First published: Wed Sep 08 2010(Updated: )
Description of problem: It requires debugfs to be mounted on a local system $ mount | grep debugfs none on /sys/kernel/debug type debugfs (rw) none on /var/lib/ureadahead/debugfs type debugfs (rw,relatime) Tested with Ubuntu Maverick 10.04.1 with kernel 2.6.32-24-generic-pae. It's probably not exploitable in any meaningful way, although it produces page fault in kernel mode, and makes subsequent processes opening /sys/kernel/debug/tracing/set_ftrace_filter (or set_ftrace_notrace) unkillable, so it's a little bit of a DoS (or at least, annoyance). Found via one of Tavis Ormandy's tools, I just quickly analyzed it and provided a testcase. Acknowledgements: Red Hat would like to thank Robert Swiecki of Google Security Team for reporting this issue.
Credit: secalert@redhat.com secalert@redhat.com
Affected Software | Affected Version | How to fix |
---|---|---|
debian/linux-2.6 | ||
Linux Linux kernel | <2.6.35.5 | |
Canonical Ubuntu Linux | =9.10 | |
Canonical Ubuntu Linux | =10.04 | |
Canonical Ubuntu Linux | =10.10 | |
SUSE Linux Enterprise Desktop | =11 | |
Suse Linux Enterprise High Availability Extension | =11-sp1 | |
SUSE Linux Enterprise Server | =11 |
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.