Once LILO is not restricted it. You can:
Press the Alt, shift or Control key just before the system BIOS finishes, you should get the LILO prompt.
Type 'linux single', 'linux init=/bin/sh' or 'linux 1' in the prompt.
you should get to a shell prompt in singleuser mode (it will ask for password but you already know it)
remount read/write the / partition
mount -o remount,rw /
change the superuser password with passwd (since you are superuser it will not ask for the previous password).
我在進入後輸入"mount -o remount,rw /"
sh-2.05b# mount -o remount,re /
似乎可以執行root的命令也可改檔案內容,像是我改了passwd,請問這是怎麼回事丫.