SystemTap is an instrumentation system for systems running the Linuxkernel, version 2.6. Developers can write scripts to collect data on theoperation of the system. staprun, the SystemTap runtime tool, is used formanaging SystemTap kernel modules (for example, loading them).It was discovered that staprun did not properly sanitize the environmentbefore executing the modprobe command to load an additional kernel module.A local, unprivileged user could use this flaw to escalate theirprivileges. (CVE-2010-4170)It was discovered that staprun did not check if the module to be unloadedwas previously loaded by SystemTap. A local, unprivileged user could usethis 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 mustbe 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 containbackported patches to correct these issues.