Terminology Index

Glossary

33 terms starting with "G"

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GID

Group ID: the numeric identifier for a group on a Linux/Unix system, used alongside the user ID to determine a process's group membership and the file permissions and privileges it has.

On Linux, every user belongs to groups identified by numeric GIDs, and a process carries a group identity that, with its UID, governs what files and resources it can access. Understanding GIDs helps defenders interpret a process's privileges and security context, investigate permission-related activity, and spot abuse such as a process running with an unexpected group or exploiting set-group-ID (SGID) binaries for escalation.

Introduced in: Operating Systems for Defenders

Examples

  • A process's group membership determined by its GID affecting file access.
  • Investigating why a process can read a file by checking its group ID.
  • Recognizing an SGID binary that runs with a privileged group's GID.

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