linux-stable.git/arch/arm64/kernel/ssbd.c, branch linux-5.2.y Linux kernel stable tree arm64: ssbd: explicitly depend on <linux/prctl.h> 2019-06-17T17:38:10+00:00 Anisse Astier aastier@freebox.fr 2019-06-17T13:22:21+00:00 adeaa21a4b6954e878f3f7d1c5659ed9c1fe567a Fix ssbd.c which depends implicitly on asm/ptrace.h including linux/prctl.h (through for example linux/compat.h, then linux/time.h, linux/seqlock.h, linux/spinlock.h and linux/irqflags.h), and uses PR_SPEC* defines. This is an issue since we'll soon be removing the include from asm/ptrace.h. Fixes: 9cdc0108baa8 ("arm64: ssbd: Add prctl interface for per-thread mitigation") Cc: stable@vger.kernel.org Signed-off-by: Anisse Astier <aastier@freebox.fr> Signed-off-by: Will Deacon <will.deacon@arm.com> 
Fix ssbd.c which depends implicitly on asm/ptrace.h including
linux/prctl.h (through for example linux/compat.h, then linux/time.h,
linux/seqlock.h, linux/spinlock.h and linux/irqflags.h), and uses
PR_SPEC* defines.

This is an issue since we'll soon be removing the include from
asm/ptrace.h.

Fixes: 9cdc0108baa8 ("arm64: ssbd: Add prctl interface for per-thread mitigation")
Cc: stable@vger.kernel.org
Signed-off-by: Anisse Astier <aastier@freebox.fr>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3 2018-09-14T16:46:19+00:00 Will Deacon will.deacon@arm.com 2018-08-07T12:47:06+00:00 8f04e8e6e29c93421a95b61cad62e3918425eac7 On CPUs with support for PSTATE.SSBS, the kernel can toggle the SSBD state without needing to call into firmware. This patch hooks into the existing SSBD infrastructure so that SSBS is used on CPUs that support it, but it's all made horribly complicated by the very real possibility of big/little systems that don't uniformly provide the new capability. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
On CPUs with support for PSTATE.SSBS, the kernel can toggle the SSBD
state without needing to call into firmware.

This patch hooks into the existing SSBD infrastructure so that SSBS is
used on CPUs that support it, but it's all made horribly complicated by
the very real possibility of big/little systems that don't uniformly
provide the new capability.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: ssbd: Drop #ifdefs for PR_SPEC_STORE_BYPASS 2018-09-14T16:46:15+00:00 Will Deacon will.deacon@arm.com 2018-06-15T10:50:42+00:00 2d1b2a91d56b19636b740ea70c8399d1df249f20 Now that we're all merged nicely into mainline, there's no need to check to see if PR_SPEC_STORE_BYPASS is defined. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 
Now that we're all merged nicely into mainline, there's no need to check
to see if PR_SPEC_STORE_BYPASS is defined.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arm64: ssbd: Add prctl interface for per-thread mitigation 2018-05-31T17:00:52+00:00 Marc Zyngier marc.zyngier@arm.com 2018-05-29T12:11:14+00:00 9cdc0108baa8ef87c76ed834619886a46bd70cbe 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> 
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>