linux-kernel - Re: [RFC 12/17] arm64: move ptrauth keys to thread

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Message-ID: <20181019113820.jly74g2kk3cxf3yp@mbp>
Date:   Fri, 19 Oct 2018 12:38:21 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        linux-arch@...r.kernel.org, Andrew Jones <drjones@...hat.com>,
        Jacob Bramley <jacob.bramley@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Adam Wallis <awallis@...eaurora.org>,
        "Suzuki K . Poulose" <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        kvmarm@...ts.cs.columbia.edu,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        Amit Kachhap <Amit.Kachhap@....com>,
        Dave P Martin <Dave.Martin@....com>,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [RFC 12/17] arm64: move ptrauth keys to thread_info

On Fri, Oct 05, 2018 at 09:47:49AM +0100, Kristina Martsenko wrote:
> From: Mark Rutland <mark.rutland@....com>
> 
> To use pointer authentication in the kernel, we'll need to switch keys
> in the entry assembly. This patch moves the pointer auth keys into
> thread_info to make this possible.
> 
> There should be no functional change as a result of this patch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>

Can we actually fold this into patch 7? It also leaves the door open to
allowing per-thread keys.

-- 
Catalin