arm64: Ignore the 'write' ESR flag on cache maintenance faults

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ESR.WnR bit is always set on data cache maintenance faults even though
the page is not required to have write permission. If a translation
fault (page not yet mapped) happens for read-only user address range,
Linux incorrectly assumes a permission fault. This patch adds the check
of the ESR.CM bit during the page fault handling to ignore the 'write'
flag.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Tim Northover <Tim.Northover@arm.com>
Cc: stable@vger.kernel.org

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Catalin Marinas 2013-05-07 16:57:06 +01:00

parent ed1f23637a

commit 0e7f7bcc3f

1 changed files with 2 additions and 1 deletions

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arch/arm64/mm/fault.c

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