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Subject: Re: [PATCH v6 07/13] arm64: add basic pointer authentication support
To:     Kristina Martsenko <kristina.martsenko@arm.com>,
        linux-arm-kernel@lists.infradead.org
Cc:     Adam Wallis <awallis@codeaurora.org>,
        Amit Kachhap <amit.kachhap@arm.com>,
        Andrew Jones <drjones@redhat.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christoffer Dall <christoffer.dall@arm.com>,
        Cyrill Gorcunov <gorcunov@gmail.com>,
        Dave P Martin <dave.martin@arm.com>,
        Jacob Bramley <jacob.bramley@arm.com>,
        Kees Cook <keescook@chromium.org>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
References: <20181207183931.4285-1-kristina.martsenko@arm.com>
 <20181207183931.4285-8-kristina.martsenko@arm.com>
From:   Richard Henderson <richard.henderson@linaro.org>
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Date:   Sun, 9 Dec 2018 08:59:42 -0600
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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 <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>
> ---
>  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~