linux-ext4 - Re: [PATCH 1/2] ext4: check EA value offset when loading

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Message-ID: <20140916184116.GJ6205@thunk.org>
Date:	Tue, 16 Sep 2014 14:41:16 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: check EA value offset when loading

On Sun, Sep 14, 2014 at 10:32:59AM -0700, Darrick J. Wong wrote:
> When loading extended attributes, check each entry's value offset to
> make sure it doesn't collide with the entries.
> 
> Without this check it is easy to crash the kernel by mounting a
> malicious FS containing a file with an EA wherein e_value_offs = 0 and
> e_value_size > 0 and then deleting the EA, which corrupts the name
> list.
> 
> (See the f_ea_value_crash test's FS image in e2fsprogs for an example.)
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks, applied.

					- Ted
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