linux-kernel - Re: [PATCH v2 1/3] init/main.c: Give init

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Message-ID: <20140911144738.GE12612@atomlin.usersys.redhat.com>
Date:	Thu, 11 Sep 2014 15:47:38 +0100
From:	Aaron Tomlin <atomlin@...hat.com>
To:	Chuck Ebbert <cebbert.lkml@...il.com>
Cc:	peterz@...radead.org, mingo@...hat.com, dzickus@...hat.com,
	bmr@...hat.com, jcastillo@...hat.com, oleg@...hat.com,
	pzijlstr@...hat.com, riel@...hat.com, prarit@...hat.com,
	jgh@...hat.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	x86@...nel.org, rostedt@...dmis.org, hannes@...xchg.org,
	aneesh.kumar@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	akpm@...gle.com, linuxppc-dev@...ts.ozlabs.org, minchan@...nel.org
Subject: Re: [PATCH v2 1/3] init/main.c: Give init_task a canary

On Thu, Sep 11, 2014 at 07:23:45AM -0500, Chuck Ebbert wrote:
> On Wed, 10 Sep 2014 14:29:33 +0100
> Aaron Tomlin <atomlin@...hat.com> wrote:
> 
> > On Wed, Sep 10, 2014 at 02:26:54AM -0500, Chuck Ebbert wrote:
> > > And has this been tested on parisc and metag, which use STACK_GROWSUP ?
> > > I can't see how end_of_stack() as it's defined now could work on those archs.
> > 
> > AFAIU, dup_task_struct() has always done this explicitly.
> > I see no reason why init_task requires special attention.
> > 
> 
> I guess what I'm saying is, I can't see how the stack canary could have ever
> detected any problems on parisc and metag. How did you test your patches on x86?

Yes - under x86 only.

> Maybe someone could run tests on those other archs.

As I said, I can't see why it wouldn't work given
dup_task_struct()'s behaviour.

-- 
Aaron Tomlin
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