linux-ext4 - Re: [PATCH] ext4: Make the extent validity check more paranoid

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Message-ID: <49F0648C.10407@redhat.com>
Date:	Thu, 23 Apr 2009 07:52:28 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Theodore Tso <tytso@....edu>
CC:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Make the extent validity check more paranoid

Theodore Tso wrote:
> On Wed, Apr 22, 2009 at 09:04:30PM -0500, Eric Sandeen wrote:
>> Theodore Ts'o wrote:
>>> Instead of just checking that the extent block number is greater or
>>> equal than s_first_data_block, make sure it it is not pointing into
>>> the block group descriptors, since that is clearly wrong.  This helps
>>> prevent filesystem from getting very badly corrupted in case an extent
>>> block is corrupted.
>>>
>>> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
>> Good idea.  Maybe we can get our friends with the corrupted fs to run
>> with these validation patches... I can get this into rawhide at least.
> 
> Yeah, unfortunately this patch requires some other patches that went
> in during the 2.6.30 merge window, so some extra back-porting would be
> needed for our friends running a 2.6.29.1 Fedora kernel.

Right, but rawhide has .30-etc, so a test on that might be helpful.

-Eric
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