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| author | Mark Rutland <mark.rutland@arm.com> | 2018-12-07 18:39:25 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-13 16:42:46 +0000 |
| commit | 7503197562567b57ec14feb3a9d5400ebc56812f (patch) | |
| tree | 1cf09bc7b7ddac120bb8803735f0b2d3826bdc47 /arch/arm64/include/uapi | |
| parent | 6984eb47d5c1a74bb44467ee4eee22d680f10785 (diff) | |
| download | linux-7503197562567b57ec14feb3a9d5400ebc56812f.tar.gz linux-7503197562567b57ec14feb3a9d5400ebc56812f.tar.bz2 linux-7503197562567b57ec14feb3a9d5400ebc56812f.zip | |
arm64: add basic pointer authentication support
This patch adds basic support for pointer authentication, allowing
userspace to make use of APIAKey, APIBKey, APDAKey, APDBKey, and
APGAKey. The kernel maintains key values for each process (shared by all
threads within), which are initialised to random values at exec() time.
The ID_AA64ISAR1_EL1.{APA,API,GPA,GPI} fields are exposed to userspace,
to describe that pointer authentication instructions are available and
that the kernel is managing the keys. Two new hwcaps are added for the
same reason: PACA (for address authentication) and PACG (for generic
authentication).
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Tested-by: Adam Wallis <awallis@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
[will: Fix sizeof() usage and unroll address key initialisation]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/uapi')
| -rw-r--r-- | arch/arm64/include/uapi/asm/hwcap.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index 7784f7cba16c..5f0750c2199c 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -50,5 +50,7 @@ #define HWCAP_FLAGM (1 << 27) #define HWCAP_SSBS (1 << 28) #define HWCAP_SB (1 << 29) +#define HWCAP_PACA (1 << 30) +#define HWCAP_PACG (1UL << 31) #endif /* _UAPI__ASM_HWCAP_H */ |