arm64: entry: Apply BP hardening for suspicious interrupts from EL0

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Commit 30d88c0e3a upstream.

It is possible to take an IRQ from EL0 following a branch to a kernel
address in such a way that the IRQ is prioritised over the instruction
abort. Whilst an attacker would need to get the stars to align here,
it might be sufficient with enough calibration so perform BP hardening
in the rare case that we see a kernel address in the ELR when handling
an IRQ from EL0.

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 17:31:40 +00:00 • committed by Greg Kroah-Hartman

parent 6b47a8256a

commit 48c3538c35

2 changed files with 11 additions and 0 deletions

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5

arch/arm64/kernel/entry.S

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6

arch/arm64/mm/fault.c

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