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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-02 11:47:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-02 11:47:29 -0800 |
| commit | e7c42a89e9f16039684418dfe3c43b068734ff8f (patch) | |
| tree | e619c1436f99893a0a7643b021a8ec568fe11882 /arch/x86/include/asm/uaccess.h | |
| parent | df49fd0ff83a0c20c5ce68a790a4f43601ecdc4a (diff) | |
| parent | 9cd05ad2910b55238e3c720c99ad896dc538301b (diff) | |
| download | linux-e7c42a89e9f16039684418dfe3c43b068734ff8f.tar.bz2 | |
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 (limited to 'arch/x86/include/asm/uaccess.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 780f2b42c8ef..c1334aaaa78d 100644 --- 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(); \ |