struct task_struct *task, unsigned long clone_flags) { - return call_int_hook(task_alloc, 0, task, clone_flags); + int rc = lsm_task_alloc(task); + + if (rc) + return rc; + rc = call_int_hook(task_alloc, 0, task, clone_flags); + if (unlikely(rc)) + security_task_free(task); + return rc; } void security_task_free(struct task_struct *task) { call_void_hook(task_free, task); + + kfree(task->security); + task->security = NULL; } int security_cred_alloc_blank(struct cred *cred, gfp_t gfp) { - return call_int_hook(cred_alloc_blank, 0, cred, gfp); + int rc = lsm_cred_alloc(cred, gfp); + + if (rc) + return rc; + + rc = call_int_hook(cred_alloc_blank, 0, cred, gfp); + if (unlikely(rc)) + security_cred_free(cred); + return rc; } void security_cred_free(struct cred *cred) @@ -1035,11 +1484,22 @@ void security_cred_free(struct cred *cred) return; call_void_hook(cred_free, cred); + + kfree(cred->security); + cred->security = NULL; } int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp) { - return call_int_hook(cred_prepare, 0, new, old, gfp); + int rc = lsm_cred_alloc(new, gfp); + + if (rc) + return rc; + + rc = call_int_hook(cred_prepare, 0, new, old, gfp); + if (unlikely(rc)) + security_cred_free(new); + return rc; } void security_transfer_creds(struct cred *new, const struct cred *old) @@ -1220,22 +1680,40 @@ void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) int security_msg_msg_alloc(struct msg_msg *msg) { - return call_int_hook(msg_msg_alloc_security, 0, msg); + int rc = lsm_msg_msg_alloc(msg); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(msg_msg_alloc_security, 0, msg); + if (unlikely(rc)) + security_msg_msg_free(msg); + return rc; } void security_msg_msg_free(struct msg_msg *msg) { call_void_hook(msg_msg_free_security, msg); + kfree(msg->security); + msg->security = NULL; } int security_msg_queue_alloc(struct kern_ipc_perm *msq) { - return call_int_hook(msg_queue_alloc_security, 0, msq); + int rc = lsm_ipc_alloc(msq); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(msg_queue_alloc_security, 0, msq); + if (unlikely(rc)) + security_msg_queue_free(msq); + return rc; } void security_msg_queue_free(struct kern_ipc_perm *msq) { call_void_hook(msg_queue_free_security, msq); + kfree(msq->security); + msq->security = NULL; } int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) @@ -1262,12 +1740,21 @@ int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg, int security_shm_alloc(struct kern_ipc_perm *shp) { - return call_int_hook(shm_alloc_security, 0, shp); + int rc = lsm_ipc_alloc(shp); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(shm_alloc_security, 0, shp); + if (unlikely(rc)) + security_shm_free(shp); + return rc; } void security_shm_free(struct kern_ipc_perm *shp) { call_void_hook(shm_free_security, shp); + kfree(shp->security); + shp->security = NULL; } int security_shm_associate(struct kern_ipc_perm *shp, int shmflg) @@ -1287,12 +1774,21 @@ int security_shm_shmat(struct kern_ipc_perm *shp, char __user *shmaddr, int shmf int security_sem_alloc(struct kern_ipc_perm *sma) { - return call_int_hook(sem_alloc_security, 0, sma); + int rc = lsm_ipc_alloc(sma); + + if (unlikely(rc)) + return rc; + rc = call_int_hook(sem_alloc_security, 0, sma); + if (unlikely(rc)) + security_sem_free(sma); + return rc; } void security_sem_free(struct kern_ipc_perm *sma) { call_void_hook(sem_free_security, sma); + kfree(sma->security); + sma->security = NULL; } int security_sem_associate(struct kern_ipc_perm *sma, int semflg) @@ -1319,14 +1815,30 @@ void security_d_instantiate(struct dentry *dentry, struct inode *inode) } EXPORT_SYMBOL(security_d_instantiate); -int security_getprocattr(struct task_struct *p, char *name, char **value) +int security_getprocattr(struct task_struct *p, const char *lsm, char *name, + char **value) { - return call_int_hook(getprocattr, -EINVAL, p, name, value); + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { + if (lsm != NULL && strcmp(lsm, hp->lsm)) + continue; + return hp->hook.getprocattr(p, name, value); + } + return -EINVAL; } -int security_setprocattr(const char *name, void *value, size_t size) +int security_setprocattr(const char *lsm, const char *name, void *value, + size_t size) { - return call_int_hook(setprocattr, -EINVAL, name, value, size); + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { + if (lsm != NULL && strcmp(lsm, hp->lsm)) + continue; + return hp->hook.setprocattr(name, value, size); + } + return -EINVAL; } int security_netlink_send(struct sock *sk, struct sk_buff *skb) diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig @@ -22,21 +22,6 @@ config SECURITY_SELINUX_BOOTPARAM If you are unsure how to answer this question, answer N. -config SECURITY_SELINUX_BOOTPARAM_VALUE - int "NSA SELinux boot parameter default value" - depends on SECURITY_SELINUX_BOOTPARAM - range 0 1 - default 1 - help - This option sets the default value for the kernel parameter - 'selinux', which allows SELinux to be disabled at boot. If this - option is set to 0 (zero), the SELinux kernel parameter will - default to 0, disabling SELinux at bootup. If this option is - set to 1 (one), the SELinux kernel parameter will default to 1, - enabling SELinux at bootup. - - If you are unsure how to answer this question, answer 1. - config SECURITY_SELINUX_DISABLE bool "NSA SELinux runtime disable" depends on SECURITY_SELINUX diff --git a/security/selinux/Makefile b/security/selinux/Makefile @@ -6,7 +6,7 @@ obj-$(CONFIG_SECURITY_SELINUX) := selinux.o selinux-y := avc.o hooks.o selinuxfs.o netlink.o nlmsgtab.o netif.o \ - netnode.o netport.o ibpkey.o exports.o \ + netnode.o netport.o ibpkey.o \ ss/ebitmap.o ss/hashtab.o ss/symtab.o ss/sidtab.o ss/avtab.o \ ss/policydb.o ss/services.o ss/conditional.o ss/mls.o ss/status.o diff --git a/security/selinux/exports.c b/security/selinux/exports.c @@ -1,23 +0,0 @@ -/* - * SELinux services exported to the rest of the kernel. - * - * Author: James Morris <jmorris@redhat.com> - * - * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com> - * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> - * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2, - * as published by the Free Software Foundation. - */ -#include <linux/module.h> -#include <linux/selinux.h> - -#include "security.h" - -bool selinux_is_enabled(void) -{ - return selinux_enabled; -} -EXPORT_SYMBOL_GPL(selinux_is_enabled); diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c @@ -79,7 +79,6 @@ #include <linux/personality.h> #include <linux/audit.h> #include <linux/string.h> -#include <linux/selinux.h> #include <linux/mutex.h> #include <linux/posix-timers.h> #include <linux/syslog.h> @@ -121,9 +120,8 @@ __setup("enforcing=", enforcing_setup); #define selinux_enforcing_boot 1 #endif +int selinux_enabled __lsm_ro_after_init = 1; #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM -int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; - static int __init selinux_enabled_setup(char *str) { unsigned long enabled; @@ -132,8 +130,6 @@ static int __init selinux_enabled_setup(char *str) return 1; } __setup("selinux=", selinux_enabled_setup); -#else -int selinux_enabled = 1; #endif static unsigned int selinux_checkreqprot_boot = @@ -149,9 +145,6 @@ static int __init checkreqprot_setup(char *str) } __setup("checkreqprot=", checkreqprot_setup); -static struct kmem_cache *sel_inode_cache; -static struct kmem_cache *file_security_cache; - /** * selinux_secmark_enabled - Check to see if SECMARK is currently enabled * @@ -214,12 +207,8 @@ static void cred_init_security(void) struct cred *cred = (struct cred *) current->real_cred; struct task_security_struct *tsec; - tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); - if (!tsec) - panic("SELinux: Failed to initialize initial task.\n"); - + tsec = selinux_cred(cred); tsec->osid = tsec->sid = SECINITSID_KERNEL; - cred->security = tsec; } /* @@ -229,7 +218,7 @@ static inline u32 cred_sid(const struct cred *cred) { const struct task_security_struct *tsec; - tsec = cred->security; + tsec = selinux_cred(cred); return tsec->sid; } @@ -250,13 +239,9 @@ static inline u32 task_sid(const struct task_struct *task) static int inode_alloc_security(struct inode *inode) { - struct inode_security_struct *isec; + struct inode_security_struct *isec = selinux_inode(inode); u32 sid = current_sid(); - isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); - if (!isec) - return -ENOMEM; - spin_lock_init(&isec->lock); INIT_LIST_HEAD(&isec->list); isec->inode = inode; @@ -264,7 +249,6 @@ static int inode_alloc_security(struct inode *inode) isec->sclass = SECCLASS_FILE; isec->task_sid = sid; isec->initialized = LABEL_INVALID; - inode->i_security = isec; return 0; } @@ -281,7 +265,7 @@ static int __inode_security_revalidate(struct inode *inode, struct dentry *dentry, bool may_sleep) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); might_sleep_if(may_sleep); @@ -302,7 +286,7 @@ static int __inode_security_revalidate(struct inode *inode, static struct inode_security_struct *inode_security_novalidate(struct inode *inode) { - return inode->i_security; + return selinux_inode(inode); } static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu) @@ -312,7 +296,7 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo error = __inode_security_revalidate(inode, NULL, !rcu); if (error) return ERR_PTR(error); - return inode->i_security; + return selinux_inode(inode); } /* @@ -321,14 +305,14 @@ static struct inode_security_struct *inode_security_rcu(struct inode *inode, boo static struct inode_security_struct *inode_security(struct inode *inode) { __inode_security_revalidate(inode, NULL, true); - return inode->i_security; + return selinux_inode(inode); } static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry) { struct inode *inode = d_backing_inode(dentry); - return inode->i_security; + return selinux_inode(inode); } /* @@ -339,22 +323,17 @@ static struct inode_security_struct *backing_inode_security(struct dentry *dentr struct inode *inode = d_backing_inode(dentry); __inode_security_revalidate(inode, dentry, true); - return inode->i_security; -} - -static void inode_free_rcu(struct rcu_head *head) -{ - struct inode_security_struct *isec; - - isec = container_of(head, struct inode_security_struct, rcu); - kmem_cache_free(sel_inode_cache, isec); + return selinux_inode(inode); } static void inode_free_security(struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; - struct superblock_security_struct *sbsec = inode->i_sb->s_security; + struct inode_security_struct *isec = selinux_inode(inode); + struct superblock_security_struct *sbsec; + if (!isec) + return; + sbsec = inode->i_sb->s_security; /* * As not all inode security structures are in a list, we check for * empty list outside of the lock to make sure that we won't waste @@ -370,42 +349,19 @@ static void inode_free_security(struct inode *inode) list_del_init(&isec->list); spin_unlock(&sbsec->isec_lock); } - - /* - * The inode may still be referenced in a path walk and - * a call to selinux_inode_permission() can be made - * after inode_free_security() is called. Ideally, the VFS - * wouldn't do this, but fixing that is a much harder - * job. For now, simply free the i_security via RCU, and - * leave the current inode->i_security pointer intact. - * The inode will be freed after the RCU grace period too. - */ - call_rcu(&isec->rcu, inode_free_rcu); } static int file_alloc_security(struct file *file) { - struct file_security_struct *fsec; + struct file_security_struct *fsec = selinux_file(file); u32 sid = current_sid(); - fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL); - if (!fsec) - return -ENOMEM; - fsec->sid = sid; fsec->fown_sid = sid; - file->f_security = fsec; return 0; } -static void file_free_security(struct file *file) -{ - struct file_security_struct *fsec = file->f_security; - file->f_security = NULL; - kmem_cache_free(file_security_cache, fsec); -} - static int superblock_alloc_security(struct super_block *sb) { struct superblock_security_struct *sbsec; @@ -501,7 +457,7 @@ static int may_context_mount_sb_relabel(u32 sid, struct superblock_security_struct *sbsec, const struct cred *cred) { - const struct task_security_struct *tsec = cred->security; + const struct task_security_struct *tsec = selinux_cred(cred); int rc; rc = avc_has_perm(&selinux_state, @@ -520,7 +476,7 @@ static int may_context_mount_inode_relabel(u32 sid, struct superblock_security_struct *sbsec, const struct cred *cred) { - const struct task_security_struct *tsec = cred->security; + const struct task_security_struct *tsec = selinux_cred(cred); int rc; rc = avc_has_perm(&selinux_state, tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, @@ -1374,7 +1330,7 @@ static int selinux_genfs_get_sid(struct dentry *dentry, static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) { struct superblock_security_struct *sbsec = NULL; - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); u32 task_sid, sid = 0; u16 sclass; struct dentry *dentry; @@ -1621,7 +1577,7 @@ static inline u32 signal_to_av(int sig) /* Check whether a task is allowed to use a capability. */ static int cred_has_capability(const struct cred *cred, - int cap, int audit, bool initns) + int cap, unsigned int opts, bool initns) { struct common_audit_data ad; struct av_decision avd; @@ -1648,7 +1604,7 @@ static int cred_has_capability(const struct cred *cred, rc = avc_has_perm_noaudit(&selinux_state, sid, sid, sclass, av, 0, &avd); - if (audit == SECURITY_CAP_AUDIT) { + if (!(opts & CAP_OPT_NOAUDIT)) { int rc2 = avc_audit(&selinux_state, sid, sid, sclass, av, &avd, rc, &ad, 0); if (rc2) @@ -1674,7 +1630,7 @@ static int inode_has_perm(const struct cred *cred, return 0; sid = cred_sid(cred); - isec = inode->i_security; + isec = selinux_inode(inode); return avc_has_perm(&selinux_state, sid, isec->sid, isec->sclass, perms, adp); @@ -1740,7 +1696,7 @@ static int file_has_perm(const struct cred *cred, struct file *file, u32 av) { - struct file_security_struct *fsec = file->f_security; + struct file_security_struct *fsec = selinux_file(file); struct inode *inode = file_inode(file); struct common_audit_data ad; u32 sid = cred_sid(cred); @@ -1806,7 +1762,7 @@ static int may_create(struct inode *dir, struct dentry *dentry, u16 tclass) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct inode_security_struct *dsec; struct superblock_security_struct *sbsec; u32 sid, newsid; @@ -1828,7 +1784,7 @@ static int may_create(struct inode *dir, if (rc) return rc; - rc = selinux_determine_inode_label(current_security(), dir, + rc = selinux_determine_inode_label(selinux_cred(current_cred()), dir, &dentry->d_name, tclass, &newsid); if (rc) return rc; @@ -2084,7 +2040,7 @@ static int selinux_binder_transfer_file(struct task_struct *from, struct file *file) { u32 sid = task_sid(to); - struct file_security_struct *fsec = file->f_security; + struct file_security_struct *fsec = selinux_file(file); struct dentry *dentry = file->f_path.dentry; struct inode_security_struct *isec; struct common_audit_data ad; @@ -2168,9 +2124,9 @@ static int selinux_capset(struct cred *new, const struct cred *old, */ static int selinux_capable(const struct cred *cred, struct user_namespace *ns, - int cap, int audit) + int cap, unsigned int opts) { - return cred_has_capability(cred, cap, audit, ns == &init_user_ns); + return cred_has_capability(cred, cap, opts, ns == &init_user_ns); } static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) @@ -2244,7 +2200,7 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) int rc, cap_sys_admin = 0; rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN, - SECURITY_CAP_NOAUDIT, true); + CAP_OPT_NOAUDIT, true); if (rc == 0) cap_sys_admin = 1; @@ -2335,8 +2291,8 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm) if (bprm->called_set_creds) return 0; - old_tsec = current_security(); - new_tsec = bprm->cred->security; + old_tsec = selinux_cred(current_cred()); + new_tsec = selinux_cred(bprm->cred); isec = inode_security(inode); /* Default to the current task SID. */ @@ -2500,7 +2456,7 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm) struct rlimit *rlim, *initrlim; int rc, i; - new_tsec = bprm->cred->security; + new_tsec = selinux_cred(bprm->cred); if (new_tsec->sid == new_tsec->osid) return; @@ -2543,7 +2499,7 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm) */ static void selinux_bprm_committed_creds(struct linux_binprm *bprm) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct itimerval itimer; u32 osid, sid; int rc, i; @@ -2780,7 +2736,7 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode, u32 newsid; int rc; - rc = selinux_determine_inode_label(current_security(), + rc = selinux_determine_inode_label(selinux_cred(current_cred()), d_inode(dentry->d_parent), name, inode_mode_to_security_class(mode), &newsid); @@ -2800,14 +2756,14 @@ static int selinux_dentry_create_files_as(struct dentry *dentry, int mode, int rc; struct task_security_struct *tsec; - rc = selinux_determine_inode_label(old->security, + rc = selinux_determine_inode_label(selinux_cred(old), d_inode(dentry->d_parent), name, inode_mode_to_security_class(mode), &newsid); if (rc) return rc; - tsec = new->security; + tsec = selinux_cred(new); tsec->create_sid = newsid; return 0; } @@ -2817,7 +2773,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, const char **name, void **value, size_t *len) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct superblock_security_struct *sbsec; u32 newsid, clen; int rc; @@ -2827,7 +2783,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, newsid = tsec->create_sid; - rc = selinux_determine_inode_label(current_security(), + rc = selinux_determine_inode_label(selinux_cred(current_cred()), dir, qstr, inode_mode_to_security_class(inode->i_mode), &newsid); @@ -2836,7 +2792,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir, /* Possibly defer initialization to selinux_complete_init. */ if (sbsec->flags & SE_SBINITIALIZED) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); isec->sclass = inode_mode_to_security_class(inode->i_mode); isec->sid = newsid; isec->initialized = LABEL_INITIALIZED; @@ -2936,7 +2892,7 @@ static noinline int audit_inode_permission(struct inode *inode, unsigned flags) { struct common_audit_data ad; - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); int rc; ad.type = LSM_AUDIT_DATA_INODE; @@ -3031,11 +2987,11 @@ static int selinux_inode_getattr(const struct path *path) static bool has_cap_mac_admin(bool audit) { const struct cred *cred = current_cred(); - int cap_audit = audit ? SECURITY_CAP_AUDIT : SECURITY_CAP_NOAUDIT; + unsigned int opts = audit ? CAP_OPT_NONE : CAP_OPT_NOAUDIT; - if (cap_capable(cred, &init_user_ns, CAP_MAC_ADMIN, cap_audit)) + if (cap_capable(cred, &init_user_ns, CAP_MAC_ADMIN, opts)) return false; - if (cred_has_capability(cred, CAP_MAC_ADMIN, cap_audit, true)) + if (cred_has_capability(cred, CAP_MAC_ADMIN, opts, true)) return false; return true; } @@ -3289,7 +3245,7 @@ static int selinux_inode_copy_up(struct dentry *src, struct cred **new) return -ENOMEM; } - tsec = new_creds->security; + tsec = selinux_cred(new_creds); /* Get label from overlay inode and set it in create_sid */ selinux_inode_getsecid(d_inode(src), &sid); tsec->create_sid = sid; @@ -3330,7 +3286,7 @@ static int selinux_revalidate_file_permission(struct file *file, int mask) static int selinux_file_permission(struct file *file, int mask) { struct inode *inode = file_inode(file); - struct file_security_struct *fsec = file->f_security; + struct file_security_struct *fsec = selinux_file(file); struct inode_security_struct *isec; u32 sid = current_sid(); @@ -3352,11 +3308,6 @@ static int selinux_file_alloc_security(struct file *file) return file_alloc_security(file); } -static void selinux_file_free_security(struct file *file) -{ - file_free_security(file); -} - /* * Check whether a task has the ioctl permission and cmd * operation to an inode. @@ -3365,7 +3316,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file, u32 requested, u16 cmd) { struct common_audit_data ad; - struct file_security_struct *fsec = file->f_security; + struct file_security_struct *fsec = selinux_file(file); struct inode *inode = file_inode(file); struct inode_security_struct *isec; struct lsm_ioctlop_audit ioctl; @@ -3435,7 +3386,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd, case KDSKBENT: case KDSKBSENT: error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG, - SECURITY_CAP_AUDIT, true); + CAP_OPT_NONE, true); break; /* default case assumes that the command will go @@ -3617,7 +3568,7 @@ static void selinux_file_set_fowner(struct file *file) { struct file_security_struct *fsec; - fsec = file->f_security; + fsec = selinux_file(file); fsec->fown_sid = current_sid(); } @@ -3632,7 +3583,7 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk, /* struct fown_struct is never outside the context of a struct file */ file = container_of(fown, struct file, f_owner); - fsec = file->f_security; + fsec = selinux_file(file); if (!signum) perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ @@ -3656,7 +3607,7 @@ static int selinux_file_open(struct file *file) struct file_security_struct *fsec; struct inode_security_struct *isec; - fsec = file->f_security; + fsec = selinux_file(file); isec = inode_security(file_inode(file)); /* * Save inode label and policy sequence number @@ -3690,52 +3641,15 @@ static int selinux_task_alloc(struct task_struct *task, } /* - * allocate the SELinux part of blank credentials - */ -static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) -{ - struct task_security_struct *tsec; - - tsec = kzalloc(sizeof(struct task_security_struct), gfp); - if (!tsec) - return -ENOMEM; - - cred->security = tsec; - return 0; -} - -/* - * detach and free the LSM part of a set of credentials - */ -static void selinux_cred_free(struct cred *cred) -{ - struct task_security_struct *tsec = cred->security; - - /* - * cred->security == NULL if security_cred_alloc_blank() or - * security_prepare_creds() returned an error. - */ - BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE); - cred->security = (void *) 0x7UL; - kfree(tsec); -} - -/* * prepare a new set of credentials for modification */ static int selinux_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { - const struct task_security_struct *old_tsec; - struct task_security_struct *tsec; - - old_tsec = old->security; + const struct task_security_struct *old_tsec = selinux_cred(old); + struct task_security_struct *tsec = selinux_cred(new); - tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); - if (!tsec) - return -ENOMEM; - - new->security = tsec; + *tsec = *old_tsec; return 0; } @@ -3744,8 +3658,8 @@ static int selinux_cred_prepare(struct cred *new, const struct cred *old, */ static void selinux_cred_transfer(struct cred *new, const struct cred *old) { - const struct task_security_struct *old_tsec = old->security; - struct task_security_struct *tsec = new->security; + const struct task_security_struct *old_tsec = selinux_cred(old); + struct task_security_struct *tsec = selinux_cred(new); *tsec = *old_tsec; } @@ -3761,7 +3675,7 @@ static void selinux_cred_getsecid(const struct cred *c, u32 *secid) */ static int selinux_kernel_act_as(struct cred *new, u32 secid) { - struct task_security_struct *tsec = new->security; + struct task_security_struct *tsec = selinux_cred(new); u32 sid = current_sid(); int ret; @@ -3786,7 +3700,7 @@ static int selinux_kernel_act_as(struct cred *new, u32 secid) static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) { struct inode_security_struct *isec = inode_security(inode); - struct task_security_struct *tsec = new->security; + struct task_security_struct *tsec = selinux_cred(new); u32 sid = current_sid(); int ret; @@ -3832,7 +3746,7 @@ static int selinux_kernel_module_from_file(struct file *file) ad.type = LSM_AUDIT_DATA_FILE; ad.u.file = file; - fsec = file->f_security; + fsec = selinux_file(file); if (sid != fsec->sid) { rc = avc_has_perm(&selinux_state, sid, fsec->sid, SECCLASS_FD, FD__USE, &ad); @@ -3998,7 +3912,7 @@ static int selinux_task_kill(struct task_struct *p, struct kernel_siginfo *info, static void selinux_task_to_inode(struct task_struct *p, struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); u32 sid = task_sid(p); spin_lock(&isec->lock); @@ -4335,7 +4249,7 @@ static int sock_has_perm(struct sock *sk, u32 perms) static int selinux_socket_create(int family, int type, int protocol, int kern) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); u32 newsid; u16 secclass; int rc; @@ -4355,7 +4269,7 @@ static int selinux_socket_create(int family, int type, static int selinux_socket_post_create(struct socket *sock, int family, int type, int protocol, int kern) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock)); struct sk_security_struct *sksec; u16 sclass = socket_type_to_security_class(family, type, protocol); @@ -5236,7 +5150,7 @@ static int selinux_secmark_relabel_packet(u32 sid) const struct task_security_struct *__tsec; u32 tsid; - __tsec = current_security(); + __tsec = selinux_cred(current_cred()); tsid = __tsec->sid; return avc_has_perm(&selinux_state, @@ -5711,51 +5625,22 @@ static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) return selinux_nlmsg_perm(sk, skb); } -static int ipc_alloc_security(struct kern_ipc_perm *perm, - u16 sclass) +static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass) { - struct ipc_security_struct *isec; - - isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); - if (!isec) - return -ENOMEM; - isec->sclass = sclass; isec->sid = current_sid(); - perm->security = isec; - - return 0; -} - -static void ipc_free_security(struct kern_ipc_perm *perm) -{ - struct ipc_security_struct *isec = perm->security; - perm->security = NULL; - kfree(isec); } static int msg_msg_alloc_security(struct msg_msg *msg) { struct msg_security_struct *msec; - msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); - if (!msec) - return -ENOMEM; - + msec = selinux_msg_msg(msg); msec->sid = SECINITSID_UNLABELED; - msg->security = msec; return 0; } -static void msg_msg_free_security(struct msg_msg *msg) -{ - struct msg_security_struct *msec = msg->security; - - msg->security = NULL; - kfree(msec); -} - static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, u32 perms) { @@ -5763,7 +5648,7 @@ static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, struct common_audit_data ad; u32 sid = current_sid(); - isec = ipc_perms->security; + isec = selinux_ipc(ipc_perms); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = ipc_perms->key; @@ -5777,11 +5662,6 @@ static int selinux_msg_msg_alloc_security(struct msg_msg *msg) return msg_msg_alloc_security(msg); } -static void selinux_msg_msg_free_security(struct msg_msg *msg) -{ - msg_msg_free_security(msg); -} - /* message queue security operations */ static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq) { @@ -5790,11 +5670,8 @@ static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq) u32 sid = current_sid(); int rc; - rc = ipc_alloc_security(msq, SECCLASS_MSGQ); - if (rc) - return rc; - - isec = msq->security; + isec = selinux_ipc(msq); + ipc_init_security(isec, SECCLASS_MSGQ); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = msq->key; @@ -5802,16 +5679,7 @@ static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq) rc = avc_has_perm(&selinux_state, sid, isec->sid, SECCLASS_MSGQ, MSGQ__CREATE, &ad); - if (rc) { - ipc_free_security(msq); - return rc; - } - return 0; -} - -static void selinux_msg_queue_free_security(struct kern_ipc_perm *msq) -{ - ipc_free_security(msq); + return rc; } static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) @@ -5820,7 +5688,7 @@ static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg) struct common_audit_data ad; u32 sid = current_sid(); - isec = msq->security; + isec = selinux_ipc(msq); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = msq->key; @@ -5869,8 +5737,8 @@ static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *m u32 sid = current_sid(); int rc; - isec = msq->security; - msec = msg->security; + isec = selinux_ipc(msq); + msec = selinux_msg_msg(msg); /* * First time through, need to assign label to the message @@ -5917,8 +5785,8 @@ static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *m u32 sid = task_sid(target); int rc; - isec = msq->security; - msec = msg->security; + isec = selinux_ipc(msq); + msec = selinux_msg_msg(msg); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = msq->key; @@ -5941,11 +5809,8 @@ static int selinux_shm_alloc_security(struct kern_ipc_perm *shp) u32 sid = current_sid(); int rc; - rc = ipc_alloc_security(shp, SECCLASS_SHM); - if (rc) - return rc; - - isec = shp->security; + isec = selinux_ipc(shp); + ipc_init_security(isec, SECCLASS_SHM); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = shp->key; @@ -5953,16 +5818,7 @@ static int selinux_shm_alloc_security(struct kern_ipc_perm *shp) rc = avc_has_perm(&selinux_state, sid, isec->sid, SECCLASS_SHM, SHM__CREATE, &ad); - if (rc) { - ipc_free_security(shp); - return rc; - } - return 0; -} - -static void selinux_shm_free_security(struct kern_ipc_perm *shp) -{ - ipc_free_security(shp); + return rc; } static int selinux_shm_associate(struct kern_ipc_perm *shp, int shmflg) @@ -5971,7 +5827,7 @@ static int selinux_shm_associate(struct kern_ipc_perm *shp, int shmflg) struct common_audit_data ad; u32 sid = current_sid(); - isec = shp->security; + isec = selinux_ipc(shp); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = shp->key; @@ -6038,11 +5894,8 @@ static int selinux_sem_alloc_security(struct kern_ipc_perm *sma) u32 sid = current_sid(); int rc; - rc = ipc_alloc_security(sma, SECCLASS_SEM); - if (rc) - return rc; - - isec = sma->security; + isec = selinux_ipc(sma); + ipc_init_security(isec, SECCLASS_SEM); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = sma->key; @@ -6050,16 +5903,7 @@ static int selinux_sem_alloc_security(struct kern_ipc_perm *sma) rc = avc_has_perm(&selinux_state, sid, isec->sid, SECCLASS_SEM, SEM__CREATE, &ad); - if (rc) { - ipc_free_security(sma); - return rc; - } - return 0; -} - -static void selinux_sem_free_security(struct kern_ipc_perm *sma) -{ - ipc_free_security(sma); + return rc; } static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg) @@ -6068,7 +5912,7 @@ static int selinux_sem_associate(struct kern_ipc_perm *sma, int semflg) struct common_audit_data ad; u32 sid = current_sid(); - isec = sma->security; + isec = selinux_ipc(sma); ad.type = LSM_AUDIT_DATA_IPC; ad.u.ipc_id = sma->key; @@ -6154,7 +5998,7 @@ static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) { - struct ipc_security_struct *isec = ipcp->security; + struct ipc_security_struct *isec = selinux_ipc(ipcp); *secid = isec->sid; } @@ -6173,7 +6017,7 @@ static int selinux_getprocattr(struct task_struct *p, unsigned len; rcu_read_lock(); - __tsec = __task_cred(p)->security; + __tsec = selinux_cred(__task_cred(p)); if (current != p) { error = avc_has_perm(&selinux_state, @@ -6296,7 +6140,7 @@ static int selinux_setprocattr(const char *name, void *value, size_t size) operation. See selinux_bprm_set_creds for the execve checks and may_create for the file creation checks. The operation will then fail if the context is not permitted. */ - tsec = new->security; + tsec = selinux_cred(new); if (!strcmp(name, "exec")) { tsec->exec_sid = sid; } else if (!strcmp(name, "fscreate")) { @@ -6380,7 +6224,7 @@ static void selinux_release_secctx(char *secdata, u32 seclen) static void selinux_inode_invalidate_secctx(struct inode *inode) { - struct inode_security_struct *isec = inode->i_security; + struct inode_security_struct *isec = selinux_inode(inode); spin_lock(&isec->lock); isec->initialized = LABEL_INVALID; @@ -6425,7 +6269,7 @@ static int selinux_key_alloc(struct key *k, const struct cred *cred, if (!ksec) return -ENOMEM; - tsec = cred->security; + tsec = selinux_cred(cred); if (tsec->keycreate_sid) ksec->sid = tsec->keycreate_sid; else @@ -6688,6 +6532,14 @@ static void selinux_bpf_prog_free(struct bpf_prog_aux *aux) } #endif +struct lsm_blob_sizes selinux_blob_sizes __lsm_ro_after_init = { + .lbs_cred = sizeof(struct task_security_struct), + .lbs_file = sizeof(struct file_security_struct), + .lbs_inode = sizeof(struct inode_security_struct), + .lbs_ipc = sizeof(struct ipc_security_struct), + .lbs_msg_msg = sizeof(struct msg_security_struct), +}; + static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr), LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction), @@ -6757,7 +6609,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(file_permission, selinux_file_permission), LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security), - LSM_HOOK_INIT(file_free_security, selinux_file_free_security), LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl), LSM_HOOK_INIT(mmap_file, selinux_mmap_file), LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr), @@ -6771,8 +6622,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(file_open, selinux_file_open), LSM_HOOK_INIT(task_alloc, selinux_task_alloc), - LSM_HOOK_INIT(cred_alloc_blank, selinux_cred_alloc_blank), - LSM_HOOK_INIT(cred_free, selinux_cred_free), LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare), LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer), LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid), @@ -6800,24 +6649,20 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid), LSM_HOOK_INIT(msg_msg_alloc_security, selinux_msg_msg_alloc_security), - LSM_HOOK_INIT(msg_msg_free_security, selinux_msg_msg_free_security), LSM_HOOK_INIT(msg_queue_alloc_security, selinux_msg_queue_alloc_security), - LSM_HOOK_INIT(msg_queue_free_security, selinux_msg_queue_free_security), LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate), LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl), LSM_HOOK_INIT(msg_queue_msgsnd, selinux_msg_queue_msgsnd), LSM_HOOK_INIT(msg_queue_msgrcv, selinux_msg_queue_msgrcv), LSM_HOOK_INIT(shm_alloc_security, selinux_shm_alloc_security), - LSM_HOOK_INIT(shm_free_security, selinux_shm_free_security), LSM_HOOK_INIT(shm_associate, selinux_shm_associate), LSM_HOOK_INIT(shm_shmctl, selinux_shm_shmctl), LSM_HOOK_INIT(shm_shmat, selinux_shm_shmat), LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security), - LSM_HOOK_INIT(sem_free_security, selinux_sem_free_security), LSM_HOOK_INIT(sem_associate, selinux_sem_associate), LSM_HOOK_INIT(sem_semctl, selinux_sem_semctl), LSM_HOOK_INIT(sem_semop, selinux_sem_semop), @@ -6928,16 +6773,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { static __init int selinux_init(void) { - if (!security_module_enable("selinux")) { - selinux_enabled = 0; - return 0; - } - - if (!selinux_enabled) { - pr_info("SELinux: Disabled at boot.\n"); - return 0; - } - pr_info("SELinux: Initializing.\n"); memset(&selinux_state, 0, sizeof(selinux_state)); @@ -6951,12 +6786,6 @@ static __init int selinux_init(void) default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); - sel_inode_cache = kmem_cache_create("selinux_inode_security", - sizeof(struct inode_security_struct), - 0, SLAB_PANIC, NULL); - file_security_cache = kmem_cache_create("selinux_file_security", - sizeof(struct file_security_struct), - 0, SLAB_PANIC, NULL); avc_init(); avtab_cache_init(); @@ -6999,6 +6828,9 @@ void selinux_complete_init(void) all processes and objects when they are created. */ DEFINE_LSM(selinux) = { .name = "selinux", + .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, + .enabled = &selinux_enabled, + .blobs = &selinux_blob_sizes, .init = selinux_init, }; diff --git a/security/selinux/include/audit.h b/security/selinux/include/audit.h @@ -1,9 +1,6 @@ /* * SELinux support for the Audit LSM hooks * - * Most of below header was moved from include/linux/selinux.h which - * is released under below copyrights: - * * Author: James Morris <jmorris@redhat.com> * * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com> diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h @@ -25,6 +25,8 @@ #include <linux/binfmts.h> #include <linux/in.h> #include <linux/spinlock.h> +#include <linux/lsm_hooks.h> +#include <linux/msg.h> #include <net/net_namespace.h> #include "flask.h" #include "avc.h" @@ -56,10 +58,7 @@ enum label_initialized { struct inode_security_struct { struct inode *inode; /* back pointer to inode object */ - union { - struct list_head list; /* list of inode_security_struct */ - struct rcu_head rcu; /* for freeing the inode_security_struct */ - }; + struct list_head list; /* list of inode_security_struct */ u32 task_sid; /* SID of creating task */ u32 sid; /* SID of this object */ u16 sclass; /* security class of this object */ @@ -158,4 +157,35 @@ struct bpf_security_struct { u32 sid; /*SID of bpf obj creater*/ }; +extern struct lsm_blob_sizes selinux_blob_sizes; +static inline struct task_security_struct *selinux_cred(const struct cred *cred) +{ + return cred->security + selinux_blob_sizes.lbs_cred; +} + +static inline struct file_security_struct *selinux_file(const struct file *file) +{ + return file->f_security + selinux_blob_sizes.lbs_file; +} + +static inline struct inode_security_struct *selinux_inode( + const struct inode *inode) +{ + if (unlikely(!inode->i_security)) + return NULL; + return inode->i_security + selinux_blob_sizes.lbs_inode; +} + +static inline struct msg_security_struct *selinux_msg_msg( + const struct msg_msg *msg_msg) +{ + return msg_msg->security + selinux_blob_sizes.lbs_msg_msg; +} + +static inline struct ipc_security_struct *selinux_ipc( + const struct kern_ipc_perm *ipc) +{ + return ipc->security + selinux_blob_sizes.lbs_ipc; +} + #endif /* _SELINUX_OBJSEC_H_ */ diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c @@ -1378,7 +1378,7 @@ static int sel_make_bools(struct selinux_fs_info *fsi) goto out; } - isec = (struct inode_security_struct *)inode->i_security; + isec = selinux_inode(inode); ret = security_genfs_sid(fsi->state, "selinuxfs", page, SECCLASS_FILE, &sid); if (ret) { @@ -1953,7 +1953,7 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent) } inode->i_ino = ++fsi->last_ino; - isec = (struct inode_security_struct *)inode->i_security; + isec = selinux_inode(inode); isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = LABEL_INITIALIZED; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c @@ -49,7 +49,6 @@ #include <linux/sched.h> #include <linux/audit.h> #include <linux/mutex.h> -#include <linux/selinux.h> #include <linux/flex_array.h> #include <linux/vmalloc.h> #include <net/netlabel.h> diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c @@ -79,7 +79,7 @@ static int selinux_xfrm_alloc_user(struct xfrm_sec_ctx **ctxp, gfp_t gfp) { int rc; - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); struct xfrm_sec_ctx *ctx = NULL; u32 str_len; @@ -138,7 +138,7 @@ static void selinux_xfrm_free(struct xfrm_sec_ctx *ctx) */ static int selinux_xfrm_delete(struct xfrm_sec_ctx *ctx) { - const struct task_security_struct *tsec = current_security(); + const struct task_security_struct *tsec = selinux_cred(current_cred()); if (!ctx) return 0; diff --git a/security/smack/smack.h b/security/smack/smack.h @@ -24,6 +24,7 @@ #include <linux/list.h> #include <linux/rculist.h> #include <linux/lsm_audit.h> +#include <linux/msg.h> /* * Use IPv6 port labeling if IPv6 is enabled and secmarks @@ -336,6 +337,7 @@ extern struct smack_known *smack_syslog_label; extern struct smack_known *smack_unconfined; #endif extern int smack_ptrace_rule; +extern struct lsm_blob_sizes smack_blob_sizes; extern struct smack_known smack_known_floor; extern struct smack_known smack_known_hat; @@ -356,12 +358,38 @@ extern struct list_head smack_onlycap_list; #define SMACK_HASH_SLOTS 16 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS]; +static inline struct task_smack *smack_cred(const struct cred *cred) +{ + return cred->security + smack_blob_sizes.lbs_cred; +} + +static inline struct smack_known **smack_file(const struct file *file) +{ + return (struct smack_known **)(file->f_security + + smack_blob_sizes.lbs_file); +} + +static inline struct inode_smack *smack_inode(const struct inode *inode) +{ + return inode->i_security + smack_blob_sizes.lbs_inode; +} + +static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg) +{ + return msg->security + smack_blob_sizes.lbs_msg_msg; +} + +static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc) +{ + return ipc->security + smack_blob_sizes.lbs_ipc; +} + /* * Is the directory transmuting? */ static inline int smk_inode_transmutable(const struct inode *isp) { - struct inode_smack *sip = isp->i_security; + struct inode_smack *sip = smack_inode(isp); return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0; } @@ -370,7 +398,7 @@ static inline int smk_inode_transmutable(const struct inode *isp) */ static inline struct smack_known *smk_of_inode(const struct inode *isp) { - struct inode_smack *sip = isp->i_security; + struct inode_smack *sip = smack_inode(isp); return sip->smk_inode; } @@ -382,13 +410,19 @@ static inline struct smack_known *smk_of_task(const struct task_smack *tsp) return tsp->smk_task; } -static inline struct smack_known *smk_of_task_struct(const struct task_struct *t) +static inline struct smack_known *smk_of_task_struct( + const struct task_struct *t) { struct smack_known *skp; + const struct cred *cred; rcu_read_lock(); - skp = smk_of_task(__task_cred(t)->security); + + cred = __task_cred(t); + skp = smk_of_task(smack_cred(cred)); + rcu_read_unlock(); + return skp; } @@ -405,7 +439,7 @@ static inline struct smack_known *smk_of_forked(const struct task_smack *tsp) */ static inline struct smack_known *smk_of_current(void) { - return smk_of_task(current_security()); + return smk_of_task(smack_cred(current_cred())); } /* diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c @@ -275,7 +275,7 @@ out_audit: int smk_curacc(struct smack_known *obj_known, u32 mode, struct smk_audit_info *a) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_tskacc(tsp, obj_known, mode, a); } @@ -635,12 +635,12 @@ DEFINE_MUTEX(smack_onlycap_lock); */ bool smack_privileged_cred(int cap, const struct cred *cred) { - struct task_smack *tsp = cred->security; + struct task_smack *tsp = smack_cred(cred); struct smack_known *skp = tsp->smk_task; struct smack_known_list_elem *sklep; int rc; - rc = cap_capable(cred, &init_user_ns, cap, SECURITY_CAP_AUDIT); + rc = cap_capable(cred, &init_user_ns, cap, CAP_OPT_NONE); if (rc) return false; diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c @@ -139,7 +139,7 @@ static int smk_bu_note(char *note, struct smack_known *sskp, static int smk_bu_current(char *note, struct smack_known *oskp, int mode, int rc) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); char acc[SMK_NUM_ACCESS_TYPE + 1]; if (rc <= 0) @@ -160,7 +160,7 @@ static int smk_bu_current(char *note, struct smack_known *oskp, #ifdef CONFIG_SECURITY_SMACK_BRINGUP static int smk_bu_task(struct task_struct *otp, int mode, int rc) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); struct smack_known *smk_task = smk_of_task_struct(otp); char acc[SMK_NUM_ACCESS_TYPE + 1]; @@ -182,8 +182,8 @@ static int smk_bu_task(struct task_struct *otp, int mode, int rc) #ifdef CONFIG_SECURITY_SMACK_BRINGUP static int smk_bu_inode(struct inode *inode, int mode, int rc) { - struct task_smack *tsp = current_security(); - struct inode_smack *isp = inode->i_security; + struct task_smack *tsp = smack_cred(current_cred()); + struct inode_smack *isp = smack_inode(inode); char acc[SMK_NUM_ACCESS_TYPE + 1]; if (isp->smk_flags & SMK_INODE_IMPURE) @@ -212,10 +212,10 @@ static int smk_bu_inode(struct inode *inode, int mode, int rc) #ifdef CONFIG_SECURITY_SMACK_BRINGUP static int smk_bu_file(struct file *file, int mode, int rc) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); struct smack_known *sskp = tsp->smk_task; struct inode *inode = file_inode(file); - struct inode_smack *isp = inode->i_security; + struct inode_smack *isp = smack_inode(inode); char acc[SMK_NUM_ACCESS_TYPE + 1]; if (isp->smk_flags & SMK_INODE_IMPURE) @@ -242,10 +242,10 @@ static int smk_bu_file(struct file *file, int mode, int rc) static int smk_bu_credfile(const struct cred *cred, struct file *file, int mode, int rc) { - struct task_smack *tsp = cred->security; + struct task_smack *tsp = smack_cred(cred); struct smack_known *sskp = tsp->smk_task; struct inode *inode = file_inode(file); - struct inode_smack *isp = inode->i_security; + struct inode_smack *isp = smack_inode(inode); char acc[SMK_NUM_ACCESS_TYPE + 1]; if (isp->smk_flags & SMK_INODE_IMPURE) @@ -305,50 +305,35 @@ static struct smack_known *smk_fetch(const char *name, struct inode *ip, } /** - * new_inode_smack - allocate an inode security blob + * init_inode_smack - initialize an inode security blob + * @isp: the blob to initialize * @skp: a pointer to the Smack label entry to use in the blob * - * Returns the new blob or NULL if there's no memory available */ -static struct inode_smack *new_inode_smack(struct smack_known *skp) +static void init_inode_smack(struct inode *inode, struct smack_known *skp) { - struct inode_smack *isp; - - isp = kmem_cache_zalloc(smack_inode_cache, GFP_NOFS); - if (isp == NULL) - return NULL; + struct inode_smack *isp = smack_inode(inode); isp->smk_inode = skp; isp->smk_flags = 0; mutex_init(&isp->smk_lock); - - return isp; } /** - * new_task_smack - allocate a task security blob + * init_task_smack - initialize a task security blob + * @tsp: blob to initialize * @task: a pointer to the Smack label for the running task * @forked: a pointer to the Smack label for the forked task - * @gfp: type of the memory for the allocation * - * Returns the new blob or NULL if there's no memory available */ -static struct task_smack *new_task_smack(struct smack_known *task, - struct smack_known *forked, gfp_t gfp) +static void init_task_smack(struct task_smack *tsp, struct smack_known *task, + struct smack_known *forked) { - struct task_smack *tsp; - - tsp = kzalloc(sizeof(struct task_smack), gfp); - if (tsp == NULL) - return NULL; - tsp->smk_task = task; tsp->smk_forked = forked; INIT_LIST_HEAD(&tsp->smk_rules); INIT_LIST_HEAD(&tsp->smk_relabel); mutex_init(&tsp->smk_rules_lock); - - return tsp; } /** @@ -448,7 +433,7 @@ static int smk_ptrace_rule_check(struct task_struct *tracer, rcu_read_lock(); tracercred = __task_cred(tracer); - tsp = tracercred->security; + tsp = smack_cred(tracercred); tracer_known = smk_of_task(tsp); if ((mode & PTRACE_MODE_ATTACH) && @@ -515,7 +500,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp) int rc; struct smack_known *skp; - skp = smk_of_task(current_security()); + skp = smk_of_task(smack_cred(current_cred())); rc = smk_ptrace_rule_check(ptp, skp, PTRACE_MODE_ATTACH, __func__); return rc; @@ -718,6 +703,13 @@ static int smack_set_mnt_opts(struct super_block *sb, if (sp->smk_flags & SMK_SB_INITIALIZED) return 0; + if (inode->i_security == NULL) { + int rc = lsm_inode_alloc(inode); + + if (rc) + return rc; + } + if (!smack_privileged(CAP_MAC_ADMIN)) { /* * Unprivileged mounts don't get to specify Smack values. @@ -782,17 +774,12 @@ static int smack_set_mnt_opts(struct super_block *sb, /* * Initialize the root inode. */ - isp = inode->i_security; - if (isp == NULL) { - isp = new_inode_smack(sp->smk_root); - if (isp == NULL) - return -ENOMEM; - inode->i_security = isp; - } else - isp->smk_inode = sp->smk_root; + init_inode_smack(inode, sp->smk_root); - if (transmute) + if (transmute) { + isp = smack_inode(inode); isp->smk_flags |= SMK_INODE_TRANSMUTE; + } return 0; } @@ -831,7 +818,7 @@ static int smack_sb_statfs(struct dentry *dentry) static int smack_bprm_set_creds(struct linux_binprm *bprm) { struct inode *inode = file_inode(bprm->file); - struct task_smack *bsp = bprm->cred->security; + struct task_smack *bsp = smack_cred(bprm->cred); struct inode_smack *isp; struct superblock_smack *sbsp; int rc; @@ -839,7 +826,7 @@ static int smack_bprm_set_creds(struct linux_binprm *bprm) if (bprm->called_set_creds) return 0; - isp = inode->i_security; + isp = smack_inode(inode); if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task) return 0; @@ -890,49 +877,11 @@ static int smack_inode_alloc_security(struct inode *inode) { struct smack_known *skp = smk_of_current(); - inode->i_security = new_inode_smack(skp); - if (inode->i_security == NULL) - return -ENOMEM; + init_inode_smack(inode, skp); return 0; } /** - * smack_inode_free_rcu - Free inode_smack blob from cache - * @head: the rcu_head for getting inode_smack pointer - * - * Call back function called from call_rcu() to free - * the i_security blob pointer in inode - */ -static void smack_inode_free_rcu(struct rcu_head *head) -{ - struct inode_smack *issp; - - issp = container_of(head, struct inode_smack, smk_rcu); - kmem_cache_free(smack_inode_cache, issp); -} - -/** - * smack_inode_free_security - free an inode blob using call_rcu() - * @inode: the inode with a blob - * - * Clears the blob pointer in inode using RCU - */ -static void smack_inode_free_security(struct inode *inode) -{ - struct inode_smack *issp = inode->i_security; - - /* - * The inode may still be referenced in a path walk and - * a call to smack_inode_permission() can be made - * after smack_inode_free_security() is called. - * To avoid race condition free the i_security via RCU - * and leave the current inode->i_security pointer intact. - * The inode will be freed after the RCU grace period too. - */ - call_rcu(&issp->smk_rcu, smack_inode_free_rcu); -} - -/** * smack_inode_init_security - copy out the smack from an inode * @inode: the newly created inode * @dir: containing directory object @@ -947,7 +896,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, const char **name, void **value, size_t *len) { - struct inode_smack *issp = inode->i_security; + struct inode_smack *issp = smack_inode(inode); struct smack_known *skp = smk_of_current(); struct smack_known *isp = smk_of_inode(inode); struct smack_known *dsp = smk_of_inode(dir); @@ -1285,7 +1234,7 @@ static void smack_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct smack_known *skp; - struct inode_smack *isp = d_backing_inode(dentry)->i_security; + struct inode_smack *isp = smack_inode(d_backing_inode(dentry)); if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) { isp->smk_flags |= SMK_INODE_TRANSMUTE; @@ -1366,7 +1315,7 @@ static int smack_inode_removexattr(struct dentry *dentry, const char *name) if (rc != 0) return rc; - isp = d_backing_inode(dentry)->i_security; + isp = smack_inode(d_backing_inode(dentry)); /* * Don't do anything special for these. * XATTR_NAME_SMACKIPIN @@ -1498,25 +1447,13 @@ static void smack_inode_getsecid(struct inode *inode, u32 *secid) */ static int smack_file_alloc_security(struct file *file) { - struct smack_known *skp = smk_of_current(); + struct smack_known **blob = smack_file(file); - file->f_security = skp; + *blob = smk_of_current(); return 0; } /** - * smack_file_free_security - clear a file security blob - * @file: the object - * - * The security blob for a file is a pointer to the master - * label list, so no memory is freed. - */ -static void smack_file_free_security(struct file *file) -{ - file->f_security = NULL; -} - -/** * smack_file_ioctl - Smack check on ioctls * @file: the object * @cmd: what to do @@ -1653,7 +1590,7 @@ static int smack_mmap_file(struct file *file, if (unlikely(IS_PRIVATE(file_inode(file)))) return 0; - isp = file_inode(file)->i_security; + isp = smack_inode(file_inode(file)); if (isp->smk_mmap == NULL) return 0; sbsp = file_inode(file)->i_sb->s_security; @@ -1662,7 +1599,7 @@ static int smack_mmap_file(struct file *file, return -EACCES; mkp = isp->smk_mmap; - tsp = current_security(); + tsp = smack_cred(current_cred()); skp = smk_of_current(); rc = 0; @@ -1740,7 +1677,9 @@ static int smack_mmap_file(struct file *file, */ static void smack_file_set_fowner(struct file *file) { - file->f_security = smk_of_current(); + struct smack_known **blob = smack_file(file); + + *blob = smk_of_current(); } /** @@ -1757,8 +1696,9 @@ static void smack_file_set_fowner(struct file *file) static int smack_file_send_sigiotask(struct task_struct *tsk, struct fown_struct *fown, int signum) { + struct smack_known **blob; struct smack_known *skp; - struct smack_known *tkp = smk_of_task(tsk->cred->security); + struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred)); const struct cred *tcred; struct file *file; int rc; @@ -1770,7 +1710,8 @@ static int smack_file_send_sigiotask(struct task_struct *tsk, file = container_of(fown, struct file, f_owner); /* we don't log here as rc can be overriden */ - skp = file->f_security; + blob = smack_file(file); + skp = *blob; rc = smk_access(skp, tkp, MAY_DELIVER, NULL); rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc); @@ -1811,7 +1752,7 @@ static int smack_file_receive(struct file *file) if (inode->i_sb->s_magic == SOCKFS_MAGIC) { sock = SOCKET_I(inode); ssp = sock->sk->sk_security; - tsp = current_security(); + tsp = smack_cred(current_cred()); /* * If the receiving process can't write to the * passed socket or if the passed socket can't @@ -1853,7 +1794,7 @@ static int smack_file_receive(struct file *file) */ static int smack_file_open(struct file *file) { - struct task_smack *tsp = file->f_cred->security; + struct task_smack *tsp = smack_cred(file->f_cred); struct inode *inode = file_inode(file); struct smk_audit_info ad; int rc; @@ -1881,14 +1822,7 @@ static int smack_file_open(struct file *file) */ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) { - struct task_smack *tsp; - - tsp = new_task_smack(NULL, NULL, gfp); - if (tsp == NULL) - return -ENOMEM; - - cred->security = tsp; - + init_task_smack(smack_cred(cred), NULL, NULL); return 0; } @@ -1900,15 +1834,11 @@ static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp) */ static void smack_cred_free(struct cred *cred) { - struct task_smack *tsp = cred->security; + struct task_smack *tsp = smack_cred(cred); struct smack_rule *rp; struct list_head *l; struct list_head *n; - if (tsp == NULL) - return; - cred->security = NULL; - smk_destroy_label_list(&tsp->smk_relabel); list_for_each_safe(l, n, &tsp->smk_rules) { @@ -1916,7 +1846,6 @@ static void smack_cred_free(struct cred *cred) list_del(&rp->list); kfree(rp); } - kfree(tsp); } /** @@ -1930,15 +1859,11 @@ static void smack_cred_free(struct cred *cred) static int smack_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { - struct task_smack *old_tsp = old->security; - struct task_smack *new_tsp; + struct task_smack *old_tsp = smack_cred(old); + struct task_smack *new_tsp = smack_cred(new); int rc; - new_tsp = new_task_smack(old_tsp->smk_task, old_tsp->smk_task, gfp); - if (new_tsp == NULL) - return -ENOMEM; - - new->security = new_tsp; + init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task); rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp); if (rc != 0) @@ -1946,10 +1871,7 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old, rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel, gfp); - if (rc != 0) - return rc; - - return 0; + return rc; } /** @@ -1961,15 +1883,14 @@ static int smack_cred_prepare(struct cred *new, const struct cred *old, */ static void smack_cred_transfer(struct cred *new, const struct cred *old) { - struct task_smack *old_tsp = old->security; - struct task_smack *new_tsp = new->security; + struct task_smack *old_tsp = smack_cred(old); + struct task_smack *new_tsp = smack_cred(new); new_tsp->smk_task = old_tsp->smk_task; new_tsp->smk_forked = old_tsp->smk_task; mutex_init(&new_tsp->smk_rules_lock); INIT_LIST_HEAD(&new_tsp->smk_rules); - /* cbs copy rule list */ } @@ -1980,12 +1901,12 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old) * * Sets the secid to contain a u32 version of the smack label. */ -static void smack_cred_getsecid(const struct cred *c, u32 *secid) +static void smack_cred_getsecid(const struct cred *cred, u32 *secid) { struct smack_known *skp; rcu_read_lock(); - skp = smk_of_task(c->security); + skp = smk_of_task(smack_cred(cred)); *secid = skp->smk_secid; rcu_read_unlock(); } @@ -1999,7 +1920,7 @@ static void smack_cred_getsecid(const struct cred *c, u32 *secid) */ static int smack_kernel_act_as(struct cred *new, u32 secid) { - struct task_smack *new_tsp = new->security; + struct task_smack *new_tsp = smack_cred(new); new_tsp->smk_task = smack_from_secid(secid); return 0; @@ -2016,8 +1937,8 @@ static int smack_kernel_act_as(struct cred *new, u32 secid) static int smack_kernel_create_files_as(struct cred *new, struct inode *inode) { - struct inode_smack *isp = inode->i_security; - struct task_smack *tsp = new->security; + struct inode_smack *isp = smack_inode(inode); + struct task_smack *tsp = smack_cred(new); tsp->smk_forked = isp->smk_inode; tsp->smk_task = tsp->smk_forked; @@ -2201,7 +2122,7 @@ static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, * specific behavior. This is not clean. For one thing * we can't take privilege into account. */ - skp = smk_of_task(cred->security); + skp = smk_of_task(smack_cred(cred)); rc = smk_access(skp, tkp, MAY_DELIVER, &ad); rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc); return rc; @@ -2216,7 +2137,7 @@ static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info, */ static void smack_task_to_inode(struct task_struct *p, struct inode *inode) { - struct inode_smack *isp = inode->i_security; + struct inode_smack *isp = smack_inode(inode); struct smack_known *skp = smk_of_task_struct(p); isp->smk_inode = skp; @@ -2679,7 +2600,7 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags) { struct smack_known *skp; - struct inode_smack *nsp = inode->i_security; + struct inode_smack *nsp = smack_inode(inode); struct socket_smack *ssp; struct socket *sock; int rc = 0; @@ -2888,24 +2809,13 @@ static int smack_flags_to_may(int flags) */ static int smack_msg_msg_alloc_security(struct msg_msg *msg) { - struct smack_known *skp = smk_of_current(); + struct smack_known **blob = smack_msg_msg(msg); - msg->security = skp; + *blob = smk_of_current(); return 0; } /** - * smack_msg_msg_free_security - Clear the security blob for msg_msg - * @msg: the object - * - * Clears the blob pointer - */ -static void smack_msg_msg_free_security(struct msg_msg *msg) -{ - msg->security = NULL; -} - -/** * smack_of_ipc - the smack pointer for the ipc * @isp: the object * @@ -2913,7 +2823,9 @@ static void smack_msg_msg_free_security(struct msg_msg *msg) */ static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) { - return (struct smack_known *)isp->security; + struct smack_known **blob = smack_ipc(isp); + + return *blob; } /** @@ -2924,24 +2836,13 @@ static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) */ static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) { - struct smack_known *skp = smk_of_current(); + struct smack_known **blob = smack_ipc(isp); - isp->security = skp; + *blob = smk_of_current(); return 0; } /** - * smack_ipc_free_security - Clear the security blob for ipc - * @isp: the object - * - * Clears the blob pointer - */ -static void smack_ipc_free_security(struct kern_ipc_perm *isp) -{ - isp->security = NULL; -} - -/** * smk_curacc_shm : check if current has access on shm * @isp : the object * @access : access requested @@ -3238,7 +3139,8 @@ static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg */ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) { - struct smack_known *iskp = ipp->security; + struct smack_known **blob = smack_ipc(ipp); + struct smack_known *iskp = *blob; int may = smack_flags_to_may(flag); struct smk_audit_info ad; int rc; @@ -3259,7 +3161,8 @@ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) */ static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) { - struct smack_known *iskp = ipp->security; + struct smack_known **blob = smack_ipc(ipp); + struct smack_known *iskp = *blob; *secid = iskp->smk_secid; } @@ -3287,7 +3190,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) if (inode == NULL) return; - isp = inode->i_security; + isp = smack_inode(inode); mutex_lock(&isp->smk_lock); /* @@ -3390,13 +3293,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) */ final = &smack_known_star; /* - * Fall through. - * * If a smack value has been set we want to use it, * but since tmpfs isn't giving us the opportunity * to set mount options simulate setting the * superblock default. */ + /* Fall through */ default: /* * This isn't an understood special case. @@ -3528,7 +3430,7 @@ static int smack_getprocattr(struct task_struct *p, char *name, char **value) */ static int smack_setprocattr(const char *name, void *value, size_t size) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); struct cred *new; struct smack_known *skp; struct smack_known_list_elem *sklep; @@ -3569,7 +3471,7 @@ static int smack_setprocattr(const char *name, void *value, size_t size) if (new == NULL) return -ENOMEM; - tsp = new->security; + tsp = smack_cred(new); tsp->smk_task = skp; /* * process can change its label only once @@ -4214,7 +4116,7 @@ static void smack_inet_csk_clone(struct sock *sk, static int smack_key_alloc(struct key *key, const struct cred *cred, unsigned long flags) { - struct smack_known *skp = smk_of_task(cred->security); + struct smack_known *skp = smk_of_task(smack_cred(cred)); key->security = skp; return 0; @@ -4245,7 +4147,7 @@ static int smack_key_permission(key_ref_t key_ref, { struct key *keyp; struct smk_audit_info ad; - struct smack_known *tkp = smk_of_task(cred->security); + struct smack_known *tkp = smk_of_task(smack_cred(cred)); int request = 0; int rc; @@ -4520,12 +4422,12 @@ static int smack_inode_copy_up(struct dentry *dentry, struct cred **new) return -ENOMEM; } - tsp = new_creds->security; + tsp = smack_cred(new_creds); /* * Get label from overlay inode and set it in create_sid */ - isp = d_inode(dentry->d_parent)->i_security; + isp = smack_inode(d_inode(dentry->d_parent)); skp = isp->smk_inode; tsp->smk_task = skp; *new = new_creds; @@ -4548,8 +4450,8 @@ static int smack_dentry_create_files_as(struct dentry *dentry, int mode, const struct cred *old, struct cred *new) { - struct task_smack *otsp = old->security; - struct task_smack *ntsp = new->security; + struct task_smack *otsp = smack_cred(old); + struct task_smack *ntsp = smack_cred(new); struct inode_smack *isp; int may; @@ -4562,7 +4464,7 @@ static int smack_dentry_create_files_as(struct dentry *dentry, int mode, /* * the attribute of the containing directory */ - isp = d_inode(dentry->d_parent)->i_security; + isp = smack_inode(d_inode(dentry->d_parent)); if (isp->smk_flags & SMK_INODE_TRANSMUTE) { rcu_read_lock(); @@ -4582,6 +4484,14 @@ static int smack_dentry_create_files_as(struct dentry *dentry, int mode, return 0; } +struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = { + .lbs_cred = sizeof(struct task_smack), + .lbs_file = sizeof(struct smack_known *), + .lbs_inode = sizeof(struct inode_smack), + .lbs_ipc = sizeof(struct smack_known *), + .lbs_msg_msg = sizeof(struct smack_known *), +}; + static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), @@ -4597,7 +4507,6 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(bprm_set_creds, smack_bprm_set_creds), LSM_HOOK_INIT(inode_alloc_security, smack_inode_alloc_security), - LSM_HOOK_INIT(inode_free_security, smack_inode_free_security), LSM_HOOK_INIT(inode_init_security, smack_inode_init_security), LSM_HOOK_INIT(inode_link, smack_inode_link), LSM_HOOK_INIT(inode_unlink, smack_inode_unlink), @@ -4616,7 +4525,6 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid), LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security), - LSM_HOOK_INIT(file_free_security, smack_file_free_security), LSM_HOOK_INIT(file_ioctl, smack_file_ioctl), LSM_HOOK_INIT(file_lock, smack_file_lock), LSM_HOOK_INIT(file_fcntl, smack_file_fcntl), @@ -4652,23 +4560,19 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ipc_getsecid, smack_ipc_getsecid), LSM_HOOK_INIT(msg_msg_alloc_security, smack_msg_msg_alloc_security), - LSM_HOOK_INIT(msg_msg_free_security, smack_msg_msg_free_security), LSM_HOOK_INIT(msg_queue_alloc_security, smack_ipc_alloc_security), - LSM_HOOK_INIT(msg_queue_free_security, smack_ipc_free_security), LSM_HOOK_INIT(msg_queue_associate, smack_msg_queue_associate), LSM_HOOK_INIT(msg_queue_msgctl, smack_msg_queue_msgctl), LSM_HOOK_INIT(msg_queue_msgsnd, smack_msg_queue_msgsnd), LSM_HOOK_INIT(msg_queue_msgrcv, smack_msg_queue_msgrcv), LSM_HOOK_INIT(shm_alloc_security, smack_ipc_alloc_security), - LSM_HOOK_INIT(shm_free_security, smack_ipc_free_security), LSM_HOOK_INIT(shm_associate, smack_shm_associate), LSM_HOOK_INIT(shm_shmctl, smack_shm_shmctl), LSM_HOOK_INIT(shm_shmat, smack_shm_shmat), LSM_HOOK_INIT(sem_alloc_security, smack_ipc_alloc_security), - LSM_HOOK_INIT(sem_free_security, smack_ipc_free_security), LSM_HOOK_INIT(sem_associate, smack_sem_associate), LSM_HOOK_INIT(sem_semctl, smack_sem_semctl), LSM_HOOK_INIT(sem_semop, smack_sem_semop), @@ -4759,23 +4663,23 @@ static __init void init_smack_known_list(void) */ static __init int smack_init(void) { - struct cred *cred; + struct cred *cred = (struct cred *) current->cred; struct task_smack *tsp; - if (!security_module_enable("smack")) - return 0; - smack_inode_cache = KMEM_CACHE(inode_smack, 0); if (!smack_inode_cache) return -ENOMEM; - tsp = new_task_smack(&smack_known_floor, &smack_known_floor, - GFP_KERNEL); - if (tsp == NULL) { - kmem_cache_destroy(smack_inode_cache); - return -ENOMEM; - } + /* + * Set the security state for the initial task. + */ + tsp = smack_cred(cred); + init_task_smack(tsp, &smack_known_floor, &smack_known_floor); + /* + * Register with LSM + */ + security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); smack_enabled = 1; pr_info("Smack: Initializing.\n"); @@ -4789,20 +4693,9 @@ static __init int smack_init(void) pr_info("Smack: IPv6 Netfilter enabled.\n"); #endif - /* - * Set the security state for the initial task. - */ - cred = (struct cred *) current->cred; - cred->security = tsp; - /* initialize the smack_known_list */ init_smack_known_list(); - /* - * Register with LSM - */ - security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); - return 0; } @@ -4812,5 +4705,7 @@ static __init int smack_init(void) */ DEFINE_LSM(smack) = { .name = "smack", + .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE, + .blobs = &smack_blob_sizes, .init = smack_init, }; diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c @@ -2208,14 +2208,14 @@ static const struct file_operations smk_logging_ops = { static void *load_self_seq_start(struct seq_file *s, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_start(s, pos, &tsp->smk_rules); } static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_next(s, v, pos, &tsp->smk_rules); } @@ -2262,7 +2262,7 @@ static int smk_open_load_self(struct inode *inode, struct file *file) static ssize_t smk_write_load_self(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, &tsp->smk_rules_lock, SMK_FIXED24_FMT); @@ -2414,14 +2414,14 @@ static const struct file_operations smk_load2_ops = { static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_start(s, pos, &tsp->smk_rules); } static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_next(s, v, pos, &tsp->smk_rules); } @@ -2467,7 +2467,7 @@ static int smk_open_load_self2(struct inode *inode, struct file *file) static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, &tsp->smk_rules_lock, SMK_LONG_FMT); @@ -2681,14 +2681,14 @@ static const struct file_operations smk_syslog_ops = { static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_start(s, pos, &tsp->smk_relabel); } static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); return smk_seq_next(s, v, pos, &tsp->smk_relabel); } @@ -2736,7 +2736,7 @@ static int smk_open_relabel_self(struct inode *inode, struct file *file) static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct task_smack *tsp = current_security(); + struct task_smack *tsp = smack_cred(current_cred()); char *data; int rc; LIST_HEAD(list_tmp); diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c @@ -32,6 +32,7 @@ static char *tomoyo_print_bprm(struct linux_binprm *bprm, int argv_count = bprm->argc; int envp_count = bprm->envc; bool truncated = false; + if (!buffer) return NULL; len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ "); @@ -49,6 +50,7 @@ static char *tomoyo_print_bprm(struct linux_binprm *bprm, while (offset < PAGE_SIZE) { const char *kaddr = dump->data; const unsigned char c = kaddr[offset++]; + if (cp == last_start) *cp++ = '"'; if (cp >= buffer + tomoyo_buffer_len - 32) { @@ -154,19 +156,18 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r) char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); int pos; u8 i; + if (!buffer) return NULL; tomoyo_convert_time(ktime_get_real_seconds(), &stamp); pos = snprintf(buffer, tomoyo_buffer_len - 1, - "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s " - "granted=%s (global-pid=%u) task={ pid=%u ppid=%u " - "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u " - "fsuid=%u fsgid=%u }", stamp.year, stamp.month, - stamp.day, stamp.hour, stamp.min, stamp.sec, r->profile, - tomoyo_mode[r->mode], tomoyo_yesno(r->granted), gpid, - tomoyo_sys_getpid(), tomoyo_sys_getppid(), + "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s granted=%s (global-pid=%u) task={ pid=%u ppid=%u uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", + stamp.year, stamp.month, stamp.day, stamp.hour, + stamp.min, stamp.sec, r->profile, tomoyo_mode[r->mode], + tomoyo_yesno(r->granted), gpid, tomoyo_sys_getpid(), + tomoyo_sys_getppid(), from_kuid(&init_user_ns, current_uid()), from_kgid(&init_user_ns, current_gid()), from_kuid(&init_user_ns, current_euid()), @@ -185,6 +186,7 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r) struct tomoyo_mini_stat *stat; unsigned int dev; umode_t mode; + if (!obj->stat_valid[i]) continue; stat = &obj->stat[i]; @@ -193,8 +195,8 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r) if (i & 1) { pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos, - " path%u.parent={ uid=%u gid=%u " - "ino=%lu perm=0%o }", (i >> 1) + 1, + " path%u.parent={ uid=%u gid=%u ino=%lu perm=0%o }", + (i >> 1) + 1, from_kuid(&init_user_ns, stat->uid), from_kgid(&init_user_ns, stat->gid), (unsigned long)stat->ino, @@ -202,8 +204,8 @@ static char *tomoyo_print_header(struct tomoyo_request_info *r) continue; } pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos, - " path%u={ uid=%u gid=%u ino=%lu major=%u" - " minor=%u perm=0%o type=%s", (i >> 1) + 1, + " path%u={ uid=%u gid=%u ino=%lu major=%u minor=%u perm=0%o type=%s", + (i >> 1) + 1, from_kuid(&init_user_ns, stat->uid), from_kgid(&init_user_ns, stat->gid), (unsigned long)stat->ino, @@ -249,6 +251,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, const char *symlink = NULL; int pos; const char *domainname = r->domain->domainname->name; + header = tomoyo_print_header(r); if (!header) return NULL; @@ -256,6 +259,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, len += strlen(domainname) + strlen(header) + 10; if (r->ee) { struct file *file = r->ee->bprm->file; + realpath = tomoyo_realpath_from_path(&file->f_path); bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump); if (!realpath || !bprm_info) @@ -275,6 +279,7 @@ char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, pos = snprintf(buf, len, "%s", header); if (realpath) { struct linux_binprm *bprm = r->ee->bprm; + pos += snprintf(buf + pos, len - pos, " exec={ realpath=\"%s\" argc=%d envc=%d %s }", realpath, bprm->argc, bprm->envc, bprm_info); @@ -328,6 +333,7 @@ static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns, const u8 category = tomoyo_index2category[index] + TOMOYO_MAX_MAC_INDEX; struct tomoyo_profile *p; + if (!tomoyo_policy_loaded) return false; p = tomoyo_profile(ns, profile); @@ -362,6 +368,7 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt, char *buf; struct tomoyo_log *entry; bool quota_exceeded = false; + if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type, r->matched_acl, r->granted)) goto out; @@ -413,6 +420,7 @@ void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...) { va_list args; int len; + va_start(args, fmt); len = vsnprintf((char *) &len, 1, fmt, args) + 1; va_end(args); @@ -431,6 +439,7 @@ void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...) void tomoyo_read_log(struct tomoyo_io_buffer *head) { struct tomoyo_log *ptr = NULL; + if (head->r.w_pos) return; kfree(head->read_buf); diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c @@ -197,6 +197,7 @@ static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...) { va_list args; const int pos = strlen(buffer); + va_start(args, fmt); vsnprintf(buffer + pos, len - pos - 1, fmt, args); va_end(args); @@ -214,6 +215,7 @@ static bool tomoyo_flush(struct tomoyo_io_buffer *head) while (head->r.w_pos) { const char *w = head->r.w[0]; size_t len = strlen(w); + if (len) { if (len > head->read_user_buf_avail) len = head->read_user_buf_avail; @@ -279,6 +281,7 @@ static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, size_t len; size_t pos = head->r.avail; int size = head->readbuf_size - pos; + if (size <= 0) return; va_start(args, fmt); @@ -344,13 +347,14 @@ static bool tomoyo_namespace_enabled; void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns) { unsigned int idx; + for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++) INIT_LIST_HEAD(&ns->acl_group[idx]); for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++) INIT_LIST_HEAD(&ns->group_list[idx]); for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++) INIT_LIST_HEAD(&ns->policy_list[idx]); - ns->profile_version = 20110903; + ns->profile_version = 20150505; tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list); list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list); } @@ -433,6 +437,7 @@ static void tomoyo_print_number_union_nospace u8 min_type = ptr->value_type[0]; const u8 max_type = ptr->value_type[1]; char buffer[128]; + buffer[0] = '\0'; for (i = 0; i < 2; i++) { switch (min_type) { @@ -487,6 +492,7 @@ static struct tomoyo_profile *tomoyo_assign_profile { struct tomoyo_profile *ptr; struct tomoyo_profile *entry; + if (profile >= TOMOYO_MAX_PROFILES) return NULL; ptr = ns->profile_ptr[profile]; @@ -530,6 +536,7 @@ struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, { static struct tomoyo_profile tomoyo_null_profile; struct tomoyo_profile *ptr = ns->profile_ptr[profile]; + if (!ptr) ptr = &tomoyo_null_profile; return ptr; @@ -546,6 +553,7 @@ struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns, static s8 tomoyo_find_yesno(const char *string, const char *find) { const char *cp = strstr(string, find); + if (cp) { cp += strlen(find); if (!strncmp(cp, "=yes", 4)) @@ -569,6 +577,7 @@ static void tomoyo_set_uint(unsigned int *i, const char *string, const char *find) { const char *cp = strstr(string, find); + if (cp) sscanf(cp + strlen(find), "=%u", i); } @@ -587,6 +596,7 @@ static int tomoyo_set_mode(char *name, const char *value, { u8 i; u8 config; + if (!strcmp(name, "CONFIG")) { i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; config = profile->default_config; @@ -595,10 +605,12 @@ static int tomoyo_set_mode(char *name, const char *value, for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) { int len = 0; + if (i < TOMOYO_MAX_MAC_INDEX) { const u8 c = tomoyo_index2category[i]; const char *category = tomoyo_category_keywords[c]; + len = strlen(category); if (strncmp(name, category, len) || name[len++] != ':' || name[len++] != ':') @@ -618,6 +630,7 @@ static int tomoyo_set_mode(char *name, const char *value, config = TOMOYO_CONFIG_USE_DEFAULT; } else { u8 mode; + for (mode = 0; mode < 4; mode++) if (strstr(value, tomoyo_mode[mode])) /* @@ -664,6 +677,7 @@ static int tomoyo_write_profile(struct tomoyo_io_buffer *head) unsigned int i; char *cp; struct tomoyo_profile *profile; + if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version) == 1) return 0; @@ -683,6 +697,7 @@ static int tomoyo_write_profile(struct tomoyo_io_buffer *head) const struct tomoyo_path_info *new_comment = tomoyo_get_name(cp); const struct tomoyo_path_info *old_comment; + if (!new_comment) return -ENOMEM; spin_lock(&lock); @@ -732,6 +747,7 @@ static void tomoyo_read_profile(struct tomoyo_io_buffer *head) struct tomoyo_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), namespace_list); const struct tomoyo_profile *profile; + if (head->r.eof) return; next: @@ -760,6 +776,7 @@ static void tomoyo_read_profile(struct tomoyo_io_buffer *head) u8 i; const struct tomoyo_path_info *comment = profile->comment; + tomoyo_print_namespace(head); tomoyo_io_printf(head, "%u-COMMENT=", index); tomoyo_set_string(head, comment ? comment->name : ""); @@ -788,6 +805,7 @@ static void tomoyo_read_profile(struct tomoyo_io_buffer *head) + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) { const u8 i = head->r.bit; const u8 config = profile->config[i]; + if (config == TOMOYO_CONFIG_USE_DEFAULT) continue; tomoyo_print_namespace(head); @@ -847,10 +865,10 @@ static int tomoyo_update_manager_entry(const char *manager, struct tomoyo_acl_param param = { /* .ns = &tomoyo_kernel_namespace, */ .is_delete = is_delete, - .list = &tomoyo_kernel_namespace. - policy_list[TOMOYO_ID_MANAGER], + .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], }; int error = is_delete ? -ENOENT : -ENOMEM; + if (!tomoyo_correct_domain(manager) && !tomoyo_correct_word(manager)) return -EINVAL; @@ -894,10 +912,10 @@ static void tomoyo_read_manager(struct tomoyo_io_buffer *head) { if (head->r.eof) return; - list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace. - policy_list[TOMOYO_ID_MANAGER]) { + list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) { struct tomoyo_manager *ptr = list_entry(head->r.acl, typeof(*ptr), head.list); + if (ptr->head.is_deleted) continue; if (!tomoyo_flush(head)) @@ -933,8 +951,7 @@ static bool tomoyo_manager(void) exe = tomoyo_get_exe(); if (!exe) return false; - list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace. - policy_list[TOMOYO_ID_MANAGER], head.list) { + list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list) { if (!ptr->head.is_deleted && (!tomoyo_pathcmp(domainname, ptr->manager) || !strcmp(exe, ptr->manager->name))) { @@ -945,9 +962,10 @@ static bool tomoyo_manager(void) if (!found) { /* Reduce error messages. */ static pid_t last_pid; const pid_t pid = current->pid; + if (last_pid != pid) { - printk(KERN_WARNING "%s ( %s ) is not permitted to " - "update policies.\n", domainname->name, exe); + pr_warn("%s ( %s ) is not permitted to update policies.\n", + domainname->name, exe); last_pid = pid; } } @@ -974,19 +992,21 @@ static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, unsigned int pid; struct tomoyo_domain_info *domain = NULL; bool global_pid = false; + if (strncmp(data, "select ", 7)) return false; data += 7; if (sscanf(data, "pid=%u", &pid) == 1 || (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { struct task_struct *p; + rcu_read_lock(); if (global_pid) p = find_task_by_pid_ns(pid, &init_pid_ns); else p = find_task_by_vpid(pid); if (p) - domain = tomoyo_real_domain(p); + domain = tomoyo_task(p)->domain_info; rcu_read_unlock(); } else if (!strncmp(data, "domain=", 7)) { if (tomoyo_domain_def(data + 7)) @@ -1020,10 +1040,11 @@ static bool tomoyo_select_domain(struct tomoyo_io_buffer *head, * Returns true if @a == @b, false otherwise. */ static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, - const struct tomoyo_acl_info *b) + const struct tomoyo_acl_info *b) { const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head); const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head); + return p1->domainname == p2->domainname; } @@ -1039,11 +1060,13 @@ static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a, static int tomoyo_write_task(struct tomoyo_acl_param *param) { int error = -EINVAL; + if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) { struct tomoyo_task_acl e = { .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL, .domainname = tomoyo_get_domainname(param), }; + if (e.domainname) error = tomoyo_update_domain(&e.head, sizeof(e), param, tomoyo_same_task_acl, @@ -1110,7 +1133,7 @@ static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns, }; static const struct { const char *keyword; - int (*write) (struct tomoyo_acl_param *); + int (*write)(struct tomoyo_acl_param *param); } tomoyo_callback[5] = { { "file ", tomoyo_write_file }, { "network inet ", tomoyo_write_inet_network }, @@ -1151,9 +1174,11 @@ static int tomoyo_write_domain(struct tomoyo_io_buffer *head) struct tomoyo_domain_info *domain = head->w.domain; const bool is_delete = head->w.is_delete; bool is_select = !is_delete && tomoyo_str_starts(&data, "select "); - unsigned int profile; + unsigned int idx; + if (*data == '<') { int ret = 0; + domain = NULL; if (is_delete) ret = tomoyo_delete_domain(data); @@ -1167,23 +1192,27 @@ static int tomoyo_write_domain(struct tomoyo_io_buffer *head) if (!domain) return -EINVAL; ns = domain->ns; - if (sscanf(data, "use_profile %u", &profile) == 1 - && profile < TOMOYO_MAX_PROFILES) { - if (!tomoyo_policy_loaded || ns->profile_ptr[profile]) - domain->profile = (u8) profile; + if (sscanf(data, "use_profile %u", &idx) == 1 + && idx < TOMOYO_MAX_PROFILES) { + if (!tomoyo_policy_loaded || ns->profile_ptr[idx]) + if (!is_delete) + domain->profile = (u8) idx; return 0; } - if (sscanf(data, "use_group %u\n", &profile) == 1 - && profile < TOMOYO_MAX_ACL_GROUPS) { + if (sscanf(data, "use_group %u\n", &idx) == 1 + && idx < TOMOYO_MAX_ACL_GROUPS) { if (!is_delete) - domain->group = (u8) profile; + set_bit(idx, domain->group); + else + clear_bit(idx, domain->group); return 0; } - for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) { - const char *cp = tomoyo_dif[profile]; + for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) { + const char *cp = tomoyo_dif[idx]; + if (strncmp(data, cp, strlen(cp) - 1)) continue; - domain->flags[profile] = !is_delete; + domain->flags[idx] = !is_delete; return 0; } return tomoyo_write_domain2(ns, &domain->acl_info_list, data, @@ -1225,9 +1254,11 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, const struct tomoyo_envp *envp = (typeof(envp)) (argv + cond->argc); u16 skip; + for (skip = 0; skip < head->r.cond_index; skip++) { const u8 left = condp->left; const u8 right = condp->right; + condp++; switch (left) { case TOMOYO_ARGV_ENTRY: @@ -1253,6 +1284,7 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, const u8 match = condp->equals; const u8 left = condp->left; const u8 right = condp->right; + if (!tomoyo_flush(head)) return false; condp++; @@ -1262,8 +1294,7 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, case TOMOYO_ARGV_ENTRY: tomoyo_io_printf(head, "exec.argv[%lu]%s=\"", - argv->index, argv-> - is_not ? "!" : ""); + argv->index, argv->is_not ? "!" : ""); tomoyo_set_string(head, argv->value->name); tomoyo_set_string(head, "\""); @@ -1274,12 +1305,10 @@ static bool tomoyo_print_condition(struct tomoyo_io_buffer *head, "exec.envp[\""); tomoyo_set_string(head, envp->name->name); - tomoyo_io_printf(head, "\"]%s=", envp-> - is_not ? "!" : ""); + tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : ""); if (envp->value) { tomoyo_set_string(head, "\""); - tomoyo_set_string(head, envp-> - value->name); + tomoyo_set_string(head, envp->value->name); tomoyo_set_string(head, "\""); } else { tomoyo_set_string(head, @@ -1375,6 +1404,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, struct tomoyo_path_acl *ptr = container_of(acl, typeof(*ptr), head); const u16 perm = ptr->perm; + for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) { if (!(perm & (1 << bit))) continue; @@ -1395,6 +1425,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) { struct tomoyo_task_acl *ptr = container_of(acl, typeof(*ptr), head); + tomoyo_set_group(head, "task "); tomoyo_set_string(head, "manual_domain_transition "); tomoyo_set_string(head, ptr->domainname->name); @@ -1404,6 +1435,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, struct tomoyo_path2_acl *ptr = container_of(acl, typeof(*ptr), head); const u8 perm = ptr->perm; + for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) { if (!(perm & (1 << bit))) continue; @@ -1424,6 +1456,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, struct tomoyo_path_number_acl *ptr = container_of(acl, typeof(*ptr), head); const u8 perm = ptr->perm; + for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) { if (!(perm & (1 << bit))) continue; @@ -1444,6 +1477,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, struct tomoyo_mkdev_acl *ptr = container_of(acl, typeof(*ptr), head); const u8 perm = ptr->perm; + for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) { if (!(perm & (1 << bit))) continue; @@ -1490,6 +1524,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, ->name); } else { char buf[128]; + tomoyo_print_ip(buf, sizeof(buf), &ptr->address); tomoyo_io_printf(head, "%s", buf); } @@ -1519,6 +1554,7 @@ static bool tomoyo_print_entry(struct tomoyo_io_buffer *head, } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) { struct tomoyo_mount_acl *ptr = container_of(acl, typeof(*ptr), head); + tomoyo_set_group(head, "file mount"); tomoyo_print_name_union(head, &ptr->dev_name); tomoyo_print_name_union(head, &ptr->dir_name); @@ -1562,6 +1598,7 @@ static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head, list_for_each_cookie(head->r.acl, list) { struct tomoyo_acl_info *ptr = list_entry(head->r.acl, typeof(*ptr), list); + if (!tomoyo_print_entry(head, ptr)) return false; } @@ -1583,8 +1620,9 @@ static void tomoyo_read_domain(struct tomoyo_io_buffer *head) list_for_each_cookie(head->r.domain, &tomoyo_domain_list) { struct tomoyo_domain_info *domain = list_entry(head->r.domain, typeof(*domain), list); + u8 i; + switch (head->r.step) { - u8 i; case 0: if (domain->is_deleted && !head->r.print_this_domain_only) @@ -1594,22 +1632,33 @@ static void tomoyo_read_domain(struct tomoyo_io_buffer *head) tomoyo_set_lf(head); tomoyo_io_printf(head, "use_profile %u\n", domain->profile); - tomoyo_io_printf(head, "use_group %u\n", - domain->group); for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++) if (domain->flags[i]) tomoyo_set_string(head, tomoyo_dif[i]); + head->r.index = 0; head->r.step++; - tomoyo_set_lf(head); /* fall through */ case 1: + while (head->r.index < TOMOYO_MAX_ACL_GROUPS) { + i = head->r.index++; + if (!test_bit(i, domain->group)) + continue; + tomoyo_io_printf(head, "use_group %u\n", i); + if (!tomoyo_flush(head)) + return; + } + head->r.index = 0; + head->r.step++; + tomoyo_set_lf(head); + /* fall through */ + case 2: if (!tomoyo_read_domain2(head, &domain->acl_info_list)) return; head->r.step++; if (!tomoyo_set_lf(head)) return; /* fall through */ - case 2: + case 3: head->r.step = 0; if (head->r.print_this_domain_only) goto done; @@ -1668,7 +1717,7 @@ static void tomoyo_read_pid(struct tomoyo_io_buffer *head) else p = find_task_by_vpid(pid); if (p) - domain = tomoyo_real_domain(p); + domain = tomoyo_task(p)->domain_info; rcu_read_unlock(); if (!domain) return; @@ -1711,6 +1760,7 @@ static int tomoyo_write_exception(struct tomoyo_io_buffer *head) .data = head->write_buf, }; u8 i; + if (tomoyo_str_starts(&param.data, "aggregator ")) return tomoyo_write_aggregator(&param); for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++) @@ -1722,6 +1772,7 @@ static int tomoyo_write_exception(struct tomoyo_io_buffer *head) if (tomoyo_str_starts(&param.data, "acl_group ")) { unsigned int group; char *data; + group = simple_strtoul(param.data, &data, 10); if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ') return tomoyo_write_domain2 @@ -1746,12 +1797,15 @@ static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) struct tomoyo_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), namespace_list); struct list_head *list = &ns->group_list[idx]; + list_for_each_cookie(head->r.group, list) { struct tomoyo_group *group = list_entry(head->r.group, typeof(*group), head.list); + list_for_each_cookie(head->r.acl, &group->member_list) { struct tomoyo_acl_head *ptr = list_entry(head->r.acl, typeof(*ptr), list); + if (ptr->is_deleted) continue; if (!tomoyo_flush(head)) @@ -1771,10 +1825,10 @@ static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx) head)->number); } else if (idx == TOMOYO_ADDRESS_GROUP) { char buffer[128]; - struct tomoyo_address_group *member = container_of(ptr, typeof(*member), head); + tomoyo_print_ip(buffer, sizeof(buffer), &member->address); tomoyo_io_printf(head, " %s", buffer); @@ -1802,6 +1856,7 @@ static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) struct tomoyo_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), namespace_list); struct list_head *list = &ns->policy_list[idx]; + list_for_each_cookie(head->r.acl, list) { struct tomoyo_acl_head *acl = container_of(head->r.acl, typeof(*acl), list); @@ -1814,6 +1869,7 @@ static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) { struct tomoyo_transition_control *ptr = container_of(acl, typeof(*ptr), head); + tomoyo_print_namespace(head); tomoyo_set_string(head, tomoyo_transition_type [ptr->type]); @@ -1829,6 +1885,7 @@ static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx) { struct tomoyo_aggregator *ptr = container_of(acl, typeof(*ptr), head); + tomoyo_print_namespace(head); tomoyo_set_string(head, "aggregator "); tomoyo_set_string(head, @@ -1858,6 +1915,7 @@ static void tomoyo_read_exception(struct tomoyo_io_buffer *head) { struct tomoyo_policy_namespace *ns = container_of(head->r.ns, typeof(*ns), namespace_list); + if (head->r.eof) return; while (head->r.step < TOMOYO_MAX_POLICY && @@ -1921,6 +1979,7 @@ static atomic_t tomoyo_query_observers = ATOMIC_INIT(0); static int tomoyo_truncate(char *str) { char *start = str; + while (*(unsigned char *) str > (unsigned char) ' ') str++; *str = '\0'; @@ -1943,6 +2002,7 @@ static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header) char *symlink = NULL; char *cp = strchr(header, '\n'); int len; + if (!cp) return; cp = strchr(cp + 1, '\n'); @@ -2002,6 +2062,7 @@ int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) static unsigned int tomoyo_serial; struct tomoyo_query entry = { }; bool quota_exceeded = false; + va_start(args, fmt); len = vsnprintf((char *) &len, 1, fmt, args) + 1; va_end(args); @@ -2063,8 +2124,7 @@ int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...) (tomoyo_answer_wait, entry.answer || !atomic_read(&tomoyo_query_observers), HZ)) break; - else - entry.timer++; + entry.timer++; } spin_lock(&tomoyo_query_list_lock); list_del(&entry.list); @@ -2100,6 +2160,7 @@ static struct tomoyo_domain_info *tomoyo_find_domain_by_qid { struct tomoyo_query *ptr; struct tomoyo_domain_info *domain = NULL; + spin_lock(&tomoyo_query_list_lock); list_for_each_entry(ptr, &tomoyo_query_list, list) { if (ptr->serial != serial) @@ -2142,15 +2203,15 @@ static void tomoyo_read_query(struct tomoyo_io_buffer *head) unsigned int pos = 0; size_t len = 0; char *buf; + if (head->r.w_pos) return; - if (head->read_buf) { - kfree(head->read_buf); - head->read_buf = NULL; - } + kfree(head->read_buf); + head->read_buf = NULL; spin_lock(&tomoyo_query_list_lock); list_for_each(tmp, &tomoyo_query_list) { struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); + if (pos++ != head->r.query_index) continue; len = ptr->query_len; @@ -2168,6 +2229,7 @@ static void tomoyo_read_query(struct tomoyo_io_buffer *head) spin_lock(&tomoyo_query_list_lock); list_for_each(tmp, &tomoyo_query_list) { struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); + if (pos++ != head->r.query_index) continue; /* @@ -2202,9 +2264,11 @@ static int tomoyo_write_answer(struct tomoyo_io_buffer *head) struct list_head *tmp; unsigned int serial; unsigned int answer; + spin_lock(&tomoyo_query_list_lock); list_for_each(tmp, &tomoyo_query_list) { struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); + ptr->timer = 0; } spin_unlock(&tomoyo_query_list_lock); @@ -2213,6 +2277,7 @@ static int tomoyo_write_answer(struct tomoyo_io_buffer *head) spin_lock(&tomoyo_query_list_lock); list_for_each(tmp, &tomoyo_query_list) { struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list); + if (ptr->serial != serial) continue; ptr->answer = answer; @@ -2235,7 +2300,7 @@ static int tomoyo_write_answer(struct tomoyo_io_buffer *head) static void tomoyo_read_version(struct tomoyo_io_buffer *head) { if (!head->r.eof) { - tomoyo_io_printf(head, "2.5.0"); + tomoyo_io_printf(head, "2.6.0"); head->r.eof = true; } } @@ -2287,6 +2352,7 @@ static void tomoyo_read_stat(struct tomoyo_io_buffer *head) { u8 i; unsigned int total = 0; + if (head->r.eof) return; for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) { @@ -2295,9 +2361,9 @@ static void tomoyo_read_stat(struct tomoyo_io_buffer *head) tomoyo_stat_updated[i]); if (tomoyo_stat_modified[i]) { struct tomoyo_time stamp; + tomoyo_convert_time(tomoyo_stat_modified[i], &stamp); - tomoyo_io_printf(head, " (Last: %04u/%02u/%02u " - "%02u:%02u:%02u)", + tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)", stamp.year, stamp.month, stamp.day, stamp.hour, stamp.min, stamp.sec); } @@ -2305,6 +2371,7 @@ static void tomoyo_read_stat(struct tomoyo_io_buffer *head) } for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) { unsigned int used = tomoyo_memory_used[i]; + total += used; tomoyo_io_printf(head, "Memory used by %-22s %10u", tomoyo_memory_headers[i], used); @@ -2329,6 +2396,7 @@ static int tomoyo_write_stat(struct tomoyo_io_buffer *head) { char *data = head->write_buf; u8 i; + if (tomoyo_str_starts(&data, "Memory used by ")) for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) if (tomoyo_str_starts(&data, tomoyo_memory_headers[i])) @@ -2457,6 +2525,7 @@ int tomoyo_open_control(const u8 type, struct file *file) __poll_t tomoyo_poll_control(struct file *file, poll_table *wait) { struct tomoyo_io_buffer *head = file->private_data; + if (head->poll) return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM; return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM; @@ -2472,6 +2541,7 @@ __poll_t tomoyo_poll_control(struct file *file, poll_table *wait) static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head) { struct list_head *ns; + if (head->type != TOMOYO_EXCEPTIONPOLICY && head->type != TOMOYO_PROFILE) return; @@ -2517,7 +2587,7 @@ ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer, int idx; if (!head->read) - return -ENOSYS; + return -EINVAL; if (mutex_lock_interruptible(&head->io_sem)) return -EINTR; head->read_user_buf = buffer; @@ -2557,6 +2627,7 @@ static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line) head->type == TOMOYO_PROFILE) { if (*line == '<') { char *cp = strchr(line, ' '); + if (cp) { *cp++ = '\0'; head->w.ns = tomoyo_assign_namespace(line); @@ -2589,8 +2660,9 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, size_t avail_len = buffer_len; char *cp0 = head->write_buf; int idx; + if (!head->write) - return -ENOSYS; + return -EINVAL; if (!access_ok(buffer, buffer_len)) return -EFAULT; if (mutex_lock_interruptible(&head->io_sem)) @@ -2600,9 +2672,11 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, /* Read a line and dispatch it to the policy handler. */ while (avail_len > 0) { char c; + if (head->w.avail >= head->writebuf_size - 1) { const int len = head->writebuf_size * 2; char *cp = kzalloc(len, GFP_NOFS); + if (!cp) { error = -ENOMEM; break; @@ -2701,30 +2775,32 @@ void tomoyo_check_profile(void) { struct tomoyo_domain_info *domain; const int idx = tomoyo_read_lock(); + tomoyo_policy_loaded = true; - printk(KERN_INFO "TOMOYO: 2.5.0\n"); + pr_info("TOMOYO: 2.6.0\n"); list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { const u8 profile = domain->profile; - const struct tomoyo_policy_namespace *ns = domain->ns; - if (ns->profile_version != 20110903) - printk(KERN_ERR - "Profile version %u is not supported.\n", + struct tomoyo_policy_namespace *ns = domain->ns; + + if (ns->profile_version == 20110903) { + pr_info_once("Converting profile version from %u to %u.\n", + 20110903, 20150505); + ns->profile_version = 20150505; + } + if (ns->profile_version != 20150505) + pr_err("Profile version %u is not supported.\n", ns->profile_version); else if (!ns->profile_ptr[profile]) - printk(KERN_ERR - "Profile %u (used by '%s') is not defined.\n", + pr_err("Profile %u (used by '%s') is not defined.\n", profile, domain->domainname->name); else continue; - printk(KERN_ERR - "Userland tools for TOMOYO 2.5 must be installed and " - "policy must be initialized.\n"); - printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ " - "for more information.\n"); + pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n"); + pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n"); panic("STOP!"); } tomoyo_read_unlock(idx); - printk(KERN_INFO "Mandatory Access Control activated.\n"); + pr_info("Mandatory Access Control activated.\n"); } /** @@ -2743,9 +2819,11 @@ void __init tomoyo_load_builtin_policy(void) #include "builtin-policy.h" u8 i; const int idx = tomoyo_read_lock(); + for (i = 0; i < 5; i++) { struct tomoyo_io_buffer head = { }; char *start = ""; + switch (i) { case 0: start = tomoyo_builtin_profile; @@ -2775,6 +2853,7 @@ void __init tomoyo_load_builtin_policy(void) } while (1) { char *end = strchr(start, '\n'); + if (!end) break; *end = '\0'; diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h @@ -10,6 +10,8 @@ #ifndef _SECURITY_TOMOYO_COMMON_H #define _SECURITY_TOMOYO_COMMON_H +#define pr_fmt(fmt) fmt + #include <linux/ctype.h> #include <linux/string.h> #include <linux/mm.h> @@ -29,6 +31,7 @@ #include <linux/in.h> #include <linux/in6.h> #include <linux/un.h> +#include <linux/lsm_hooks.h> #include <net/sock.h> #include <net/af_unix.h> #include <net/ip.h> @@ -681,11 +684,12 @@ struct tomoyo_domain_info { const struct tomoyo_path_info *domainname; /* Namespace for this domain. Never NULL. */ struct tomoyo_policy_namespace *ns; + /* Group numbers to use. */ + unsigned long group[TOMOYO_MAX_ACL_GROUPS / BITS_PER_LONG]; u8 profile; /* Profile number to use. */ - u8 group; /* Group number to use. */ bool is_deleted; /* Delete flag. */ bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS]; - atomic_t users; /* Number of referring credentials. */ + atomic_t users; /* Number of referring tasks. */ }; /* @@ -787,9 +791,9 @@ struct tomoyo_acl_param { * interfaces. */ struct tomoyo_io_buffer { - void (*read) (struct tomoyo_io_buffer *); - int (*write) (struct tomoyo_io_buffer *); - __poll_t (*poll) (struct file *file, poll_table *wait); + void (*read)(struct tomoyo_io_buffer *head); + int (*write)(struct tomoyo_io_buffer *head); + __poll_t (*poll)(struct file *file, poll_table *wait); /* Exclusive lock for this structure. */ struct mutex io_sem; char __user *read_user_buf; @@ -906,12 +910,18 @@ struct tomoyo_policy_namespace { struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS]; /* List for connecting to tomoyo_namespace_list list. */ struct list_head namespace_list; - /* Profile version. Currently only 20110903 is defined. */ + /* Profile version. Currently only 20150505 is defined. */ unsigned int profile_version; /* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */ const char *name; }; +/* Structure for "struct task_struct"->security. */ +struct tomoyo_task { + struct tomoyo_domain_info *domain_info; + struct tomoyo_domain_info *old_domain_info; +}; + /********** Function prototypes. **********/ bool tomoyo_address_matches_group(const bool is_ipv6, const __be32 *address, @@ -1020,6 +1030,7 @@ ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param); struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, const bool transit); +struct tomoyo_domain_info *tomoyo_domain(void); struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname); struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param, const u8 idx); @@ -1034,8 +1045,8 @@ void *tomoyo_commit_ok(void *data, const unsigned int size); void __init tomoyo_load_builtin_policy(void); void __init tomoyo_mm_init(void); void tomoyo_check_acl(struct tomoyo_request_info *r, - bool (*check_entry) (struct tomoyo_request_info *, - const struct tomoyo_acl_info *)); + bool (*check_entry)(struct tomoyo_request_info *, + const struct tomoyo_acl_info *)); void tomoyo_check_profile(void); void tomoyo_convert_time(time64_t time, struct tomoyo_time *stamp); void tomoyo_del_condition(struct list_head *element); @@ -1062,6 +1073,7 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt, /********** External variable definitions. **********/ extern bool tomoyo_policy_loaded; +extern int tomoyo_enabled; extern const char * const tomoyo_condition_keyword [TOMOYO_MAX_CONDITION_KEYWORD]; extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS]; @@ -1085,6 +1097,7 @@ extern struct tomoyo_domain_info tomoyo_kernel_domain; extern struct tomoyo_policy_namespace tomoyo_kernel_namespace; extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT]; extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT]; +extern struct lsm_blob_sizes tomoyo_blob_sizes; /********** Inlined functions. **********/ @@ -1121,6 +1134,7 @@ static inline void tomoyo_read_unlock(int idx) static inline pid_t tomoyo_sys_getppid(void) { pid_t pid; + rcu_read_lock(); pid = task_tgid_vnr(rcu_dereference(current->real_parent)); rcu_read_unlock(); @@ -1197,26 +1211,15 @@ static inline void tomoyo_put_group(struct tomoyo_group *group) } /** - * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread. - * - * Returns pointer to "struct tomoyo_domain_info" for current thread. - */ -static inline struct tomoyo_domain_info *tomoyo_domain(void) -{ - return current_cred()->security; -} - -/** - * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread. + * tomoyo_task - Get "struct tomoyo_task" for specified thread. * - * @task: Pointer to "struct task_struct". + * @task - Pointer to "struct task_struct". * - * Returns pointer to "struct tomoyo_security" for specified thread. + * Returns pointer to "struct tomoyo_task" for specified thread. */ -static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct - *task) +static inline struct tomoyo_task *tomoyo_task(struct task_struct *task) { - return task_cred_xxx(task, security); + return task->security + tomoyo_blob_sizes.lbs_task; } /** diff --git a/security/tomoyo/condition.c b/security/tomoyo/condition.c @@ -28,9 +28,11 @@ static bool tomoyo_argv(const unsigned int index, const char *arg_ptr, { int i; struct tomoyo_path_info arg; + arg.name = arg_ptr; for (i = 0; i < argc; argv++, checked++, i++) { bool result; + if (index != argv->index) continue; *checked = 1; @@ -62,12 +64,14 @@ static bool tomoyo_envp(const char *env_name, const char *env_value, int i; struct tomoyo_path_info name; struct tomoyo_path_info value; + name.name = env_name; tomoyo_fill_path_info(&name); value.name = env_value; tomoyo_fill_path_info(&value); for (i = 0; i < envc; envp++, checked++, i++) { bool result; + if (!tomoyo_path_matches_pattern(&name, envp->name)) continue; *checked = 1; @@ -113,6 +117,7 @@ static bool tomoyo_scan_bprm(struct tomoyo_execve *ee, bool result = true; u8 local_checked[32]; u8 *checked; + if (argc + envc <= sizeof(local_checked)) { checked = local_checked; memset(local_checked, 0, sizeof(local_checked)); @@ -131,6 +136,7 @@ static bool tomoyo_scan_bprm(struct tomoyo_execve *ee, /* Read. */ const char *kaddr = dump->data; const unsigned char c = kaddr[offset++]; + if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) { if (c == '\\') { arg_ptr[arg_len++] = '\\'; @@ -160,6 +166,7 @@ static bool tomoyo_scan_bprm(struct tomoyo_execve *ee, argv_count--; } else if (envp_count) { char *cp = strchr(arg_ptr, '='); + if (cp) { *cp = '\0'; if (!tomoyo_envp(arg_ptr, cp + 1, @@ -182,6 +189,7 @@ static bool tomoyo_scan_bprm(struct tomoyo_execve *ee, out: if (result) { int i; + /* Check not-yet-checked entries. */ for (i = 0; i < argc; i++) { if (checked[i]) @@ -229,6 +237,7 @@ static bool tomoyo_scan_exec_realpath(struct file *file, { bool result; struct tomoyo_path_info exe; + if (!file) return false; exe.name = tomoyo_realpath_from_path(&file->f_path); @@ -250,6 +259,7 @@ static bool tomoyo_scan_exec_realpath(struct file *file, static const struct tomoyo_path_info *tomoyo_get_dqword(char *start) { char *cp = start + strlen(start) - 1; + if (cp == start || *start++ != '"' || *cp != '"') return NULL; *cp = '\0'; @@ -270,6 +280,7 @@ static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param, struct tomoyo_name_union *ptr) { char *filename = param->data; + if (*filename == '@') return tomoyo_parse_name_union(param, ptr); ptr->filename = tomoyo_get_dqword(filename); @@ -310,6 +321,7 @@ static bool tomoyo_parse_envp(char *left, char *right, const struct tomoyo_path_info *name; const struct tomoyo_path_info *value; char *cp = left + strlen(left) - 1; + if (*cp-- != ']' || *cp != '"') goto out; *cp = '\0'; @@ -364,6 +376,7 @@ static inline bool tomoyo_same_condition(const struct tomoyo_condition *a, static u8 tomoyo_condition_type(const char *word) { u8 i; + for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) { if (!strcmp(word, tomoyo_condition_keyword[i])) break; @@ -395,6 +408,7 @@ static struct tomoyo_condition *tomoyo_commit_condition { struct tomoyo_condition *ptr; bool found = false; + if (mutex_lock_interruptible(&tomoyo_policy_lock)) { dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__); ptr = NULL; @@ -442,12 +456,14 @@ static char *tomoyo_get_transit_preference(struct tomoyo_acl_param *param, { char * const pos = param->data; bool flag; + if (*pos == '<') { e->transit = tomoyo_get_domainname(param); goto done; } { char *cp = strchr(pos, ' '); + if (cp) *cp = '\0'; flag = tomoyo_correct_path(pos) || !strcmp(pos, "keep") || @@ -489,6 +505,7 @@ struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param) tomoyo_get_transit_preference(param, &e); char * const end_of_string = start_of_string + strlen(start_of_string); char *pos; + rerun: pos = start_of_string; while (1) { @@ -498,6 +515,7 @@ rerun: char *cp; char *right_word; bool is_not; + if (!*left_word) break; /* @@ -622,8 +640,8 @@ rerun: } store_value: if (!condp) { - dprintk(KERN_WARNING "%u: dry_run left=%u right=%u " - "match=%u\n", __LINE__, left, right, !is_not); + dprintk(KERN_WARNING "%u: dry_run left=%u right=%u match=%u\n", + __LINE__, left, right, !is_not); continue; } condp->left = left; @@ -660,6 +678,7 @@ store_value: envp = (struct tomoyo_envp *) (argv + e.argc); { bool flag = false; + for (pos = start_of_string; pos < end_of_string; pos++) { if (*pos) continue; @@ -698,6 +717,7 @@ void tomoyo_get_attributes(struct tomoyo_obj_info *obj) for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) { struct inode *inode; + switch (i) { case TOMOYO_PATH1: dentry = obj->path1.dentry; @@ -718,6 +738,7 @@ void tomoyo_get_attributes(struct tomoyo_obj_info *obj) inode = d_backing_inode(dentry); if (inode) { struct tomoyo_mini_stat *stat = &obj->stat[i]; + stat->uid = inode->i_uid; stat->gid = inode->i_gid; stat->ino = inode->i_ino; @@ -726,8 +747,7 @@ void tomoyo_get_attributes(struct tomoyo_obj_info *obj) stat->rdev = inode->i_rdev; obj->stat_valid[i] = true; } - if (i & 1) /* i == TOMOYO_PATH1_PARENT || - i == TOMOYO_PATH2_PARENT */ + if (i & 1) /* TOMOYO_PATH1_PARENT or TOMOYO_PATH2_PARENT */ dput(dentry); } } @@ -758,6 +778,7 @@ bool tomoyo_condition(struct tomoyo_request_info *r, u16 argc; u16 envc; struct linux_binprm *bprm = NULL; + if (!cond) return true; condc = cond->condc; @@ -780,6 +801,7 @@ bool tomoyo_condition(struct tomoyo_request_info *r, const u8 right = condp->right; bool is_bitop[2] = { false, false }; u8 j; + condp++; /* Check argv[] and envp[] later. */ if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY) @@ -787,10 +809,11 @@ bool tomoyo_condition(struct tomoyo_request_info *r, /* Check string expressions. */ if (right == TOMOYO_NAME_UNION) { const struct tomoyo_name_union *ptr = names_p++; + struct tomoyo_path_info *symlink; + struct tomoyo_execve *ee; + struct file *file; + switch (left) { - struct tomoyo_path_info *symlink; - struct tomoyo_execve *ee; - struct file *file; case TOMOYO_SYMLINK_TARGET: symlink = obj ? obj->symlink_target : NULL; if (!symlink || @@ -812,6 +835,7 @@ bool tomoyo_condition(struct tomoyo_request_info *r, for (j = 0; j < 2; j++) { const u8 index = j ? right : left; unsigned long value = 0; + switch (index) { case TOMOYO_TASK_UID: value = from_kuid(&init_user_ns, current_uid()); @@ -874,31 +898,31 @@ bool tomoyo_condition(struct tomoyo_request_info *r, value = S_ISVTX; break; case TOMOYO_MODE_OWNER_READ: - value = S_IRUSR; + value = 0400; break; case TOMOYO_MODE_OWNER_WRITE: - value = S_IWUSR; + value = 0200; break; case TOMOYO_MODE_OWNER_EXECUTE: - value = S_IXUSR; + value = 0100; break; case TOMOYO_MODE_GROUP_READ: - value = S_IRGRP; + value = 0040; break; case TOMOYO_MODE_GROUP_WRITE: - value = S_IWGRP; + value = 0020; break; case TOMOYO_MODE_GROUP_EXECUTE: - value = S_IXGRP; + value = 0010; break; case TOMOYO_MODE_OTHERS_READ: - value = S_IROTH; + value = 0004; break; case TOMOYO_MODE_OTHERS_WRITE: - value = S_IWOTH; + value = 0002; break; case TOMOYO_MODE_OTHERS_EXECUTE: - value = S_IXOTH; + value = 0001; break; case TOMOYO_EXEC_ARGC: if (!bprm) @@ -923,6 +947,7 @@ bool tomoyo_condition(struct tomoyo_request_info *r, { u8 stat_index; struct tomoyo_mini_stat *stat; + switch (index) { case TOMOYO_PATH1_UID: case TOMOYO_PATH1_GID: @@ -1036,12 +1061,14 @@ bool tomoyo_condition(struct tomoyo_request_info *r, if (left == TOMOYO_NUMBER_UNION) { /* Fetch values now. */ const struct tomoyo_number_union *ptr = numbers_p++; + min_v[0] = ptr->values[0]; max_v[0] = ptr->values[1]; } if (right == TOMOYO_NUMBER_UNION) { /* Fetch values now. */ const struct tomoyo_number_union *ptr = numbers_p++; + if (ptr->group) { if (tomoyo_number_matches_group(min_v[0], max_v[0], diff --git a/security/tomoyo/domain.c b/security/tomoyo/domain.c @@ -30,10 +30,10 @@ struct tomoyo_domain_info tomoyo_kernel_domain; */ int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, struct tomoyo_acl_param *param, - bool (*check_duplicate) (const struct tomoyo_acl_head - *, - const struct tomoyo_acl_head - *)) + bool (*check_duplicate)(const struct tomoyo_acl_head + *, + const struct tomoyo_acl_head + *)) { int error = param->is_delete ? -ENOENT : -ENOMEM; struct tomoyo_acl_head *entry; @@ -90,13 +90,13 @@ static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a, */ int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, struct tomoyo_acl_param *param, - bool (*check_duplicate) (const struct tomoyo_acl_info - *, - const struct tomoyo_acl_info - *), - bool (*merge_duplicate) (struct tomoyo_acl_info *, - struct tomoyo_acl_info *, - const bool)) + bool (*check_duplicate)(const struct tomoyo_acl_info + *, + const struct tomoyo_acl_info + *), + bool (*merge_duplicate)(struct tomoyo_acl_info *, + struct tomoyo_acl_info *, + const bool)) { const bool is_delete = param->is_delete; int error = is_delete ? -ENOENT : -ENOMEM; @@ -157,13 +157,13 @@ out: * Caller holds tomoyo_read_lock(). */ void tomoyo_check_acl(struct tomoyo_request_info *r, - bool (*check_entry) (struct tomoyo_request_info *, - const struct tomoyo_acl_info *)) + bool (*check_entry)(struct tomoyo_request_info *, + const struct tomoyo_acl_info *)) { const struct tomoyo_domain_info *domain = r->domain; struct tomoyo_acl_info *ptr; - bool retried = false; const struct list_head *list = &domain->acl_info_list; + u16 i = 0; retry: list_for_each_entry_rcu(ptr, list, list) { @@ -177,9 +177,10 @@ retry: r->granted = true; return; } - if (!retried) { - retried = true; - list = &domain->ns->acl_group[domain->group]; + for (; i < TOMOYO_MAX_ACL_GROUPS; i++) { + if (!test_bit(i, domain->group)) + continue; + list = &domain->ns->acl_group[i++]; goto retry; } r->granted = false; @@ -198,6 +199,7 @@ LIST_HEAD(tomoyo_domain_list); static const char *tomoyo_last_word(const char *name) { const char *cp = strrchr(name, ' '); + if (cp) return cp + 1; return name; @@ -220,6 +222,7 @@ static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a, const struct tomoyo_transition_control *p2 = container_of(b, typeof(*p2), head); + return p1->type == p2->type && p1->is_last_name == p2->is_last_name && p1->domainname == p2->domainname && p1->program == p2->program; @@ -240,6 +243,7 @@ int tomoyo_write_transition_control(struct tomoyo_acl_param *param, int error = param->is_delete ? -ENOENT : -ENOMEM; char *program = param->data; char *domainname = strstr(program, " from "); + if (domainname) { *domainname = '\0'; domainname += 6; @@ -293,6 +297,7 @@ static inline bool tomoyo_scan_transition const enum tomoyo_transition_type type) { const struct tomoyo_transition_control *ptr; + list_for_each_entry_rcu(ptr, list, head.list) { if (ptr->head.is_deleted || ptr->type != type) continue; @@ -338,9 +343,11 @@ static enum tomoyo_transition_type tomoyo_transition_type { const char *last_name = tomoyo_last_word(domainname->name); enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET; + while (type < TOMOYO_MAX_TRANSITION_TYPE) { const struct list_head * const list = &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL]; + if (!tomoyo_scan_transition(list, domainname, program, last_name, type)) { type++; @@ -375,6 +382,7 @@ static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a, head); const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2), head); + return p1->original_name == p2->original_name && p1->aggregated_name == p2->aggregated_name; } @@ -394,6 +402,7 @@ int tomoyo_write_aggregator(struct tomoyo_acl_param *param) int error = param->is_delete ? -ENOENT : -ENOMEM; const char *original_name = tomoyo_read_token(param); const char *aggregated_name = tomoyo_read_token(param); + if (!tomoyo_correct_word(original_name) || !tomoyo_correct_path(aggregated_name)) return -EINVAL; @@ -426,6 +435,7 @@ static struct tomoyo_policy_namespace *tomoyo_find_namespace (const char *name, const unsigned int len) { struct tomoyo_policy_namespace *ns; + list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { if (strncmp(name, ns->name, len) || (name[len] && name[len] != ' ')) @@ -451,6 +461,7 @@ struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) struct tomoyo_policy_namespace *entry; const char *cp = domainname; unsigned int len = 0; + while (*cp && *cp++ != ' ') len++; ptr = tomoyo_find_namespace(domainname, len); @@ -466,6 +477,7 @@ struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname) ptr = tomoyo_find_namespace(domainname, len); if (!ptr && tomoyo_memory_ok(entry)) { char *name = (char *) (entry + 1); + ptr = entry; memmove(name, domainname, len); name[len] = '\0'; @@ -490,6 +502,7 @@ static bool tomoyo_namespace_jump(const char *domainname) { const char *namespace = tomoyo_current_namespace()->name; const int len = strlen(namespace); + return strncmp(domainname, namespace, len) || (domainname[len] && domainname[len] != ' '); } @@ -510,6 +523,7 @@ struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, struct tomoyo_domain_info e = { }; struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname); bool created = false; + if (entry) { if (transit) { /* @@ -546,8 +560,9 @@ struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname, */ if (transit) { const struct tomoyo_domain_info *domain = tomoyo_domain(); + e.profile = domain->profile; - e.group = domain->group; + memcpy(e.group, domain->group, sizeof(e.group)); } e.domainname = tomoyo_get_name(domainname); if (!e.domainname) @@ -569,12 +584,17 @@ out: if (entry && transit) { if (created) { struct tomoyo_request_info r; + int i; + tomoyo_init_request_info(&r, entry, TOMOYO_MAC_FILE_EXECUTE); r.granted = false; tomoyo_write_log(&r, "use_profile %u\n", entry->profile); - tomoyo_write_log(&r, "use_group %u\n", entry->group); + for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++) + if (test_bit(i, entry->group)) + tomoyo_write_log(&r, "use_group %u\n", + i); tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES); } } @@ -712,6 +732,7 @@ retry: struct tomoyo_aggregator *ptr; struct list_head *list = &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR]; + /* Check 'aggregator' directive. */ candidate = &exename; list_for_each_entry_rcu(ptr, list, head.list) { @@ -747,6 +768,7 @@ retry: */ if (ee->transition) { const char *domainname = ee->transition->name; + reject_on_transition_failure = true; if (!strcmp(domainname, "keep")) goto force_keep_domain; @@ -758,6 +780,7 @@ retry: goto force_initialize_domain; if (!strcmp(domainname, "parent")) { char *cp; + strncpy(ee->tmp, old_domain->domainname->name, TOMOYO_EXEC_TMPSIZE - 1); cp = strrchr(ee->tmp, ' '); @@ -822,8 +845,7 @@ force_jump_domain: if (domain) retval = 0; else if (reject_on_transition_failure) { - printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", - ee->tmp); + pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp); retval = -ENOMEM; } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING) retval = -ENOMEM; @@ -834,16 +856,20 @@ force_jump_domain: ee->r.granted = false; tomoyo_write_log(&ee->r, "%s", tomoyo_dif [TOMOYO_DIF_TRANSITION_FAILED]); - printk(KERN_WARNING - "ERROR: Domain '%s' not defined.\n", ee->tmp); + pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp); } } out: if (!domain) domain = old_domain; /* Update reference count on "struct tomoyo_domain_info". */ - atomic_inc(&domain->users); - bprm->cred->security = domain; + { + struct tomoyo_task *s = tomoyo_task(current); + + s->old_domain_info = s->domain_info; + s->domain_info = domain; + atomic_inc(&domain->users); + } kfree(exename.name); if (!retval) { ee->r.domain = domain; diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c @@ -214,6 +214,7 @@ static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r) const u8 type = r->param.path_number.operation; u8 radix; char buffer[64]; + switch (type) { case TOMOYO_TYPE_CREATE: case TOMOYO_TYPE_MKDIR: @@ -253,6 +254,7 @@ static bool tomoyo_check_path_acl(struct tomoyo_request_info *r, { const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl), head); + if (acl->perm & (1 << r->param.path.operation)) { r->param.path.matched_path = tomoyo_compare_name_union(r->param.path.filename, @@ -275,6 +277,7 @@ static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r, { const struct tomoyo_path_number_acl *acl = container_of(ptr, typeof(*acl), head); + return (acl->perm & (1 << r->param.path_number.operation)) && tomoyo_compare_number_union(r->param.path_number.number, &acl->number) && @@ -295,6 +298,7 @@ static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r, { const struct tomoyo_path2_acl *acl = container_of(ptr, typeof(*acl), head); + return (acl->perm & (1 << r->param.path2.operation)) && tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1) && tomoyo_compare_name_union(r->param.path2.filename2, @@ -314,6 +318,7 @@ static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r, { const struct tomoyo_mkdev_acl *acl = container_of(ptr, typeof(*acl), head); + return (acl->perm & (1 << r->param.mkdev.operation)) && tomoyo_compare_number_union(r->param.mkdev.mode, &acl->mode) && @@ -338,6 +343,7 @@ static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a, { const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head); const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head); + return tomoyo_same_name_union(&p1->name, &p2->name); } @@ -358,6 +364,7 @@ static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a, ->perm; u16 perm = *a_perm; const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm; + if (is_delete) perm &= ~b_perm; else @@ -384,6 +391,7 @@ static int tomoyo_update_path_acl(const u16 perm, .perm = perm }; int error; + if (!tomoyo_parse_name_union(param, &e.name)) error = -EINVAL; else @@ -407,6 +415,7 @@ static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a, { const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head); const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head); + return tomoyo_same_name_union(&p1->name, &p2->name) && tomoyo_same_number_union(&p1->mode, &p2->mode) && tomoyo_same_number_union(&p1->major, &p2->major) && @@ -431,6 +440,7 @@ static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a, u8 perm = *a_perm; const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head) ->perm; + if (is_delete) perm &= ~b_perm; else @@ -457,6 +467,7 @@ static int tomoyo_update_mkdev_acl(const u8 perm, .perm = perm }; int error; + if (!tomoyo_parse_name_union(param, &e.name) || !tomoyo_parse_number_union(param, &e.mode) || !tomoyo_parse_number_union(param, &e.major) || @@ -486,6 +497,7 @@ static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a, { const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head); const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head); + return tomoyo_same_name_union(&p1->name1, &p2->name1) && tomoyo_same_name_union(&p1->name2, &p2->name2); } @@ -507,6 +519,7 @@ static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a, ->perm; u8 perm = *a_perm; const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm; + if (is_delete) perm &= ~b_perm; else @@ -533,6 +546,7 @@ static int tomoyo_update_path2_acl(const u8 perm, .perm = perm }; int error; + if (!tomoyo_parse_name_union(param, &e.name1) || !tomoyo_parse_name_union(param, &e.name2)) error = -EINVAL; @@ -621,6 +635,7 @@ static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a, head); const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2), head); + return tomoyo_same_name_union(&p1->name, &p2->name) && tomoyo_same_number_union(&p1->number, &p2->number); } @@ -643,6 +658,7 @@ static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a, u8 perm = *a_perm; const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head) ->perm; + if (is_delete) perm &= ~b_perm; else @@ -667,6 +683,7 @@ static int tomoyo_update_path_number_acl(const u8 perm, .perm = perm }; int error; + if (!tomoyo_parse_name_union(param, &e.name) || !tomoyo_parse_number_union(param, &e.number)) error = -EINVAL; @@ -947,6 +964,7 @@ static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a, { const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head); const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head); + return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) && tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) && tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) && @@ -966,6 +984,7 @@ static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param) { struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL }; int error; + if (!tomoyo_parse_name_union(param, &e.dev_name) || !tomoyo_parse_name_union(param, &e.dir_name) || !tomoyo_parse_name_union(param, &e.fs_type) || @@ -995,6 +1014,7 @@ int tomoyo_write_file(struct tomoyo_acl_param *param) u16 perm = 0; u8 type; const char *operation = tomoyo_read_token(param); + for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) if (tomoyo_permstr(operation, tomoyo_path_keyword[type])) perm |= 1 << type; diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c @@ -77,11 +77,13 @@ static bool tomoyo_name_used_by_io_buffer(const char *string) spin_lock(&tomoyo_io_buffer_list_lock); list_for_each_entry(head, &tomoyo_io_buffer_list, list) { int i; + head->users++; spin_unlock(&tomoyo_io_buffer_list_lock); mutex_lock(&head->io_sem); for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) { const char *w = head->r.w[i]; + if (w < string || w > string + size) continue; in_use = true; @@ -108,6 +110,7 @@ static inline void tomoyo_del_transition_control(struct list_head *element) { struct tomoyo_transition_control *ptr = container_of(element, typeof(*ptr), head.list); + tomoyo_put_name(ptr->domainname); tomoyo_put_name(ptr->program); } @@ -123,6 +126,7 @@ static inline void tomoyo_del_aggregator(struct list_head *element) { struct tomoyo_aggregator *ptr = container_of(element, typeof(*ptr), head.list); + tomoyo_put_name(ptr->original_name); tomoyo_put_name(ptr->aggregated_name); } @@ -138,6 +142,7 @@ static inline void tomoyo_del_manager(struct list_head *element) { struct tomoyo_manager *ptr = container_of(element, typeof(*ptr), head.list); + tomoyo_put_name(ptr->manager); } @@ -152,6 +157,7 @@ static void tomoyo_del_acl(struct list_head *element) { struct tomoyo_acl_info *acl = container_of(element, typeof(*acl), list); + tomoyo_put_condition(acl->cond); switch (acl->type) { case TOMOYO_TYPE_PATH_ACL: @@ -226,6 +232,7 @@ static void tomoyo_del_acl(struct list_head *element) { struct tomoyo_task_acl *entry = container_of(acl, typeof(*entry), head); + tomoyo_put_name(entry->domainname); } break; @@ -247,6 +254,7 @@ static inline void tomoyo_del_domain(struct list_head *element) container_of(element, typeof(*domain), list); struct tomoyo_acl_info *acl; struct tomoyo_acl_info *tmp; + /* * Since this domain is referenced from neither * "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete @@ -286,6 +294,7 @@ void tomoyo_del_condition(struct list_head *element) = (const struct tomoyo_argv *) (names_p + names_count); const struct tomoyo_envp *envp = (const struct tomoyo_envp *) (argv + argc); + for (i = 0; i < numbers_count; i++) tomoyo_put_number_union(numbers_p++); for (i = 0; i < names_count; i++) @@ -321,6 +330,7 @@ static inline void tomoyo_del_path_group(struct list_head *element) { struct tomoyo_path_group *member = container_of(element, typeof(*member), head.list); + tomoyo_put_name(member->member_name); } @@ -335,6 +345,7 @@ static inline void tomoyo_del_group(struct list_head *element) { struct tomoyo_group *group = container_of(element, typeof(*group), head.list); + tomoyo_put_name(group->group_name); } @@ -476,6 +487,7 @@ static void tomoyo_collect_member(const enum tomoyo_policy_id id, { struct tomoyo_acl_head *member; struct tomoyo_acl_head *tmp; + list_for_each_entry_safe(member, tmp, member_list, list) { if (!member->is_deleted) continue; @@ -495,6 +507,7 @@ static void tomoyo_collect_acl(struct list_head *list) { struct tomoyo_acl_info *acl; struct tomoyo_acl_info *tmp; + list_for_each_entry_safe(acl, tmp, list, list) { if (!acl->is_deleted) continue; @@ -513,10 +526,12 @@ static void tomoyo_collect_entry(void) int i; enum tomoyo_policy_id id; struct tomoyo_policy_namespace *ns; + mutex_lock(&tomoyo_policy_lock); { struct tomoyo_domain_info *domain; struct tomoyo_domain_info *tmp; + list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list, list) { tomoyo_collect_acl(&domain->acl_info_list); @@ -534,6 +549,7 @@ static void tomoyo_collect_entry(void) { struct tomoyo_shared_acl_head *ptr; struct tomoyo_shared_acl_head *tmp; + list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list, list) { if (atomic_read(&ptr->users) > 0) @@ -547,6 +563,7 @@ static void tomoyo_collect_entry(void) struct list_head *list = &ns->group_list[i]; struct tomoyo_group *group; struct tomoyo_group *tmp; + switch (i) { case 0: id = TOMOYO_ID_PATH_GROUP; @@ -574,6 +591,7 @@ static void tomoyo_collect_entry(void) struct list_head *list = &tomoyo_name_list[i]; struct tomoyo_shared_acl_head *ptr; struct tomoyo_shared_acl_head *tmp; + list_for_each_entry_safe(ptr, tmp, list, list) { if (atomic_read(&ptr->users) > 0) continue; @@ -595,6 +613,7 @@ static int tomoyo_gc_thread(void *unused) { /* Garbage collector thread is exclusive. */ static DEFINE_MUTEX(tomoyo_gc_mutex); + if (!mutex_trylock(&tomoyo_gc_mutex)) goto out; tomoyo_collect_entry(); diff --git a/security/tomoyo/group.c b/security/tomoyo/group.c @@ -75,11 +75,13 @@ int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type) { struct tomoyo_group *group = tomoyo_get_group(param, type); int error = -EINVAL; + if (!group) return -ENOMEM; param->list = &group->member_list; if (type == TOMOYO_PATH_GROUP) { struct tomoyo_path_group e = { }; + e.member_name = tomoyo_get_name(tomoyo_read_token(param)); if (!e.member_name) { error = -ENOMEM; @@ -90,6 +92,7 @@ int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type) tomoyo_put_name(e.member_name); } else if (type == TOMOYO_NUMBER_GROUP) { struct tomoyo_number_group e = { }; + if (param->data[0] == '@' || !tomoyo_parse_number_union(param, &e.number)) goto out; @@ -129,6 +132,7 @@ tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, const struct tomoyo_group *group) { struct tomoyo_path_group *member; + list_for_each_entry_rcu(member, &group->member_list, head.list) { if (member->head.is_deleted) continue; @@ -156,6 +160,7 @@ bool tomoyo_number_matches_group(const unsigned long min, { struct tomoyo_number_group *member; bool matched = false; + list_for_each_entry_rcu(member, &group->member_list, head.list) { if (member->head.is_deleted) continue; diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c @@ -37,11 +37,12 @@ __setup("TOMOYO_loader=", tomoyo_loader_setup); static bool tomoyo_policy_loader_exists(void) { struct path path; + if (!tomoyo_loader) tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER; if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) { - printk(KERN_INFO "Not activating Mandatory Access Control " - "as %s does not exist.\n", tomoyo_loader); + pr_info("Not activating Mandatory Access Control as %s does not exist.\n", + tomoyo_loader); return false; } path_put(&path); @@ -96,8 +97,7 @@ void tomoyo_load_policy(const char *filename) if (!tomoyo_policy_loader_exists()) return; done = true; - printk(KERN_INFO "Calling %s to load policy. Please wait.\n", - tomoyo_loader); + pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader); argv[0] = (char *) tomoyo_loader; argv[1] = NULL; envp[0] = "HOME=/"; diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c @@ -19,9 +19,9 @@ void tomoyo_warn_oom(const char *function) /* Reduce error messages. */ static pid_t tomoyo_last_pid; const pid_t pid = current->pid; + if (tomoyo_last_pid != pid) { - printk(KERN_WARNING "ERROR: Out of memory at %s.\n", - function); + pr_warn("ERROR: Out of memory at %s.\n", function); tomoyo_last_pid = pid; } if (!tomoyo_policy_loaded) @@ -48,6 +48,7 @@ bool tomoyo_memory_ok(void *ptr) { if (ptr) { const size_t s = ksize(ptr); + tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s; if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] || tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <= @@ -73,6 +74,7 @@ bool tomoyo_memory_ok(void *ptr) void *tomoyo_commit_ok(void *data, const unsigned int size) { void *ptr = kzalloc(size, GFP_NOFS); + if (tomoyo_memory_ok(ptr)) { memmove(ptr, data, size); memset(data, 0, size); @@ -98,6 +100,7 @@ struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param, struct list_head *list; const char *group_name = tomoyo_read_token(param); bool found = false; + if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP) return NULL; e.group_name = tomoyo_get_name(group_name); @@ -116,6 +119,7 @@ struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param, } if (!found) { struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e)); + if (entry) { INIT_LIST_HEAD(&entry->member_list); atomic_set(&entry->head.users, 1); @@ -191,6 +195,7 @@ struct tomoyo_policy_namespace tomoyo_kernel_namespace; void __init tomoyo_mm_init(void) { int idx; + for (idx = 0; idx < TOMOYO_MAX_HASH; idx++) INIT_LIST_HEAD(&tomoyo_name_list[idx]); tomoyo_kernel_namespace.name = "<kernel>"; diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c @@ -49,6 +49,7 @@ static bool tomoyo_check_mount_acl(struct tomoyo_request_info *r, { const struct tomoyo_mount_acl *acl = container_of(ptr, typeof(*acl), head); + return tomoyo_compare_number_union(r->param.mount.flags, &acl->flags) && tomoyo_compare_name_union(r->param.mount.type, @@ -89,6 +90,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, struct tomoyo_path_info rdir; int need_dev = 0; int error = -ENOMEM; + r->obj = &obj; /* Get fstype. */ diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c @@ -94,11 +94,13 @@ static char *tomoyo_get_absolute_path(const struct path *path, char * const buff const int buflen) { char *pos = ERR_PTR(-ENOMEM); + if (buflen >= 256) { /* go to whatever namespace root we are under */ pos = d_absolute_path(path, buffer, buflen - 1); if (!IS_ERR(pos) && *pos == '/' && pos[1]) { struct inode *inode = d_backing_inode(path->dentry); + if (inode && S_ISDIR(inode->i_mode)) { buffer[buflen - 2] = '/'; buffer[buflen - 1] = '\0'; @@ -123,10 +125,12 @@ static char *tomoyo_get_dentry_path(struct dentry *dentry, char * const buffer, const int buflen) { char *pos = ERR_PTR(-ENOMEM); + if (buflen >= 256) { pos = dentry_path_raw(dentry, buffer, buflen - 1); if (!IS_ERR(pos) && *pos == '/' && pos[1]) { struct inode *inode = d_backing_inode(dentry); + if (inode && S_ISDIR(inode->i_mode)) { buffer[buflen - 2] = '/'; buffer[buflen - 1] = '\0'; @@ -150,12 +154,14 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer, { struct super_block *sb = dentry->d_sb; char *pos = tomoyo_get_dentry_path(dentry, buffer, buflen); + if (IS_ERR(pos)) return pos; /* Convert from $PID to self if $PID is current thread. */ if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') { char *ep; const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10); + if (*ep == '/' && pid && pid == task_tgid_nr_ns(current, sb->s_fs_info)) { pos = ep - 5; @@ -170,6 +176,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer, goto prepend_filesystem_name; { struct inode *inode = d_backing_inode(sb->s_root); + /* * Use filesystem name if filesystem does not support rename() * operation. @@ -182,6 +189,7 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer, char name[64]; int name_len; const dev_t dev = sb->s_dev; + name[sizeof(name) - 1] = '\0'; snprintf(name, sizeof(name) - 1, "dev(%u,%u):", MAJOR(dev), MINOR(dev)); @@ -197,6 +205,7 @@ prepend_filesystem_name: { const char *name = sb->s_type->name; const int name_len = strlen(name); + pos -= name_len + 1; if (pos < buffer) goto out; @@ -223,10 +232,10 @@ static char *tomoyo_get_socket_name(const struct path *path, char * const buffer struct inode *inode = d_backing_inode(path->dentry); struct socket *sock = inode ? SOCKET_I(inode) : NULL; struct sock *sk = sock ? sock->sk : NULL; + if (sk) { - snprintf(buffer, buflen, "socket:[family=%u:type=%u:" - "protocol=%u]", sk->sk_family, sk->sk_type, - sk->sk_protocol); + snprintf(buffer, buflen, "socket:[family=%u:type=%u:protocol=%u]", + sk->sk_family, sk->sk_type, sk->sk_protocol); } else { snprintf(buffer, buflen, "socket:[unknown]"); } @@ -255,12 +264,14 @@ char *tomoyo_realpath_from_path(const struct path *path) unsigned int buf_len = PAGE_SIZE / 2; struct dentry *dentry = path->dentry; struct super_block *sb; + if (!dentry) return NULL; sb = dentry->d_sb; while (1) { char *pos; struct inode *inode; + buf_len <<= 1; kfree(buf); buf = kmalloc(buf_len, GFP_NOFS); @@ -323,6 +334,7 @@ char *tomoyo_realpath_nofollow(const char *pathname) if (pathname && kern_path(pathname, 0, &path) == 0) { char *buf = tomoyo_realpath_from_path(&path); + path_put(&path); return buf; } diff --git a/security/tomoyo/securityfs_if.c b/security/tomoyo/securityfs_if.c @@ -21,6 +21,7 @@ static bool tomoyo_check_task_acl(struct tomoyo_request_info *r, { const struct tomoyo_task_acl *acl = container_of(ptr, typeof(*acl), head); + return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname); } @@ -42,6 +43,7 @@ static ssize_t tomoyo_write_self(struct file *file, const char __user *buf, { char *data; int error; + if (!count || count >= TOMOYO_EXEC_TMPSIZE - 10) return -ENOMEM; data = memdup_user_nul(buf, count); @@ -52,6 +54,7 @@ static ssize_t tomoyo_write_self(struct file *file, const char __user *buf, const int idx = tomoyo_read_lock(); struct tomoyo_path_info name; struct tomoyo_request_info r; + name.name = data; tomoyo_fill_path_info(&name); /* Check "task manual_domain_transition" permission. */ @@ -67,18 +70,14 @@ static ssize_t tomoyo_write_self(struct file *file, const char __user *buf, if (!new_domain) { error = -ENOENT; } else { - struct cred *cred = prepare_creds(); - if (!cred) { - error = -ENOMEM; - } else { - struct tomoyo_domain_info *old_domain = - cred->security; - cred->security = new_domain; - atomic_inc(&new_domain->users); - atomic_dec(&old_domain->users); - commit_creds(cred); - error = 0; - } + struct tomoyo_task *s = tomoyo_task(current); + struct tomoyo_domain_info *old_domain = + s->domain_info; + + s->domain_info = new_domain; + atomic_inc(&new_domain->users); + atomic_dec(&old_domain->users); + error = 0; } } tomoyo_read_unlock(idx); @@ -104,6 +103,7 @@ static ssize_t tomoyo_read_self(struct file *file, char __user *buf, const char *domain = tomoyo_domain()->domainname->name; loff_t len = strlen(domain); loff_t pos = *ppos; + if (pos >= len || !count) return 0; len -= pos; @@ -234,10 +234,14 @@ static void __init tomoyo_create_entry(const char *name, const umode_t mode, */ static int __init tomoyo_initerface_init(void) { + struct tomoyo_domain_info *domain; struct dentry *tomoyo_dir; + if (!tomoyo_enabled) + return 0; + domain = tomoyo_domain(); /* Don't create securityfs entries unless registered. */ - if (current_cred()->security != &tomoyo_kernel_domain) + if (domain != &tomoyo_kernel_domain) return 0; tomoyo_dir = securityfs_create_dir("tomoyo", NULL); diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c @@ -9,17 +9,19 @@ #include "common.h" /** - * tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank(). + * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread. * - * @new: Pointer to "struct cred". - * @gfp: Memory allocation flags. - * - * Returns 0. + * Returns pointer to "struct tomoyo_domain_info" for current thread. */ -static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp) +struct tomoyo_domain_info *tomoyo_domain(void) { - new->security = NULL; - return 0; + struct tomoyo_task *s = tomoyo_task(current); + + if (s->old_domain_info && !current->in_execve) { + atomic_dec(&s->old_domain_info->users); + s->old_domain_info = NULL; + } + return s->domain_info; } /** @@ -34,42 +36,38 @@ static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp) static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp) { - struct tomoyo_domain_info *domain = old->security; - new->security = domain; - if (domain) - atomic_inc(&domain->users); + /* Restore old_domain_info saved by previous execve() request. */ + struct tomoyo_task *s = tomoyo_task(current); + + if (s->old_domain_info && !current->in_execve) { + atomic_dec(&s->domain_info->users); + s->domain_info = s->old_domain_info; + s->old_domain_info = NULL; + } return 0; } /** - * tomoyo_cred_transfer - Target for security_transfer_creds(). + * tomoyo_bprm_committed_creds - Target for security_bprm_committed_creds(). * - * @new: Pointer to "struct cred". - * @old: Pointer to "struct cred". + * @bprm: Pointer to "struct linux_binprm". */ -static void tomoyo_cred_transfer(struct cred *new, const struct cred *old) +static void tomoyo_bprm_committed_creds(struct linux_binprm *bprm) { - tomoyo_cred_prepare(new, old, 0); -} + /* Clear old_domain_info saved by execve() request. */ + struct tomoyo_task *s = tomoyo_task(current); -/** - * tomoyo_cred_free - Target for security_cred_free(). - * - * @cred: Pointer to "struct cred". - */ -static void tomoyo_cred_free(struct cred *cred) -{ - struct tomoyo_domain_info *domain = cred->security; - if (domain) - atomic_dec(&domain->users); + atomic_dec(&s->old_domain_info->users); + s->old_domain_info = NULL; } +#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER /** * tomoyo_bprm_set_creds - Target for security_bprm_set_creds(). * * @bprm: Pointer to "struct linux_binprm". * - * Returns 0 on success, negative value otherwise. + * Returns 0. */ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) { @@ -79,29 +77,15 @@ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) */ if (bprm->called_set_creds) return 0; -#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER /* * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested * for the first time. */ if (!tomoyo_policy_loaded) tomoyo_load_policy(bprm->filename); -#endif - /* - * Release reference to "struct tomoyo_domain_info" stored inside - * "bprm->cred->security". New reference to "struct tomoyo_domain_info" - * stored inside "bprm->cred->security" will be acquired later inside - * tomoyo_find_next_domain(). - */ - atomic_dec(&((struct tomoyo_domain_info *) - bprm->cred->security)->users); - /* - * Tell tomoyo_bprm_check_security() is called for the first time of an - * execve operation. - */ - bprm->cred->security = NULL; return 0; } +#endif /** * tomoyo_bprm_check_security - Target for security_bprm_check(). @@ -112,23 +96,24 @@ static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) */ static int tomoyo_bprm_check_security(struct linux_binprm *bprm) { - struct tomoyo_domain_info *domain = bprm->cred->security; + struct tomoyo_task *s = tomoyo_task(current); /* * Execute permission is checked against pathname passed to do_execve() * using current domain. */ - if (!domain) { + if (!s->old_domain_info) { const int idx = tomoyo_read_lock(); const int err = tomoyo_find_next_domain(bprm); + tomoyo_read_unlock(idx); return err; } /* * Read permission is checked against interpreters using next domain. */ - return tomoyo_check_open_permission(domain, &bprm->file->f_path, - O_RDONLY); + return tomoyo_check_open_permission(s->domain_info, + &bprm->file->f_path, O_RDONLY); } /** @@ -167,6 +152,7 @@ static int tomoyo_path_truncate(const struct path *path) static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; + return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL); } @@ -183,6 +169,7 @@ static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, umode_t mode) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; + return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path, mode & S_IALLUGO); } @@ -198,6 +185,7 @@ static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; + return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL); } @@ -214,6 +202,7 @@ static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry, const char *old_name) { struct path path = { .mnt = parent->mnt, .dentry = dentry }; + return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name); } @@ -271,6 +260,7 @@ static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_di { struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry }; struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry }; + return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2); } @@ -291,6 +281,7 @@ static int tomoyo_path_rename(const struct path *old_parent, { struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry }; struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry }; + return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2); } @@ -322,11 +313,11 @@ static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, */ static int tomoyo_file_open(struct file *f) { - int flags = f->f_flags; /* Don't check read permission here if called from do_execve(). */ if (current->in_execve) return 0; - return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags); + return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, + f->f_flags); } /** @@ -370,6 +361,7 @@ static int tomoyo_path_chmod(const struct path *path, umode_t mode) static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid) { int error = 0; + if (uid_valid(uid)) error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, from_kuid(&init_user_ns, uid)); @@ -419,6 +411,7 @@ static int tomoyo_sb_mount(const char *dev_name, const struct path *path, static int tomoyo_sb_umount(struct vfsmount *mnt, int flags) { struct path path = { .mnt = mnt, .dentry = mnt->mnt_root }; + return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL); } @@ -493,16 +486,61 @@ static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg, return tomoyo_socket_sendmsg_permission(sock, msg, size); } +struct lsm_blob_sizes tomoyo_blob_sizes __lsm_ro_after_init = { + .lbs_task = sizeof(struct tomoyo_task), +}; + +/** + * tomoyo_task_alloc - Target for security_task_alloc(). + * + * @task: Pointer to "struct task_struct". + * @flags: clone() flags. + * + * Returns 0. + */ +static int tomoyo_task_alloc(struct task_struct *task, + unsigned long clone_flags) +{ + struct tomoyo_task *old = tomoyo_task(current); + struct tomoyo_task *new = tomoyo_task(task); + + new->domain_info = old->domain_info; + atomic_inc(&new->domain_info->users); + new->old_domain_info = NULL; + return 0; +} + +/** + * tomoyo_task_free - Target for security_task_free(). + * + * @task: Pointer to "struct task_struct". + */ +static void tomoyo_task_free(struct task_struct *task) +{ + struct tomoyo_task *s = tomoyo_task(task); + + if (s->domain_info) { + atomic_dec(&s->domain_info->users); + s->domain_info = NULL; + } + if (s->old_domain_info) { + atomic_dec(&s->old_domain_info->users); + s->old_domain_info = NULL; + } +} + /* * tomoyo_security_ops is a "struct security_operations" which is used for * registering TOMOYO. */ static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = { - LSM_HOOK_INIT(cred_alloc_blank, tomoyo_cred_alloc_blank), LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare), - LSM_HOOK_INIT(cred_transfer, tomoyo_cred_transfer), - LSM_HOOK_INIT(cred_free, tomoyo_cred_free), + LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds), + LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc), + LSM_HOOK_INIT(task_free, tomoyo_task_free), +#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER LSM_HOOK_INIT(bprm_set_creds, tomoyo_bprm_set_creds), +#endif LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security), LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl), LSM_HOOK_INIT(file_open, tomoyo_file_open), @@ -531,6 +569,8 @@ static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = { /* Lock for GC. */ DEFINE_SRCU(tomoyo_ss); +int tomoyo_enabled __lsm_ro_after_init = 1; + /** * tomoyo_init - Register TOMOYO Linux as a LSM module. * @@ -538,19 +578,23 @@ DEFINE_SRCU(tomoyo_ss); */ static int __init tomoyo_init(void) { - struct cred *cred = (struct cred *) current_cred(); + struct tomoyo_task *s = tomoyo_task(current); - if (!security_module_enable("tomoyo")) - return 0; /* register ourselves with the security framework */ security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo"); - printk(KERN_INFO "TOMOYO Linux initialized\n"); - cred->security = &tomoyo_kernel_domain; + pr_info("TOMOYO Linux initialized\n"); + s->domain_info = &tomoyo_kernel_domain; + atomic_inc(&tomoyo_kernel_domain.users); + s->old_domain_info = NULL; tomoyo_mm_init(); + return 0; } DEFINE_LSM(tomoyo) = { .name = "tomoyo", + .enabled = &tomoyo_enabled, + .flags = LSM_FLAG_LEGACY_MAJOR, + .blobs = &tomoyo_blob_sizes, .init = tomoyo_init, }; diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c @@ -91,6 +91,7 @@ const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = { void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp) { struct tm tm; + time64_to_tm(time64, 0, &tm); stamp->sec = tm.tm_sec; stamp->min = tm.tm_min; @@ -113,6 +114,7 @@ void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp) bool tomoyo_permstr(const char *string, const char *keyword) { const char *cp = strstr(string, keyword); + if (cp) return cp == string || *(cp - 1) == '/'; return false; @@ -132,6 +134,7 @@ char *tomoyo_read_token(struct tomoyo_acl_param *param) { char *pos = param->data; char *del = strchr(pos, ' '); + if (del) *del++ = '\0'; else @@ -152,6 +155,7 @@ const struct tomoyo_path_info *tomoyo_get_domainname { char *start = param->data; char *pos = start; + while (*pos) { if (*pos++ != ' ' || *pos++ == '/') continue; @@ -181,8 +185,10 @@ u8 tomoyo_parse_ulong(unsigned long *result, char **str) const char *cp = *str; char *ep; int base = 10; + if (*cp == '0') { char c = *(cp + 1); + if (c == 'x' || c == 'X') { base = 16; cp += 2; @@ -240,6 +246,7 @@ bool tomoyo_parse_name_union(struct tomoyo_acl_param *param, struct tomoyo_name_union *ptr) { char *filename; + if (param->data[0] == '@') { param->data++; ptr->group = tomoyo_get_group(param, TOMOYO_PATH_GROUP); @@ -266,6 +273,7 @@ bool tomoyo_parse_number_union(struct tomoyo_acl_param *param, char *data; u8 type; unsigned long v; + memset(ptr, 0, sizeof(*ptr)); if (param->data[0] == '@') { param->data++; @@ -429,6 +437,7 @@ static bool tomoyo_correct_word2(const char *string, size_t len) unsigned char c; unsigned char d; unsigned char e; + if (!len) goto out; while (len--) { @@ -533,6 +542,7 @@ bool tomoyo_correct_domain(const unsigned char *domainname) return true; while (1) { const unsigned char *cp = strchr(domainname, ' '); + if (!cp) break; if (*domainname != '/' || @@ -554,6 +564,7 @@ bool tomoyo_domain_def(const unsigned char *buffer) { const unsigned char *cp; int len; + if (*buffer != '<') return false; cp = strchr(buffer, ' '); @@ -668,6 +679,9 @@ static bool tomoyo_file_matches_pattern2(const char *filename, { while (filename < filename_end && pattern < pattern_end) { char c; + int i; + int j; + if (*pattern != '\\') { if (*filename++ != *pattern++) return false; @@ -676,8 +690,6 @@ static bool tomoyo_file_matches_pattern2(const char *filename, c = *filename; pattern++; switch (*pattern) { - int i; - int j; case '?': if (c == '/') { return false; @@ -985,6 +997,7 @@ int tomoyo_init_request_info(struct tomoyo_request_info *r, struct tomoyo_domain_info *domain, const u8 index) { u8 profile; + memset(r, 0, sizeof(*r)); if (!domain) domain = tomoyo_domain(); @@ -1018,6 +1031,7 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { u16 perm; u8 i; + if (ptr->is_deleted) continue; switch (ptr->type) { @@ -1062,9 +1076,8 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) domain->flags[TOMOYO_DIF_QUOTA_WARNED] = true; /* r->granted = false; */ tomoyo_write_log(r, "%s", tomoyo_dif[TOMOYO_DIF_QUOTA_WARNED]); - printk(KERN_WARNING "WARNING: " - "Domain '%s' has too many ACLs to hold. " - "Stopped learning mode.\n", domain->domainname->name); + pr_warn("WARNING: Domain '%s' has too many ACLs to hold. Stopped learning mode.\n", + domain->domainname->name); } return false; } diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c @@ -479,9 +479,15 @@ static void __init yama_init_sysctl(void) static inline void yama_init_sysctl(void) { } #endif /* CONFIG_SYSCTL */ -void __init yama_add_hooks(void) +static int __init yama_init(void) { pr_info("Yama: becoming mindful.\n"); security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama"); yama_init_sysctl(); + return 0; } + +DEFINE_LSM(yama) = { + .name = "yama", + .init = yama_init, +}; diff --git a/tools/testing/selftests/safesetid/.gitignore b/tools/testing/selftests/safesetid/.gitignore @@ -0,0 +1 @@ +safesetid-test diff --git a/tools/testing/selftests/safesetid/Makefile b/tools/testing/selftests/safesetid/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for mount selftests. +CFLAGS = -Wall -lcap -O2 + +TEST_PROGS := run_tests.sh +TEST_GEN_FILES := safesetid-test + +include ../lib.mk diff --git a/tools/testing/selftests/safesetid/config b/tools/testing/selftests/safesetid/config @@ -0,0 +1,2 @@ +CONFIG_SECURITY=y +CONFIG_SECURITYFS=y diff --git a/tools/testing/selftests/safesetid/safesetid-test.c b/tools/testing/selftests/safesetid/safesetid-test.c @@ -0,0 +1,334 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include <stdio.h> +#include <errno.h> +#include <pwd.h> +#include <string.h> +#include <syscall.h> +#include <sys/capability.h> +#include <sys/types.h> +#include <sys/mount.h> +#include <sys/prctl.h> +#include <sys/wait.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdbool.h> +#include <stdarg.h> + +#ifndef CLONE_NEWUSER +# define CLONE_NEWUSER 0x10000000 +#endif + +#define ROOT_USER 0 +#define RESTRICTED_PARENT 1 +#define ALLOWED_CHILD1 2 +#define ALLOWED_CHILD2 3 +#define NO_POLICY_USER 4 + +char* add_whitelist_policy_file = "/sys/kernel/security/safesetid/add_whitelist_policy"; + +static void die(char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + exit(EXIT_FAILURE); +} + +static bool vmaybe_write_file(bool enoent_ok, char *filename, char *fmt, va_list ap) +{ + char buf[4096]; + int fd; + ssize_t written; + int buf_len; + + buf_len = vsnprintf(buf, sizeof(buf), fmt, ap); + if (buf_len < 0) { + printf("vsnprintf failed: %s\n", + strerror(errno)); + return false; + } + if (buf_len >= sizeof(buf)) { + printf("vsnprintf output truncated\n"); + return false; + } + + fd = open(filename, O_WRONLY); + if (fd < 0) { + if ((errno == ENOENT) && enoent_ok) + return true; + return false; + } + written = write(fd, buf, buf_len); + if (written != buf_len) { + if (written >= 0) { + printf("short write to %s\n", filename); + return false; + } else { + printf("write to %s failed: %s\n", + filename, strerror(errno)); + return false; + } + } + if (close(fd) != 0) { + printf("close of %s failed: %s\n", + filename, strerror(errno)); + return false; + } + return true; +} + +static bool write_file(char *filename, char *fmt, ...) +{ + va_list ap; + bool ret; + + va_start(ap, fmt); + ret = vmaybe_write_file(false, filename, fmt, ap); + va_end(ap); + + return ret; +} + +static void ensure_user_exists(uid_t uid) +{ + struct passwd p; + + FILE *fd; + char name_str[10]; + + if (getpwuid(uid) == NULL) { + memset(&p,0x00,sizeof(p)); + fd=fopen("/etc/passwd","a"); + if (fd == NULL) + die("couldn't open file\n"); + if (fseek(fd, 0, SEEK_END)) + die("couldn't fseek\n"); + snprintf(name_str, 10, "%d", uid); + p.pw_name=name_str; + p.pw_uid=uid; + p.pw_gecos="Test account"; + p.pw_dir="/dev/null"; + p.pw_shell="/bin/false"; + int value = putpwent(&p,fd); + if (value != 0) + die("putpwent failed\n"); + if (fclose(fd)) + die("fclose failed\n"); + } +} + +static void ensure_securityfs_mounted(void) +{ + int fd = open(add_whitelist_policy_file, O_WRONLY); + if (fd < 0) { + if (errno == ENOENT) { + // Need to mount securityfs + if (mount("securityfs", "/sys/kernel/security", + "securityfs", 0, NULL) < 0) + die("mounting securityfs failed\n"); + } else { + die("couldn't find securityfs for unknown reason\n"); + } + } else { + if (close(fd) != 0) { + die("close of %s failed: %s\n", + add_whitelist_policy_file, strerror(errno)); + } + } +} + +static void write_policies(void) +{ + ssize_t written; + int fd; + + fd = open(add_whitelist_policy_file, O_WRONLY); + if (fd < 0) + die("cant open add_whitelist_policy file\n"); + written = write(fd, "1:2", strlen("1:2")); + if (written != strlen("1:2")) { + if (written >= 0) { + die("short write to %s\n", add_whitelist_policy_file); + } else { + die("write to %s failed: %s\n", + add_whitelist_policy_file, strerror(errno)); + } + } + written = write(fd, "1:3", strlen("1:3")); + if (written != strlen("1:3")) { + if (written >= 0) { + die("short write to %s\n", add_whitelist_policy_file); + } else { + die("write to %s failed: %s\n", + add_whitelist_policy_file, strerror(errno)); + } + } + if (close(fd) != 0) { + die("close of %s failed: %s\n", + add_whitelist_policy_file, strerror(errno)); + } +} + +static bool test_userns(bool expect_success) +{ + uid_t uid; + char map_file_name[32]; + size_t sz = sizeof(map_file_name); + pid_t cpid; + bool success; + + uid = getuid(); + + int clone_flags = CLONE_NEWUSER; + cpid = syscall(SYS_clone, clone_flags, NULL); + if (cpid == -1) { + printf("clone failed"); + return false; + } + + if (cpid == 0) { /* Code executed by child */ + // Give parent 1 second to write map file + sleep(1); + exit(EXIT_SUCCESS); + } else { /* Code executed by parent */ + if(snprintf(map_file_name, sz, "/proc/%d/uid_map", cpid) < 0) { + printf("preparing file name string failed"); + return false; + } + success = write_file(map_file_name, "0 0 1", uid); + return success == expect_success; + } + + printf("should not reach here"); + return false; +} + +static void test_setuid(uid_t child_uid, bool expect_success) +{ + pid_t cpid, w; + int wstatus; + + cpid = fork(); + if (cpid == -1) { + die("fork\n"); + } + + if (cpid == 0) { /* Code executed by child */ + setuid(child_uid); + if (getuid() == child_uid) + exit(EXIT_SUCCESS); + else + exit(EXIT_FAILURE); + } else { /* Code executed by parent */ + do { + w = waitpid(cpid, &wstatus, WUNTRACED | WCONTINUED); + if (w == -1) { + die("waitpid\n"); + } + + if (WIFEXITED(wstatus)) { + if (WEXITSTATUS(wstatus) == EXIT_SUCCESS) { + if (expect_success) { + return; + } else { + die("unexpected success\n"); + } + } else { + if (expect_success) { + die("unexpected failure\n"); + } else { + return; + } + } + } else if (WIFSIGNALED(wstatus)) { + if (WTERMSIG(wstatus) == 9) { + if (expect_success) + die("killed unexpectedly\n"); + else + return; + } else { + die("unexpected signal: %d\n", wstatus); + } + } else { + die("unexpected status: %d\n", wstatus); + } + } while (!WIFEXITED(wstatus) && !WIFSIGNALED(wstatus)); + } + + die("should not reach here\n"); +} + +static void ensure_users_exist(void) +{ + ensure_user_exists(ROOT_USER); + ensure_user_exists(RESTRICTED_PARENT); + ensure_user_exists(ALLOWED_CHILD1); + ensure_user_exists(ALLOWED_CHILD2); + ensure_user_exists(NO_POLICY_USER); +} + +static void drop_caps(bool setid_retained) +{ + cap_value_t cap_values[] = {CAP_SETUID, CAP_SETGID}; + cap_t caps; + + caps = cap_get_proc(); + if (setid_retained) + cap_set_flag(caps, CAP_EFFECTIVE, 2, cap_values, CAP_SET); + else + cap_clear(caps); + cap_set_proc(caps); + cap_free(caps); +} + +int main(int argc, char **argv) +{ + ensure_users_exist(); + ensure_securityfs_mounted(); + write_policies(); + + if (prctl(PR_SET_KEEPCAPS, 1L)) + die("Error with set keepcaps\n"); + + // First test to make sure we can write userns mappings from a user + // that doesn't have any restrictions (as long as it has CAP_SETUID); + setuid(NO_POLICY_USER); + setgid(NO_POLICY_USER); + + // Take away all but setid caps + drop_caps(true); + + // Need PR_SET_DUMPABLE flag set so we can write /proc/[pid]/uid_map + // from non-root parent process. + if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0)) + die("Error with set dumpable\n"); + + if (!test_userns(true)) { + die("test_userns failed when it should work\n"); + } + + setuid(RESTRICTED_PARENT); + setgid(RESTRICTED_PARENT); + + test_setuid(ROOT_USER, false); + test_setuid(ALLOWED_CHILD1, true); + test_setuid(ALLOWED_CHILD2, true); + test_setuid(NO_POLICY_USER, false); + + if (!test_userns(false)) { + die("test_userns worked when it should fail\n"); + } + + // Now take away all caps + drop_caps(false); + test_setuid(2, false); + test_setuid(3, false); + test_setuid(4, false); + + // NOTE: this test doesn't clean up users that were created in + // /etc/passwd or flush policies that were added to the LSM. + return EXIT_SUCCESS; +} diff --git a/tools/testing/selftests/safesetid/safesetid-test.sh b/tools/testing/selftests/safesetid/safesetid-test.sh @@ -0,0 +1,26 @@ +#!/bin/bash + +TCID="safesetid-test.sh" +errcode=0 + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 + +check_root() +{ + uid=$(id -u) + if [ $uid -ne 0 ]; then + echo $TCID: must be run as root >&2 + exit $ksft_skip + fi +} + +main_function() +{ + check_root + ./safesetid-test +} + +main_function +echo "$TCID: done" +exit $errcode