linux-kernel - Re: [PATCH V3] limit minixfs printks on corrupted dir i

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Date:	Wed, 15 Aug 2007 09:59:34 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Bodo Eggert <7eggert@....de>
CC:	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	security@...nel.org
Subject: Re: [PATCH V3] limit minixfs printks on corrupted dir i_size, CVE-2006-6058

Bodo Eggert wrote:

>> Ok, do you like this slightly better?  It states the subsystem, the 
>> function with the error, the block nr. in the case of a too-large block,
>> and the block device on which the error occurred.
> 
> - how long is BDEVNAME_SIZE? Will it fit on the stack?

#define BDEVNAME_SIZE   32      /* Largest string for a blockdev
identifier */

~60 other users in md, ext3, jbd, buffer.c, etc. place it on the stack...

> - Does it include thespace for \0?

bdevname calls disk_name which does snprintf(buf, BDEVNAME_SIZE, ...),
so yes.

-Eric

> I asume you copied other users, and the other users will do it right (or 
> at least not terribly wrong:), but I can't dig the code right now.
> 
>>  Honestly minix.fsck
>> doesn't handle the situation well either, so at this point I hesitate
>> to recommend it in the print.  :)
> 
> *g*

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