grsecurity
grsecurity is a security enhancement patch for the Linux kernel that provides a comprehensive set of features to harden systems against various types of attacks, including memory corruption exploits and privilege escalation. It includes components like PaX (for memory protection), RBAC (Role-Based Access Control), and auditing tools to enforce strict security policies and reduce the attack surface of Linux systems.
Developers should learn and use grsecurity when building or maintaining high-security Linux systems, such as servers handling sensitive data, embedded devices, or environments requiring strict compliance (e.g., financial or government sectors). It is particularly valuable for mitigating zero-day vulnerabilities and implementing defense-in-depth strategies, as it adds proactive security measures beyond standard Linux kernel protections.