Daniel R Ehrlich <ehrlich_at_cse.psu.edu> writes:
| I am experiencing a weird problem with FvwmButtons/fvwm-2.0.42 and xlock under
| Solaris 2.5. If I have the following in my .fvwm2rc file:
|
| *FvwmButtons Lock xlock.xpm Exec /usr/openwin/bin/xlock -mode random
| xlock does not execute and emits the following error message:
| xlock: can't get the user password. Exiting ...
| You need to run xlock in setuid root mode on your local machine.
| Contact your system administrator.
|
| But, if I run the command
|
| /usr/openwin/bin/xlock -mode random
|
| from the shell prompt it works just fine. And xlock is already suid root:
|
| daneel:15> ls -gl /usr/openwin/bin/xlock
| -rwsrwxr-x 1 root bin 94484 Oct 2 1995 /usr/openwin/bin/xlock*
|
| and /usr/openwin/bin is on the local disk, so NFS is not stripping the suid
| bits for me:
I have a theory.
Suppose the author of xlock was an idiot and used getlogin() to find the
user's login name - fvwm will not have a controlling terminal or utmp entry
and getlogin() will fail.
Try this test:
rsh yourhost /usr/openwin/bin/xlock -mode random
If it fails the same way it's almost certainly a controlling tty problem.
Best solution (assuming I'm right - I may not be):
- Fix xlock to use getuid(), not getlogin().
Workaround:
- Get your shell startup (.env for ksh, cshrc for csh, etc)
or your first xterm to write the tty name (if any) to a well known
file.load the name when you invoke xlock and attach
#!/bin/sh
# attach to a useful tty
tty=`cat well-known-file`
if [ ! -c "$tty" ]
then echo "$0: $tty: not a tty" >&2; exit 1
fi
exec "$_at_" <"$tty" >"$tty" 2>&1
and say
Exec the-wrapper-above /usr/openwin/bin/xlock -mode rand
Let me know how you go,
- Cameron Simpson
cameron_at_research.canon.com.au, DoD#743
http://www.dap.csiro.au/~cameron/
--
The peever can look at the best day in his life and sneer at it.
- Jim Hill, JennyGfest '95
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Received on Thu Jun 20 1996 - 19:07:40 BST