Grsecurity is a set of security patches to the 2.4 tree of Linux kernels. The goal of the project is to create the most secure system possible while requiring minimum configuration changes.

Provides Linux kernel extensions which allow system administrators to apply security patches to a running kernel without having to reboot the system.

The site provides a patch for extended attributes and access control lists for Linux kernel.

RSBAC is another MAC kernel security enhancement project for Linux. The standard package includes a range of access control models like MAC, RC, ACL. Additionally, the runtime registration facility (REG) makes it easy to implement your own access cont...

The Flask operating system security architecture provides flexible support for security policies. The architecture has previously been implemented in two research operating systems, Mach and Fluke, and is now being implemented in the Linux kernel.

The Linux Encryption-HOWTO seeks to describe all major development activities around Linux that provide encryption features to the kernel.

The main aim of the project is to introduce Mandatory Access Control (MAC) mechanism into Linux, based on capabilities, filesystem access domains, IP labeling lists and socket access control.