Date: Wed, 9 Oct 2002 17:45:48 -0400 (EDT) From: Mikhail Kruk <meshko@cs.brandeis.edu> To: <freebsd-questions@freebsd.org> Subject: setregid question Message-ID: <Pine.LNX.4.33.0210091741490.1237-100000@iole.cs.brandeis.edu>
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I have the following program:
main()
{
printf("uid: %d\n", getuid());
printf("euid: %d\n", geteuid());
system("/root/uid.sh");
setreuid(geteuid());
setregid(getegid());
printf("uid: %d\n", getuid());
printf("euid: %d\n", geteuid());
system("/root/uid.sh");
}
where uid.sh runs 'id' command.
I make executable
chown meshko a.out; chgrp meshko a.out ; chmod 6770 a.out
and when I run it I get the following output:
uid: 0
euid: 1001
uid=0(root) euid=1001(meshko) gid=0(wheel) egid=1001(meshko)
groups=1001(meshko), 0(wheel), 2(kmem), 3(sys), 4(tty), 5(operator),
20(staff), 31(guest)
uid: 1001
euid: 1001
uid=1001(meshko) gid=1001(meshko) groups=1001(meshko), 0(wheel), 2(kmem),
3(sys), 4(tty), 5(operator), 20(staff), 31(guest)
It seems to do everything the way I expect it, except for the printout of
the group membership. I'm trying to lower my real group id to my effective
group id, and gid output reflects the change, but I still get the list of
groups in which root it... How come?
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