CVE-2012-4508: Race Condition

First published: Thu Oct 25 2012(Updated: )

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 Ts'o for reporting this issue. Upstream acknowledges Dmitry Monakhov as the original reporter. References: <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=dee1f973ca341c266229faa5a1a5bb268bed3531">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=dee1f973ca341c266229faa5a1a5bb268bed3531</a>

Credit: secalert@redhat.com secalert@redhat.com

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