diff options
| author | Po-Yu Chuang <ratbert@faraday-tech.com> | 2011-06-09 09:42:17 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-09 11:15:07 +0200 |
| commit | 373ce3020b03fb6199415ab866595c7d627bbc97 (patch) | |
| tree | 20c2bc022c8eb35f418ee8e44a7801cf39ad09c4 /arch | |
| parent | ARM: 6954/1: zImage: fix Thumb2 breakage (diff) | |
| download | linux-373ce3020b03fb6199415ab866595c7d627bbc97.tar.xz linux-373ce3020b03fb6199415ab866595c7d627bbc97.zip | |
ARM: 6955/1: cmpxchg syscall should data abort if page not write
If the page to cmpxchg is user mode read only (not write),
we should simulate a data abort first.
Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/traps.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index d52eec268b47..c5ead3c2c618 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -563,7 +563,7 @@ asmlinkage int arm_syscall(int no, struct pt_regs *regs) if (!pmd_present(*pmd)) goto bad_access; pte = pte_offset_map_lock(mm, pmd, addr, &ptl); - if (!pte_present(*pte) || !pte_dirty(*pte)) { + if (!pte_present(*pte) || !pte_write(*pte) || !pte_dirty(*pte)) { pte_unmap_unlock(pte, ptl); goto bad_access; } |