grsecurity vs SELinux

grsecurity is a Linux kernel security enhancement that provides additional security features such as address space protection, valuable auditing for compliance, proactive security features to harden systems against potential attacks, and more.

SELinux (Security-Enhanced Linux) is a Linux kernel security module that provides a mechanism for supporting access control security policies. It is designed to enhance the security of Linux systems by allowing administrators to have more control over who can access the system.