Hard Links between UNIX Utility Programs

[Chris Torek]

It is not broken; please do not `fix' it.  If the goal is to prevent
programs from running with arbitrary arguments (including argv[0]),
then do that (via the available protection mechanisms, such as
groups).  For instance, if students should not be allowed remote
access to arbitrary hosts:

	% ls -lg /usr/ucb/rsh /usr/ucb/rlogin
	-rwsr-x---  1 root     ins         30720 Mar 15 11:31 /usr/ucb/rlogin
	-rwsr-x---  1 root     ins         28672 Sep  2  1987 /usr/ucb/rsh
	% ls -lg local_host
	-rwxr-sr-x  1 bin      ins        <size> <date, time> local_host
	% ls -l local_host remote_host
	lrwxrwxrwx  1 bin        12 Jun 11 04:13 remote_host -> /usr/ucb/rsh

where `local_host' is a link to a program that makes sure the arguments
are to be allowed to students, then runs /usr/ucb/rsh, and where `ins'
is a group that excludes students.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris at mimsy.umd.edu	Path:	uunet!mimsy!chris