Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

While troubleshooting why a regular user is able to modify /etc/shadow when running the passwd utility, you see that /usr/bin/passwd is owned by root and has the setuid bit set (mode 4755). When the binary executes, which user identifier does the Linux kernel actually evaluate to determine whether the process may write to /etc/shadow?

  • The saved UID (suid) recorded so the program can later drop privileges

  • The real UID (ruid) that belongs to the user who typed the command

  • The effective UID (euid) that changes to root because of the setuid bit

  • The file-system UID (fsuid) that stays equal to the invoking user's UID

CompTIA Linux+ XK0-006 (V8)
Services and User Management
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