need help with chroot on RS/600 with AIX 3.1

[Robert E. Wargaski Jr.]

Folks,

A professor here asked me to write a login program which would give restricted
access to the filesystem.  I came up with the following:
/*
 *  This program sets up a restricted filesystem in a target subdirectory.
 *  REW, 14 Oct 90
 *
 *  Modified for use with the IBM RS/6000 on 16 Oct 90
 */

#define   targetdir   "/usr1/gail/tmp"
#define   uid          207
#define   gid          10
#define   shell        "bin/csh"

main ()
{
  chdir (targetdir);
  chroot (targetdir);
  setreuid (uid, uid);
  setregid (gid, gid)
  execl (shell,shell,(char *)0)
}

I got the binary to work, but when the user logs in, he can't do things like
ls (I have ls in the bin directory), cf.:

Script command is started on Tue Oct 16 17:42:12 1990
1 Ribm> telnet localhost
Trying...
Connected to loopback.
Escape character is '^T'.


AIX telnet (eccles.psych.nwu.edu)

login: expt
Password:
aix 3.1, one patch.
% ls -l
Killed
% Connection closed by foreign host.
2 Ribm> exit
Script command is complete on Tue Oct 16 17:42:35 1990

So, my question is:  what files and/or devices do I have to put in this mini-
filesystem to get this thing to work?  When I read the info page for chroot(1),
it gave me the mind-bogglingly useful line:

It is your responsibility to ensure that all vital data files are present in
the  new  root file system and that the path names accessing such
files are changed as necessary.

Help!

Regards,

Rob Wargaski
-- 

Robert E. Wargaski Jr.			 This is stupid. -- Vila
wargaski at nwu.edu			 When did that ever stop us. -- Avon
ACNS DSS, Northwestern University			Moooo!