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Commit 373ce302 authored by Po-Yu Chuang's avatar Po-Yu Chuang Committed by Russell King
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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: default avatarPo-Yu Chuang <ratbert@faraday-tech.com>
Acked-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 720c60e1

arch/arm/kernel/traps.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

		}