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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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16
include/linux/syscalls.h
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@@ -207,6 +207,22 @@ extern struct trace_event_functions exit_syscall_print_funcs;
} \
static inline long SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#ifdef TIF_FSCHECK
/*
* Called before coming back to user-mode. Returning to user-mode with an
* address limit different than USER_DS can allow to overwrite kernel memory.
*/
static inline void addr_limit_user_check(void)
{
if (!test_thread_flag(TIF_FSCHECK))
return;
BUG_ON(!segment_eq(get_fs(), USER_DS));
clear_thread_flag(TIF_FSCHECK);
}
#endif
asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special,
qid_t id, void __user *addr);
asmlinkage long sys_time(time_t __user *tloc);