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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>
This commit is contained in:
Po-Yu Chuang 2011-06-09 08:42:17 +01:00 committed by Russell King
parent 720c60e194
commit 373ce3020b
1 changed files with 1 additions and 1 deletions
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2
arch/arm/kernel/traps.c
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@ -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;
}