systemtap security update

CentOS Errata and Security Advisory CESA-2010:0894

SystemTap is an instrumentation system for systems running the Linux
kernel, version 2.6. Developers can write scripts to collect data on the
operation of the system. staprun, the SystemTap runtime tool, is used for
managing SystemTap kernel modules (for example, loading them).

It was discovered that staprun did not properly sanitize the environment
before executing the modprobe command to load an additional kernel module.
A local, unprivileged user could use this flaw to escalate their
privileges. (CVE-2010-4170)

It was discovered that staprun did not check if the module to be unloaded
was previously loaded by SystemTap. A local, unprivileged user could use
this flaw to unload an arbitrary kernel module that was not in use.
(CVE-2010-4171)

Note: After installing this update, users already in the stapdev group must
be added to the stapusr group in order to be able to run the staprun tool.

Red Hat would like to thank Tavis Ormandy for reporting these issues.

SystemTap users should upgrade to these updated packages, which contain
backported patches to correct these issues.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2010-November/079347.html
https://lists.centos.org/pipermail/centos-announce/2010-November/079348.html

Affected packages:
systemtap
systemtap-client
systemtap-initscript
systemtap-runtime
systemtap-sdt-devel
systemtap-server
systemtap-testsuite

Upstream details at:
https://access.redhat.com/errata/RHSA-2010:0894