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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-04 11:18:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-04 11:18:17 -0700 |
| commit | 6c51e67b64d169419fb13318035bb442f9176612 (patch) | |
| tree | ae6c64a9d703983f9df5f72e74419de2e388e32b /arch/arm/kernel/entry-common.S | |
| parent | e0a195b5225e1285806622cc146dc5c3312fb392 (diff) | |
| parent | cf7de27ab35172a9240f079477cae3146a182998 (diff) | |
Merge branch 'x86-syscall-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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
Diffstat (limited to 'arch/arm/kernel/entry-common.S')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index eb5cd77bf1d8..e33c32d56193 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -41,7 +41,9 @@ ret_fast_syscall: UNWIND(.cantunwind ) disable_irq_notrace @ disable interrupts ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing - tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK + tst r1, #_TIF_SYSCALL_WORK + bne fast_work_pending + tst r1, #_TIF_WORK_MASK bne fast_work_pending /* perform architecture specific actions before user return */ @@ -67,12 +69,15 @@ ret_fast_syscall: str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 disable_irq_notrace @ disable interrupts ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing - tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK + tst r1, #_TIF_SYSCALL_WORK + bne fast_work_pending + tst r1, #_TIF_WORK_MASK beq no_work_pending UNWIND(.fnend ) ENDPROC(ret_fast_syscall) /* Slower path - fall through to work_pending */ +fast_work_pending: #endif tst r1, #_TIF_SYSCALL_WORK |