Re: [PATCH v6 07/13] arm64: add basic pointer authentication support

On 12/7/18 12:39 PM, Kristina Martsenko wrote:

From: Mark Rutland <mark.rutland@arm.com>

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).

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <redacted>
Tested-by: Adam Wallis <redacted>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ramana Radhakrishnan <redacted>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <redacted>
---
 arch/arm64/include/asm/pointer_auth.h | 75 +++++++++++++++++++++++++++++++++++
 arch/arm64/include/asm/thread_info.h  |  4 ++
 arch/arm64/include/uapi/asm/hwcap.h   |  2 +
 arch/arm64/kernel/cpufeature.c        | 13 ++++++
 arch/arm64/kernel/cpuinfo.c           |  2 +
 arch/arm64/kernel/process.c           |  4 ++
 6 files changed, 100 insertions(+)
 create mode 100644 arch/arm64/include/asm/pointer_auth.h

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~


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