Setuid

Setuid Binaries # ls -la /bin/su -rwsr-xr-x 1 root root 67816 Aug 1 20:00 /bin/su Types of permissions and actions 1. The Three Types of Users (Who) Linux divides the entire universe of users into three distinct categories. Permissions are always listed in this exact order: Owner (User): The specific person who owns the file (usually the creator). Group: A defined collection of users who share access (e.g., a “developers” or “finance” group). Others: Everyone else on the system who is not the owner and not in the group. The owner and group are stored in inode. ...