Now, you may have guessed that how easily others can get root access to your system and can even restrict you by changing the root password. So you need to apply some additional security measures in order to prevent your system.

You can password protect LILO to add a little security (Read my article on password protecting LILO). You can also disable floppy boot in your BIOS settings so that someone is not able to use a boot disk. Also, remember to password protect your BIOS after you are finished.