Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 009/123] arm64: Make !dirty ptes read-only | Date | Wed, 9 Jan 2013 12:34:08 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Catalin Marinas <catalin.marinas@arm.com>
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 <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm64/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+)
--- 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_ { if (pte_present_exec_user(pte)) __sync_icache_dcache(pte, addr); + if (!pte_dirty(pte)) + pte = pte_wrprotect(pte); set_pte(ptep, pte); }
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