Linux — Process Permissions

Tony
4 min readFeb 26, 2024

In Linux, understanding the concept of user identities (UIDs) is crucial for ensuring both security and appropriate access controls. There are several types of UIDs that Linux utilizes to manage process permissions: Real UID (RUID), Effective UID (EUID), Saved Set-User-ID (SUID), and Filesystem UID (FSUID). Each of these IDs plays a specific role in determining how a process interacts with the operating system and accesses resources.

--

--