linux-kernel - Re: [3/3] use vmalloc() to arrange guard pages for stacks

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Message-ID: <463757A3.7010808@redhat.com>
Date:	Tue, 01 May 2007 11:07:15 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Bill Irwin <bill.irwin@...cle.com>, linux-kernel@...r.kernel.org,
	bunk@...sta.de, akpm@...l.org, gcoady@...il.com, zlynx@....org,
	dgc@....com, alan@...rguk.ukuu.org.uk, andi@...stfloor.org,
	hch@...radead.org, jengelh@...ux01.gwdg.de, zwane@...radead.org,
	neilb@...e.de, jens.axboe@...cle.com, eric@...venscaling.com
Subject: Re: [3/3] use vmalloc() to arrange guard pages for stacks

Bill Irwin wrote:
> This patch introduces CONFIG_DEBUG_STACK, which vmalloc()'s task and IRQ
> stacks in order to establish guard pages. In such a manner any stack
> overflow that references pages immediately adjacent to the stack is
> immediately trapped with a fault, which precludes silent memory corruption
> or difficult-to-decipher failure modes resulting from stack corruption.
> 

Is there a guard page below and above the stack? (I've seen stack underflow
before, as well as overflow.)
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