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SubjectRe: [PATCH 10/14] arm64: ssbd: Add prctl interface for per-thread mitigation
On Tue, 22 May 2018 16:48:42 +0100,
Dominik Brodowski wrote:
>
>
> On Tue, May 22, 2018 at 04:06:44PM +0100, Marc Zyngier wrote:
> > 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.
> >
> > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> > ---
> > arch/arm64/kernel/Makefile | 1 +
> > arch/arm64/kernel/ssbd.c | 107 +++++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 108 insertions(+)
> > create mode 100644 arch/arm64/kernel/ssbd.c
> >
> > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> > index bf825f38d206..0025f8691046 100644
> > --- a/arch/arm64/kernel/Makefile
> > +++ b/arch/arm64/kernel/Makefile
> > @@ -54,6 +54,7 @@ arm64-obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o
> > arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
> > arm64-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
> > arm64-obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o
> > +arm64-obj-$(CONFIG_ARM64_SSBD) += ssbd.o
> >
> > obj-y += $(arm64-obj-y) vdso/ probes/
> > obj-m += $(arm64-obj-m)
> > diff --git a/arch/arm64/kernel/ssbd.c b/arch/arm64/kernel/ssbd.c
> > new file mode 100644
> > index 000000000000..34e3c430176b
> > --- /dev/null
> > +++ b/arch/arm64/kernel/ssbd.c
> > @@ -0,0 +1,107 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2018 ARM Ltd, All Rights Reserved.
> > + */
> > +
> > +#include <linux/sched.h>
> > +#include <linux/thread_info.h>
> > +
> > +#include <asm/cpufeature.h>
> > +
> > +/*
> > + * prctl interface for SSBD
> > + * FIXME: Drop the below ifdefery once the common interface has been merged.
> > + */
> > +#ifdef PR_SPEC_STORE_BYPASS
>
> That FIXME wants to be looked at.

It is what allowed the series to compile with mainline until last
night. Once I rebase on top of -rc7, I'll remove it.

Thanks,

M.

--
Jazz is not dead, it just smell funny.

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