linux-kernel - Re: [PATCH 2/2] powerpc/32: stack protector: change the canary value per task

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Message-ID: <20180917164911.GK23155@gate.crashing.org>
Date:   Mon, 17 Sep 2018 11:49:11 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc/32: stack protector: change the canary value per task

On Mon, Sep 17, 2018 at 12:15:08PM +0000, Christophe Leroy wrote:
>  I would have liked to use -mstack-protector-guard=tls -mstack-protector-guard-reg=r2
>  -mstack-protector-guard-offset=offsetof(struct task_struct, stack_canary) but I have
>  not found how set the value of offsetof(struct task_struct, stack_canary) in Makefile.

By far the easiest is to have the canary at a fixed offset from r2.


Segher