arm64: mm: Correct show_pte behaviour

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show_pte makes use of the *_none_or_clear_bad style functions. If a
pgd, pud or pmd is identified as being bad, it will then be cleared.

As show_pte appears to be called from either the user or kernel
fault handlers this side effect can lead to unpredictable behaviour;
especially as TLB entries are not invalidated.

This patch removes the page table sanitisation from show_pte. If a
bad pgd, pud or pmd is encountered it is left unmodified.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Steve Capper 2013-04-19 15:49:31 +01:00 • committed by Catalin Marinas

parent f15a2a12d0

commit 4339e3f389

1 changed files with 3 additions and 3 deletions

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arch/arm64/mm/fault.c

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