Date: Mon, 24 Oct 2011 15:56:44 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: CVE Request -- kernel: ext4: ext4_ext_insert_extent() kernel oops On 10/21/2011 09:24 PM, Petr Matousek wrote: > A flaw was found in the way splitting two extents in > ext4_ext_convert_to_initialized() worked. Althrough ex has been updated > in memory, it is not dirtied both in ext4_ext_convert_to_initialized() > and ext4_ext_insert_extent(). The disk layout is corrupted. Then it > will meet with a BUG_ON() when writting at the start of that extent > again. > > Local unprivileged users can use this flaw to crash the system when ext4 > filesystem is in use. > > Introduced in: > 56055d3ae4cc7fa6d2b10885f20269de8a989ed7 > > Upstream fix: > 667eff35a1f56fa74ce98a0c7c29a40adc1ba4e3 > > Credits: > Zheng Liu > > References: > https://bugzilla.redhat.com/show_bug.cgi?id=747942 > > Thanks, Use CVE-2011-3638. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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