Kernel Documentation: Security
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Official Linux kernel security docs
More resources on Operating System Security
Grsecurity
Linux kernel security enhancements
SELinux Project
Mandatory Access Control for Linux
LiveOverflow: Introduction to Binary Exploitation
Series on OS-level security exploits and mitigations
Computer Systems Security
Explore operating system security with Nick Weaver's Computer Systems Security course. Learn to build robust, secure systems!
owasp.org
OWASP is a nonprofit devoted to improving software and web application security, offering free, open resources such as the OWASP Top Ten, secure coding guidelines, testing guides, and community projects.
geeksforgeeks.org
GeeksforGeeks is a comprehensive computer science learning site offering tutorials, explanations, and coding practice across topics including operating systems and security. It features step-by-step guides, examples, and interview-ready articles on OS concepts, security fundamentals, and related programming topics.