mailing list archives
CVE Request: linux-kernel priviledge escalation on ARM/perf
From: Vince Weaver <vincent.weaver () maine edu>
Date: Wed, 14 Aug 2013 17:37:32 -0400 (EDT)
I'm not really a security researcher, so hopefully I'm reporting this in
the proper way.
I have a fuzzer tool for the perf_event_open() syscall that found
a few oopses on the ARM platform, which I reported to lkml a week ago.
One of the oopses can lead to a local privilege escalation on ARM-perf.
This fix can be found here:
The discussion thread is:
The hope is this appears in 3.11-rc6 but my attempts to get the people at
security () vger kernel org to take this seriously didn't really go very
I do have code that will exploit the kernel and give me a root shell
on an ARM Pandaboard machine running 3.11-rc4. The exploit is a bit
+ Only works on ARM
+ Elevates from normal user to root, no special config required.
perf_event syscalls run as regular users, not sure why some
think you need root.
+ It does need a user-mappable address at an exact byte offset
from a pmu_struct in memory. This limits things somewhat; in
my testing 3.11-rc kernels have INT_MIN at exactly the right place
but the exploit doesn't work on a 3.7.6 kernel,
it just oopses or crashes the machine.
- CVE Request: linux-kernel priviledge escalation on ARM/perf Vince Weaver (Aug 14)