linux-kernel - Re: [PATCH 1/2] stackprotector: add stack smashing protector generic implementation

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Date:	Tue, 11 Jan 2011 16:56:02 +0100
From:	Carmelo AMOROSO <carmelo.amoroso@...com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Filippo ARCIDIACONO <filippo.arcidiacono@...com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"nicolas.pitre@...aro.org" <nicolas.pitre@...aro.org>,
	"nico@...xnic.net" <nico@...xnic.net>
Subject: Re: [PATCH 1/2] stackprotector: add stack smashing protector
 generic implementation

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On 1/11/2011 6:30 AM, Mike Frysinger wrote:
> what are you using to test this ? is there a simple strcpy or similar
> code you run as a kernel module that'll allow me to verify ?
> -mike
> 
Hi Mike,
yes, a simple kernel module with a init func that use strcpy or memcpy
to write over the boundaries of an local array variable is enough.
As you know, the array has to be larger than 8 bytes to match with the
gcc heuristic and generate the call to the guard.

Cheers,
Carmelo



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