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(parent: e6939d3) | patch
arm64: mm: only wrprotect clean ptes if they are present
authorWill Deacon <will.deacon@arm.com>
Wed, 9 Jan 2013 11:08:10 +0000 (11:08 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Thu, 10 Jan 2013 10:43:44 +0000 (10:43 +0000)
commit111d97876188e5aca0337f2a131fd0e5c9f380a9
tree5fc357a4979da3d355735215a01900b3f2e2994ctree | snapshot
parente6939d353ed47a66e3c441abade94d81fc97b4f5commit | diff
arm64: mm: only wrprotect clean ptes if they are present

Marking non-present ptes as read-only can corrupt file ptes, breaking
things like swap and file mappings.

This patch ensures that we only manipulate user pte bits when the pte
is marked present.

Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/include/asm/pgtable.h diff | blob | history
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