diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2012-11-28 17:06:05 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-11 09:18:17 -0800 |
| commit | a5220f902e102b27f529ffe3b9ef221583378597 (patch) | |
| tree | 07d520d0354399b7e3679c9bcd30a75326907750 /arch | |
| parent | 21838dbf96ce1e94d1ba80fdd491f9a0a6352ff1 (diff) | |
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 <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 2 |
1 files changed, 2 insertions, 0 deletions
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); } |