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

From: Segher Boessenkool <[email-masked]>
Date: Mon, 17 Sep 2018 11:49:11 -0500

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