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

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Message-ID: <681a2835-1a70-f3c3-3534-7b4cf6139cac@arm.com>
Date:   Fri, 4 Jan 2019 09:21:30 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Pavel Machek <pavel@....cz>,
        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>,
        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 03/01/2019 20:29, Pavel Machek wrote:
> 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" ...

... until you realize that these names do match the documentation,
which makes it even easier to understand how the code uses the
architecture.

	M.
-- 
Jazz is not dead. It just smells funny...