arm64: Implement branch predictor hardening for affected Cortex-A CPUs

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Commit aa6acde65e upstream.

Cortex-A57, A72, A73 and A75 are susceptible to branch predictor aliasing
and can theoretically be attacked by malicious code.

This patch implements a PSCI-based mitigation for these CPUs when available.
The call into firmware will invalidate the branch predictor state, preventing
any malicious entries from affecting other victim contexts.

Co-developed-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 2018-01-03 12:46:21 +00:00 • committed by Greg Kroah-Hartman

parent 3317097b2b

commit 48993dfa1a

2 changed files with 66 additions and 0 deletions

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24

arch/arm64/kernel/bpi.S

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42

arch/arm64/kernel/cpu_errata.c

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