arm64: zero GPRs upon entry from EL0

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We can zero GPRs x0 - x29 upon entry from EL0 to make it harder for
userspace to control values consumed by speculative gadgets.

We don't blat x30, since this is stashed much later, and we'll blat it
before invoking C code.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Mark Rutland 2018-07-11 14:56:48 +01:00 • committed by Will Deacon

parent 99ed3ed08d

commit baaa7237fe

1 changed files with 7 additions and 1 deletions

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arch/arm64/kernel/entry.S

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