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From:   Will Deacon <will@kernel.org>
To:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Boyan Karatotev <boian4o1@gmail.com>
Cc:     catalin.marinas@arm.com, kernel-team@android.com,
        Will Deacon <will@kernel.org>,
        Vincenzo Frascino <Vincenzo.Frascino@arm.com>,
        Shuah Khan <skhan@linuxfoundation.org>,
        Shuah Khan <shuah@kernel.org>,
        Amit Daniel Kachhap <amit.kachhap@arm.com>,
        Boyan Karatotev <boyan.karatotev@arm.com>
Subject: Re: [PATCH v3 0/4] kselftests/arm64: add PAuth tests
Date:   Fri, 18 Sep 2020 17:17:12 +0100
Message-Id: <160043444117.3782204.2915694292164930857.b4-ty@kernel.org>
In-Reply-To: <20200918104715.182310-1-boian4o1@gmail.com>
References: <20200918104715.182310-1-boian4o1@gmail.com>
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On Fri, 18 Sep 2020 11:47:11 +0100, Boyan Karatotev wrote:
> Pointer Authentication (PAuth) is a security feature introduced in ARMv8.3.
> It introduces instructions to sign addresses and later check for potential
> corruption using a second modifier value and one of a set of keys. The
> signature, in the form of the Pointer Authentication Code (PAC), is stored
> in some of the top unused bits of the virtual address (e.g. [54: 49] if
> TBID0 is enabled and TnSZ is set to use a 48 bit VA space). A set of
> controls are present to enable/disable groups of instructions (which use
> certain keys) for compatibility with libraries that do not utilize the
> feature. PAuth is used to verify the integrity of return addresses on the
> stack with less memory than the stack canary.
> 
> [...]

Applied to arm64 (for-next/selftests), thanks!

[1/4] kselftests/arm64: add a basic Pointer Authentication test
      https://git.kernel.org/arm64/c/e74e1d557285
[2/4] kselftests/arm64: add nop checks for PAuth tests
      https://git.kernel.org/arm64/c/766d95b1ed93
[3/4] kselftests/arm64: add PAuth test for whether exec() changes keys
      https://git.kernel.org/arm64/c/806a15b2545e
[4/4] kselftests/arm64: add PAuth tests for single threaded consistency and differently initialized keys
      https://git.kernel.org/arm64/c/d21435e9670b

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev