Commit 33eaa58f authored Nov 28, 2012 by Catalin Marinas

arm64: Make !dirty ptes read-only



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>
Cc: <stable@vger.kernel.org>

parent 8f3bfa58

arch/arm64/include/asm/pgtable.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}