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

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Message-ID: <20140910132933.GG1436@atomlin.usersys.redhat.com>
Date:	Wed, 10 Sep 2014 14:29:33 +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 Wed, Sep 10, 2014 at 02:26:54AM -0500, Chuck Ebbert wrote:
> On Tue,  9 Sep 2014 10:42:27 +0100
> Aaron Tomlin <atomlin@...hat.com> wrote:
> 
> > +void task_stack_end_magic(struct task_struct *tsk)
> > +{
> > +	unsigned long *stackend;
> > +
> > +	stackend = end_of_stack(tsk);
> > +	*stackend = STACK_END_MAGIC;	/* for overflow detection */
> > +}
> > +
> 
> For clarity this should probably be called set_task_stack_end_magic().

Agreed.

> 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.

-- 
Aaron Tomlin
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