linux-kernel - Re: Simple script that locks up my box with recent kernels

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Date:	Wed, 22 Nov 2006 12:58:56 -0500
From:	Dave Jones <davej@...hat.com>
To:	Pádraig Brady <P@...igBrady.com>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: Simple script that locks up my box with recent kernels

On Wed, Nov 22, 2006 at 10:32:36AM +0000, Pádraig Brady wrote:

 > > Heh, it's amazing how commonplace that mistake is.
 > > Come back bzero, all is forgiven..
 > 
 > It's interesting to do the following on google codesearch
 > 
 > lang:^(c|c\+\+)$ memset\ *\(.*,\ *0\ *\);
 > http://tinyurl.com/y47qu4
 > 
 > lang:^(c|c\+\+)$ \sif\([^)]*\);
 > http://tinyurl.com/y4mdbl
 > 
 > It would be interesting to build
 > up a suite of these regular expressions.

A bunch of people already started gathering these a day
or so after codesearch launched..

http://asert.arbornetworks.com/2006/10/static-code-analysis-using-google-code-search/
is a good start.
http://www.cipher.org.uk/index.php?p=projects/bugle.project
is also somewhat interesting (but from a security bug standpoint only)

I've got some crufty shell scripts that I grew that I use
from time to time that just grep a bunch of patterns, I've had
"put them all together and make one decent one" on my todo
for a while. I'll see if I can get to it this week.
I've used these occasionally not just to find bugs in the kernel
but across a completely unpacked distro source tree.
Amazing what turns up sometimes.

		Dave

-- 
http://www.codemonkey.org.uk
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