Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Wed, 4 Jul 2012 09:19:50 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE Request -- kernel: epoll: can leak file descriptors when
 returning -ELOOP

An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
circular epoll dependencies from being created.  However, in that case
we do not properly clear the 'tfile_check_list'.

An unprivileged local user could use this flaw to crash the system.

Regression introduced via 28d82dc1c4edbc352129f97f4ca22624d1fe61de
commit.

Upstream fix:
13d518074a952d33d47c428419693f63389547e9

References:
https://lkml.org/lkml/2012/3/27/65
https://lkml.org/lkml/2012/4/17/247
https://bugzilla.redhat.com/show_bug.cgi?id=837502

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.