From a5220f902e102b27f529ffe3b9ef221583378597 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Wed, 28 Nov 2012 17:06:05 +0000 Subject: [PATCH] arm64: Make !dirty ptes read-only commit 33eaa58f854770dc9c98411a356c98e3a53edfda upstream. The AArch64 Linux port relies on the mm code to wrprotect clean ptes. This however is not the case with newly created ptes and PAGE_SHARED(_EXEC) is writable but !dirty. Signed-off-by: Catalin Marinas Signed-off-by: Greg Kroah-Hartman --- arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 14aba2db6776..64b133949502 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -159,6 +159,8 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, { if (pte_present_exec_user(pte)) __sync_icache_dcache(pte, addr); + if (!pte_dirty(pte)) + pte = pte_wrprotect(pte); set_pte(ptep, pte); } -- 2.39.5