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commit e7c42a89e9f16039684418dfe3c43b068734ff8f
parent df49fd0ff83a0c20c5ce68a790a4f43601ecdc4a
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sat,  2 Mar 2019 11:47:29 -0800

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "Two last minute fixes:

   - Prevent value evaluation via functions happening in the user access
     enabled region of __put_user() (put another way: make sure to
     evaluate the value to be stored in user space _before_ enabling
     user space accesses)

   - Correct the definition of a Hyper-V hypercall constant"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/hyper-v: Fix definition of HV_MAX_FLUSH_REP_COUNT
  x86/uaccess: Don't leak the AC flag into __put_user() value evaluation

Diffstat:
March/x86/include/asm/hyperv-tlfs.h | 2+-
March/x86/include/asm/uaccess.h | 6++++--
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h @@ -841,7 +841,7 @@ union hv_gpa_page_range { * count is equal with how many entries of union hv_gpa_page_range can * be populated into the input parameter page. */ -#define HV_MAX_FLUSH_REP_COUNT (PAGE_SIZE - 2 * sizeof(u64) / \ +#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) / \ sizeof(union hv_gpa_page_range)) struct hv_guest_mapping_flush_list { diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h @@ -284,7 +284,7 @@ do { \ __put_user_goto(x, ptr, "l", "k", "ir", label); \ break; \ case 8: \ - __put_user_goto_u64((__typeof__(*ptr))(x), ptr, label); \ + __put_user_goto_u64(x, ptr, label); \ break; \ default: \ __put_user_bad(); \ @@ -431,8 +431,10 @@ do { \ ({ \ __label__ __pu_label; \ int __pu_err = -EFAULT; \ + __typeof__(*(ptr)) __pu_val; \ + __pu_val = x; \ __uaccess_begin(); \ - __put_user_size((x), (ptr), (size), __pu_label); \ + __put_user_size(__pu_val, (ptr), (size), __pu_label); \ __pu_err = 0; \ __pu_label: \ __uaccess_end(); \