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I’m going to write a code which will extensively execute other programs. I don’t want it to have root privileges if someone set a set-user-id bit(and root is an owner). So I’m going to drop privileges at startup.
My question is:
How can I understand from within the program whether it run in set-user-id mode?
You can compare result of
getuid()andgeteuid()library calls.If
geteuid()returns 0 (root), butgetuid()returns not 0, you can say that suid is active.