==Structure ==
grsecurity is a set of patches for the Linux kernel with an emphasis on enhancing security. It allows the system administrator to, among other things, define a least privilege policy for the system, in which every process and user have only the lowest privileges needed to function.
PaX is a patch for the Linux kernel that implements least privilege protections for memory pages.
RBAC is intended to restrict access to the system further than what is normally provided by Unix access control lists, with the aim of creating a fully least-privilege system, where users and processes have the absolute minimum privileges to work correctly and nothing more.
== Understand ==
