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Date: Fri, 15 Jul 2011 13:05:08 -0400 (EDT)
From: Josh Bressers <>
Cc: "Steven M. Christey" <>
Subject: Re: CVE Request -- kernel: ext4: kernel panic when
 writing data to the last block of sparse file

Please use CVE-2011-2695.



----- Original Message -----
> If an extent exists which includes the block right before the maximum
> file offset, and the block for the maximum file offset is written,
> the kernel panics. For 4KB block size, the problem only occurs on
> x86_64 architecture. For 1KB or 2KB block size, the problem occurs on
> both i386 and x86_64.
> Local unprivileged users can use this flaw to crash the system when
> ext4
> filesystem is in use.
> Upstream fix:
> f17722f917b2f21497deb6edc62fb1683daa08e6
> References:
> Thanks,
> --
> Petr Matousek / Red Hat Security Response Team

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