Brain Teaser
Mike Moore
mike at x.co.uk
Fri Oct 5 01:05:51 AEST 1990
Here's one (do NOT actually do this, it appears to be lethal):
mv /bin/sh /bin/sh.bin
create a shell script called /bin/sh with the following
if [ $USER = "root" ]
then
/bin/sh.bin
else
/bin/rsh
fi
log out and log back in (assuming that your passwd file has you set to
use /bin/sh
you can't (can't exec a shell of course).
now assume that *everyone* is set to use /bin/sh (including root), how
do you get out of this without rebuilding the operating system? I don't
think there actually is one..... but....
--
---
Mike Moore
mike at x.co.uk or mike at ixi-limited.co.uk
Usual and obvious disclaimers... etc
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