linux-ext4 - Re: [Bug 9855] ext3 ACL corruption

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Message-Id: <1202200946.4280.4.camel@kulgan.wumi.org.au>
Date:	Tue, 05 Feb 2008 19:12:26 +1030
From:	Kevin Shanahan <kmshanah@...b.org.au>
To:	Andreas Dilger <adilger@....com>
Cc:	linux-ext4@...r.kernel.org, Andreas Gruenbacher <agruen@...e.de>,
	bugme-daemon@...zilla.kernel.org, Theodore Ts'o <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Bug 9855] ext3 ACL corruption

On Mon, 2008-02-04 at 18:06 -0700, Andreas Dilger wrote:
> Hmm, I wonder if e2fsck is calculating the wrong file offset or something?
> The kernel appears to be taking the EA data offset from the end of
> i_extra_isize and the ext3_xattr_ibody_header fields (so 0x88 + e_value_offs
> from the start of the inode).
> 
> Conversely, debugfs isn't having any problem with this EA at all.
> 
> h, I think I see the problem, and this was fixed in newer e2fsck.
> The EAs are stored "out of order" in the inode and older e2fsprogs
> considered that an error.  That was fixed in the final 1.40 release:
> 
> 	Remove check in e2fsck which requires EA's in inodes to be sorted;
> 	they don't need to be sorted, and e2fsck was previously wrongly
> 	clearing unsorted EA's stored in the inode structure.

Ah, I think you got it! I've just now reproduced the problem on one
filesystem with the old e2fsck-1.40-WIP from Debian Etch and then
checked again with the newer e2fsck-1.40.5 from Sid. The new version
doesn't report any problems.

Thanks very much for your time looking into this.

Regards,
Kevin.


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