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

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Pull syscall updates from Ingo Molnar:
 "Improve the security of set_fs(): we now check the address limit on a
  number of key platforms (x86, arm, arm64) before returning to
  user-space - without adding overhead to the typical system call fast
  path"

* 'x86-syscall-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  arm64/syscalls: Check address limit on user-mode return
  arm/syscalls: Check address limit on user-mode return
  x86/syscalls: Check address limit on user-mode return
This commit is contained in:
Linus Torvalds
2017-09-04 11:18:17 -07:00
parent e0a195b522 cf7de27ab3
commit 6c51e67b64
11 changed files with 63 additions and 11 deletions
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2
arch/arm/include/asm/uaccess.h
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@@ -70,6 +70,8 @@ static inline void set_fs(mm_segment_t fs)
{
current_thread_info()->addr_limit = fs;
modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
/* On user-mode return, check fs is correct */
set_thread_flag(TIF_FSCHECK);
}
#define segment_eq(a, b) ((a) == (b))