Date: Tue, 27 Apr 2010 20:11:10 -0400 (EDT) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: coley@...us.mitre.org Subject: Re: CVE request - kernel: find_keyring_by_name() can gain the freed keyring Please use CVE-2010-1437 Thanks. -- JB ----- "Eugene Teo" <eugene@...hat.com> wrote: > Reported by Toshiyuki Okajima. find_keyring_by_name() can gain the > keyring which has been already freed. And then, its space (which is > gained by find_keyring_by_name()) is broken by accessing the freed > keyring as the available keyring: > > 1) If the space of the freed keyring is reallocated for other purpose > > (ie. filp SLUB), the data of the filp object may be destroyed by the > user of the freed keyring. (SLUB configuration can share the freed > space > with other same-size slabs.) > > 2) If the slab space of the freed keyring is released into the system, > > the system panic may happen because accessing the space of the freed > keyring causes the page-fault. > > Example: (we can easily confirm this problem if CONFIG_SLUB is "y".) >  with CONFIG_SLUB_DEBUG_ON > While we are executing my reproducer (which is attached), we can > notice > that the user of the freed keyring breaks its space: > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > # ./reproducer & > ... > # dmesg > ... > ============================================================================= > BUG key_jar: Poison overwritten > [...] > > More info: > http://www.gossamer-threads.com/lists/linux/kernel/1216391 > https://patchwork.kernel.org/patch/94038/ > https://bugzilla.redhat.com/show_bug.cgi?id=585094 > > Thanks, Eugene
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