Access rights for suid programs. - (nf)

[gwyn%brl-vld at sri-unix.UUCP]

From:      Doug Gwyn (VLD/VMB) <gwyn at brl-vld>

UNIX System V SCCS utilities rely on the UID rules you described to
permit a set-UID-to-archive-owner access interface program to allow
controlled access to SCCS archives.  Without the ability to change
effective UID back to the original set-UID value, z.* lock files cannot
be removed from the archive directory since at that point the process
has the real UID for its effective UID (to create extracted sources with
appropriate ownership).

I discovered this the hard way and am trying to figure out how to work
around the problem on the non-USG systems I have access to.