| From 33eaa58f854770dc9c98411a356c98e3a53edfda Mon Sep 17 00:00:00 2001 |
| From: Catalin Marinas <catalin.marinas@arm.com> |
| Date: Wed, 28 Nov 2012 17:06:05 +0000 |
| Subject: arm64: Make !dirty ptes read-only |
| |
| 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); |
| } |
| |
