A set of Linux kernel security-oriented patches implementing, among others, least privilege control for memory pages and other resources.

Grsecurity can be viewed as an extra way of hardening Linux kernel with in mind. An official guide to grsecurity can be found at https://en.wikibooks.org/wiki/Grsecurity.

Grsecurity's authors do not accept the mainstream Linux development approach of writing Linux Security Modules (LSMs) (, , TOMOYO, etc.).