NSA Security Enhanced Linux
Changes: The SELinux module has been merged into the mainline kernel as of 2.6.0-test3. This release includes new kernel patches based on the 2.6.0-test3 kernel and a backport of the 2.6 SELinux module to the 2.4.21 kernel. The new API is consistent between 2.4 and 2.6. The old 2.4 API and user-space utilities are no longer actively maintained. There have been a number of bug fixes and cleanups to the library and utilities, as well as new contributions to the example policy."