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commit 24ed334f33666f2ae929ccc08f72e7e72e353c64
parent e80bc229691a4f601a2476e07cbdf08a289a2ad6
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu, 25 Oct 2018 13:32:00 -0700

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

Pull LoadPin updates from James Morris:
 "From Kees: This is a small reporting improvement and the param change
  needed for the ordering series (but since the loadpin change is
  desired and separable, I'm putting it here)"

* 'next-loadpin' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  LoadPin: Rename boot param "enabled" to "enforce"
  LoadPin: Report friendly block device name

Diffstat:
Msecurity/loadpin/Kconfig | 4++--
Msecurity/loadpin/loadpin.c | 26+++++++++++++++-----------
2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/security/loadpin/Kconfig b/security/loadpin/Kconfig @@ -10,10 +10,10 @@ config SECURITY_LOADPIN have a root filesystem backed by a read-only device such as dm-verity or a CDROM. -config SECURITY_LOADPIN_ENABLED +config SECURITY_LOADPIN_ENFORCE bool "Enforce LoadPin at boot" depends on SECURITY_LOADPIN help If selected, LoadPin will enforce pinning at boot. If not selected, it can be enabled at boot with the kernel parameter - "loadpin.enabled=1". + "loadpin.enforce=1". diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c @@ -44,7 +44,7 @@ static void report_load(const char *origin, struct file *file, char *operation) kfree(pathname); } -static int enabled = IS_ENABLED(CONFIG_SECURITY_LOADPIN_ENABLED); +static int enforce = IS_ENABLED(CONFIG_SECURITY_LOADPIN_ENFORCE); static struct super_block *pinned_root; static DEFINE_SPINLOCK(pinned_root_spinlock); @@ -60,8 +60,8 @@ static struct ctl_path loadpin_sysctl_path[] = { static struct ctl_table loadpin_sysctl_table[] = { { - .procname = "enabled", - .data = &enabled, + .procname = "enforce", + .data = &enforce, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, @@ -84,8 +84,11 @@ static void check_pinning_enforcement(struct super_block *mnt_sb) * device, allow sysctl to change modes for testing. */ if (mnt_sb->s_bdev) { + char bdev[BDEVNAME_SIZE]; + ro = bdev_read_only(mnt_sb->s_bdev); - pr_info("dev(%u,%u): %s\n", + bdevname(mnt_sb->s_bdev, bdev); + pr_info("%s (%u:%u): %s\n", bdev, MAJOR(mnt_sb->s_bdev->bd_dev), MINOR(mnt_sb->s_bdev->bd_dev), ro ? "read-only" : "writable"); @@ -97,7 +100,7 @@ static void check_pinning_enforcement(struct super_block *mnt_sb) loadpin_sysctl_table)) pr_notice("sysctl registration failed!\n"); else - pr_info("load pinning can be disabled.\n"); + pr_info("enforcement can be disabled.\n"); } else pr_info("load pinning engaged.\n"); } @@ -128,7 +131,7 @@ static int loadpin_read_file(struct file *file, enum kernel_read_file_id id) /* This handles the older init_module API that has a NULL file. */ if (!file) { - if (!enabled) { + if (!enforce) { report_load(origin, NULL, "old-api-pinning-ignored"); return 0; } @@ -151,7 +154,7 @@ static int loadpin_read_file(struct file *file, enum kernel_read_file_id id) * Unlock now since it's only pinned_root we care about. * In the worst case, we will (correctly) report pinning * failures before we have announced that pinning is - * enabled. This would be purely cosmetic. + * enforcing. This would be purely cosmetic. */ spin_unlock(&pinned_root_spinlock); check_pinning_enforcement(pinned_root); @@ -161,7 +164,7 @@ static int loadpin_read_file(struct file *file, enum kernel_read_file_id id) } if (IS_ERR_OR_NULL(pinned_root) || load_root != pinned_root) { - if (unlikely(!enabled)) { + if (unlikely(!enforce)) { report_load(origin, file, "pinning-ignored"); return 0; } @@ -186,10 +189,11 @@ static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = { void __init loadpin_add_hooks(void) { - pr_info("ready to pin (currently %sabled)", enabled ? "en" : "dis"); + pr_info("ready to pin (currently %senforcing)\n", + enforce ? "" : "not "); security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin"); } /* Should not be mutable after boot, so not listed in sysfs (perm == 0). */ -module_param(enabled, int, 0); -MODULE_PARM_DESC(enabled, "Pin module/firmware loading (default: true)"); +module_param(enforce, int, 0); +MODULE_PARM_DESC(enforce, "Enforce module/firmware pinning");