Translations:Kernel/Overview/12/en
From Gentoo Wiki
The sys-kernel/hardened-sources kernel was based on the official Linux kernel and was targeted at users running Gentoo on server systems. It once provided patches for the various sub-projects of Gentoo Hardened (such as support for SELinux and grsecurity), together with stability and security-enhancements. Check out the Hardened project here on the wiki for more information.