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

From: Segher Boessenkool
Date: Mon Sep 17 2018 - 12:50:01 EST


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