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Message-ID: <20121025064141.GT13903@dhcp-25-225.brq.redhat.com>
Date: Thu, 25 Oct 2012 08:41:41 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2012-4508 -- kernel: ext4: AIO vs fallocate stale data exposure
A race condition flaw has been found in the way asynchronous I/O and
fallocate interacted which can lead to exposure of stale data -- that
is, an extent which should have had the "uninitialized" bit set
indicating that its blocks have not yet been written and thus contain
data from a deleted file. An unprivileged local user could use this flaw
to cause an information leak.
Acknowledgements:
Red Hat would like to thank Theodore Tso for reporting this issue.
Upstream acknowledges Dmitry Monakhov as the original reporter.
Upstream fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=dee1f973ca341c266229faa5a1a5bb268bed3531
Please see https://bugzilla.redhat.com/show_bug.cgi?id=869904#c1 for
further information regarding the patch.
References:
https://bugzilla.redhat.com/show_bug.cgi?id=869904
Thanks,
--
Petr Matousek / Red Hat Security Response Team
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