Linux Security Modules

1. LSM admin guide

   Index of in-tree Linux Security Modules.

2. SELinux

   SELinux enforcement, policy and booleans.

3. AppArmor

   Path-based confinement profiles.

4. Yama

   Yama ptrace_scope levels restricting which processes may attach to others with ptrace.

5. LSM kernel hooks

   Security hooks, blobs and stacking.

6. Landlock

   Unprivileged sandboxing with rulesets and access rights.

7. Seccomp BPF

   System call filtering with BPF filters.

8. Credentials

   Task credentials, uid, gid and capabilities.

9. Kernel keyrings

   Key retention service and keyrings.

10. Self-protection

    Kernel hardening features such as KASLR and stack protection.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.