Hardened Gentoo

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Hardened Gentoo is a project of Gentoo Linux that is enhancing the distribution with security addons. Current security enhancements to Gentoo Linux can be (not mutually exclusive if not noted otherwise):

SELinux
- A system of mandatory access controls. SELinux can enforce the security policy over all processes and objects in the system, and is an optional feature in all 2.6 kernel source packages.
RSBAC
- A mandatory access control security system based on Generalized Framework for Access Control (GFAC). It provides several standard and custom (and mixables) access control models. It can enforce operating system access rules.
PaX/grsecurity
- grsecurity is a complete security solution providing such features as a MAC or RBAC system, chroot restrictions, address space modification protection (via PaX), auditing features, randomization features, linking restrictions to prevent file race conditions, ipc protections and much more.
Hardened Toolchain
- Transparent implementation of PaX address space layout randomizations and stack smashing protections using ELF shared objects as executables.
sys-kernel/hardened-sources
- A kernel source package which includes patches for hardened subprojects, and stability/security-oriented patches, including Grsecurity.
Bastille Linux
- Bastille Linux is an interactive application which gives the user suggestions on securing their machine. It will be customized to make suggestions about other Hardened Gentoo subprojects.

The Mandatory Access Control (MAC) parts of SELinux, RSBAC and grsecurity are usually incompatible to each other. However, the chroot and network restrictions of grsecurity and the memory protection of PaX can be used with the SELinux MAC model for example.