su できない

Debian GNU/Linux 3.1 hackkit
hackkit login: guest
Password:
Last login: Tue Mar  6 06:47:10 2007 from muramasal.yamasita.jp on pts/0
Linux hackkit 2.6.12.6-arm1 #2 Thu Feb 8 15:00:20 JST 2007 armv5tejl GNU/Linux

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
No directory, logging in with HOME=/
guest@hackkit:/$ su - root
Password:
setgid: Operation not permitted
guest@hackkit:/$

hackkit:~# ls -l /bin/su
-rwxr-xr-x  1 root root 22840 Aug 14  2006 /bin/su
hackkit:~# chmod u+s /bin/su
hackkit:~# ls -l /bin/su
-rwsr-xr-x  1 root root 22840 Aug 14  2006 /bin/su
hackkit:~#

Debian GNU/Linux 3.1 hackkit
hackkit login: guest
Password:
Last login: Tue Mar  6 10:24:52 2007 on ttyS0
Linux hackkit 2.6.12.6-arm1 #2 Thu Feb 8 15:00:20 JST 2007 armv5tejl GNU/Linux

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
No directory, logging in with HOME=/
guest@hackkit:/$ su - root
Password:
hackkit:~# id
uid=0(root) gid=0(root) groups=0(root)
hackkit:~#

KURO-BOX/PRO

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