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| author | Will Deacon <will.deacon@arm.com> | 2018-01-03 12:17:58 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-01-08 19:45:25 +0100 |
| commit | 0f15adbb2861ce6f75ccfc5a92b19eae0ef327d0 (patch) | |
| tree | 918eadd8cc51a5c04e2c9d4e657a4fec8f4b29d4 /arch/arm64/include/asm/cpucaps.h | |
| parent | arm64: Move post_ttbr_update_workaround to C code (diff) | |
| download | linux-0f15adbb2861ce6f75ccfc5a92b19eae0ef327d0.tar.xz linux-0f15adbb2861ce6f75ccfc5a92b19eae0ef327d0.zip | |
arm64: Add skeleton to harden the branch predictor against aliasing attacks
Aliasing attacks against CPU branch predictors can allow an attacker to
redirect speculative control flow on some CPUs and potentially divulge
information from one context to another.
This patch adds initial skeleton code behind a new Kconfig option to
enable implementation-specific mitigations against these attacks for
CPUs that are affected.
Co-developed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpucaps.h')
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index b4537ffd1018..51616e77fe6b 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -42,7 +42,8 @@ #define ARM64_HAS_DCPOP 21 #define ARM64_SVE 22 #define ARM64_UNMAP_KERNEL_AT_EL0 23 +#define ARM64_HARDEN_BRANCH_PREDICTOR 24 -#define ARM64_NCAPS 24 +#define ARM64_NCAPS 25 #endif /* __ASM_CPUCAPS_H */ |