arm64: ssbd: Add prctl interface for per-thread mitigation

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If running on a system that performs dynamic SSBD mitigation, allow
userspace to request the mitigation for itself. This is implemented
as a prctl call, allowing the mitigation to be enabled or disabled at
will for this particular thread.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Marc Zyngier 2018-05-29 13:11:14 +01:00 • committed by Catalin Marinas

parent 9dd9614f54

commit 9cdc0108ba

2 changed files with 111 additions and 0 deletions

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arch/arm64/kernel/Makefile

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110

arch/arm64/kernel/ssbd.c

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