3.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: Catalin Marinas <catalin.mari...@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.mari...@arm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@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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