theurbanpenguin.com
Understanding Exec-Shield and NX Protection for LPIC-3 Linux Security
Another tool that Linux uses to protect against buffer overflow and similar exploits is Exec-Shield. In most modern systems this is enabled and cannot be managed via sysctl. However it may be disabled in the BIOS and we can check it is running. This will help you secure your systems and prepare for LPIC-3 303-200 exam