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>
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6984eb47