|THM Room: Hardening basics|
Configuring access control
Protecting sensitive files and directories by setting proper permissions and ownership, and by using Extended Attributes (xattr).
Avoiding security related problems with Set User ID (SUID) and Set Group ID (SGID).
Access control lists (ACL) and shared directory management (SDM)
|Mastering Linux Security and Hardening, Donald A. Tevault, Second Edition|