arm64: entry: Apply BP hardening for high-priority synchronous exceptions

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Commit 5dfc6ed277 upstream.

Software-step and PC alignment fault exceptions have higher priority than
instruction abort exceptions, so apply the BP hardening hooks there too
if the user PC appears to reside in kernel space.

Reported-by: Dan Hettena <dhettena@nvidia.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Will Deacon 2018-02-02 17:31:39 +00:00 • committed by Greg Kroah-Hartman

parent aab3306701

commit 6b47a8256a

2 changed files with 13 additions and 2 deletions

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6

arch/arm64/kernel/entry.S

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9

arch/arm64/mm/fault.c

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