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

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Message-ID: <20190103202901.GA21564@amd>
Date:   Thu, 3 Jan 2019 21:29:01 +0100
From:   Pavel Machek <pavel@....cz>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Adam Wallis <awallis@...eaurora.org>,
        Amit Kachhap <amit.kachhap@....com>,
        Andrew Jones <drjones@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave P Martin <dave.martin@....com>,
        Jacob Bramley <jacob.bramley@....com>,
        Kees Cook <keescook@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 07/13] arm64: add basic pointer authentication support

On Fri 2018-12-07 18:39:25, Kristina Martsenko wrote:
> From: Mark Rutland <mark.rutland@....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.

...

> +/*
> + * We give each process its own keys, which are shared by all threads. The keys
> + * are inherited upon fork(), and reinitialised upon exec*().
> + */
> +struct ptrauth_keys {
> +	struct ptrauth_key apia;
> +	struct ptrauth_key apib;
> +	struct ptrauth_key apda;
> +	struct ptrauth_key apdb;
> +	struct ptrauth_key apga;
> +};

intstruction_a, data_a, generic_a? Should be easier to understand than
"apdb" ...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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