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Re: XFS information leak during crash

To: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Subject: Re: XFS information leak during crash
From: "Theodore Ts'o" <tytso@xxxxxxx>
Date: Thu, 3 Nov 2005 12:05:27 -0500
Cc: Nathan Scott <nathans@xxxxxxx>, Jan Kasprzak <kas@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxx
In-reply-to: <1131021949.18848.21.camel@localhost.localdomain>
Mail-followup-to: Theodore Ts'o <tytso@xxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>, Nathan Scott <nathans@xxxxxxx>, Jan Kasprzak <kas@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxx
References: <20051102212722.GC6759@fi.muni.cz> <20051103101107.O6239737@wobbly.melbourne.sgi.com> <20051102233629.GD6759@fi.muni.cz> <20051103104956.B6081538@wobbly.melbourne.sgi.com> <20051103000317.GE6759@fi.muni.cz> <20051103111115.C6081538@wobbly.melbourne.sgi.com> <1131021949.18848.21.camel@localhost.localdomain>
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On Thu, Nov 03, 2005 at 12:45:49PM +0000, Alan Cox wrote:
> On Iau, 2005-11-03 at 11:11 +1100, Nathan Scott wrote:
> > On Thu, Nov 03, 2005 at 01:03:17AM +0100, Jan Kasprzak wrote:
> > > : it would only ever be uninitialised, previously-free space.
> > > 
> > >   Yes, but an old data from previously deleted files
> > > (sendmail's temporary files, vim save files, etc) may contain
> > > a sensitive information.
> > 
> > Indeed.  But this is a generic issue affecting most filesystems;
> > its not specific to XFS as your original mail claimed.
> 
> Very true. You can use ext3 in data journalling mode if this is a
> concern but that guarantee has a performance cost

The default ordered journalling mode solves this problem at a much
lower cost.

                                                - Ted


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