arm64: ssbd: Introduce thread flag to control userspace mitigation

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In order to allow userspace to be mitigated on demand, let's
introduce a new thread flag that prevents the mitigation from
being turned off when exiting to userspace, and doesn't turn
it on on entry into the kernel (with the assumption that the
mitigation is always enabled in the kernel itself).

This will be used by a prctl interface introduced in a later
patch.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
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 13:11:13 +01:00 • committed by Catalin Marinas

parent 647d0519b5

commit 9dd9614f54

2 changed files with 3 additions and 0 deletions

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1

arch/arm64/include/asm/thread_info.h

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2

arch/arm64/kernel/entry.S

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