A setuid bash doesn't give up root.

[psu25682@odin.cc.pdx.edu (Karl M. Hegbloom)]

I've discovered something interesting.

# cp /bin/bash /tmp
# chmod u+s /tmp/bash

$ /tmp/bash
$ whoami
karlheg

# cp /usr/bin/zsh /tmp
# chmod u+s /tmp/zsh

$ /tmp/zsh
# whoami
root

 Perhaps we should have a policy that says all of our shells should
 follow the Bash behaviour?