linux-kernel - Re: Wanted: simple, safe x86 stack overflow detection

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Message-Id: <200703050218.25028.arnd@arndb.de>
Date:	Mon, 5 Mar 2007 02:18:24 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andreas Krebbel <krebbel1@...ibm.com>
Subject: Re: Wanted: simple, safe x86 stack overflow detection

On Wednesday 28 February 2007, Chuck Ebbert wrote:
> Can we just put a canary in the threadinfo and check it on every
> task switch? What are the drawbacks?

It's not completely reliable, in case of functions that allocate
far too much stack space. You might want to take a look at the
gcc support that Andreas Krebbel implemented for s390 to check
for stack overflows:

http://gcc.gnu.org/ml/gcc-patches/2004-08/msg01308.html

I think there are some additions planned for the next gcc release,
but if you port this to i386, it will get you pretty far.

	Arnd <><
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