boot option

Hi list! Recently I saw if you boot a kernel with a boot option like 'init=/bin/bash' (to example: linux init=/bin/bash) you become root without athentification. Can anybody tell me why it works and how I protect? Thanx! Thomas -- Have A Nice Day -- ________________________________________________________________ Keine verlorenen Lotto-Quittungen, keine vergessenen Gewinne mehr! Beim WEB.DE Lottoservice: http://tippen2.web.de/?x=13