chmod 700 $SCRATCH_MNT/nosuid
chmod 4755 $SCRATCH_MNT/ls
-su - $qa_user -c "$SCRATCH_MNT/ls $SCRATCH_MNT/nosuid >/dev/null 2>&1"
+su -s/bin/sh - $qa_user -c "$SCRATCH_MNT/ls $SCRATCH_MNT/nosuid >/dev/null 2>&1"
if [ $? -eq 0 ] ; then
echo "Error: we shouldn't be able to ls the directory"
fi
umount $SCRATCH_DEV
status=0
-exit
+exit