The Hardened Gentoo Glossary breifly explains the several technologies that make up Hardened Gentoo.

SELinux is a system of mandatory access controls. SELinux can enforce the security policy over all processes and objects in the system. The following documents will help you to build a new SELinux-enabled system, or to convert an existing system, and get up to speed with the basics of SELinux policies.

The SELinux x86 Install Guide provides a step-by-step explanation on how to install and configure a new system using SELinux.

The SELinux QuickStart Guide includes instructions on converting your existing Gentoo install to SELinux.

The SELinux Policy Overview covers the basics of working with SELinux policies.

The SELinux FAQ answers many frequently asked questions and has solutions for common pitfalls.

RSBAC is Mandatory Access Control security system based on the Role Compatibility model. It can enforce access rules on your operating system.

The RSBAC Overview is a glossary that establishes a basic understanding of RSBAC-related concepts.

The RSBAC Quickstart covers converting an existing system to RSBAC.

PaX is a combination of technologies that enable comprehensive memory protection in Linux. The following docs cover both the PaX kernel and complementary userland technologies.

The PaX Howto helps to get a system up and running with a PaX kernel and PIE/SSP userland.