oss-security - CVE request: kernel: splice: fix bad unlock

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [day] [month] [year] [list]

Date: Tue, 16 Sep 2008 17:01:03 +0800
From: Eugene Teo <eteo@...hat.com>
To: oss-security@...ts.openwall.com
CC: coley@...re.org
Subject: CVE request: kernel: splice: fix bad unlock_page() in error case

Hi Steve,

This bug requires a CVE name. Please allocate one.

This upstream commit addressed a user triggerable DoS:
6a860c979b35469e4d77da781a96bdb2ca05ae64

Summary:
[PATCH] splice: fix bad unlock_page() in error case

If add_to_page_cache_lru() fails, the page will not be locked. But
splice jumps to an error path that does a page release and unlock,
causing a BUG() in unlock_page().

Reproducer:
http://lkml.org/lkml/2007/7/30/448
(different issue, but same reproducer)

References:
http://lkml.org/lkml/2007/7/20/168
https://bugzilla.redhat.com/show_bug.cgi?id=462434

Thanks, Eugene
-- 
Eugene Teo / Red Hat Security Response Team

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.