Ask Kevin M. about this. He is now working in systems security. You could build in the best security system in the world, no matter what OS and releasing the administrator login and password, and with Linux this only takes compromising the password, and you are shot. The same applies if you supply insufficient physical security. If I can steal your system (not that I would want to) and gain console access, and you have not disabled it, I can, given sufficient time, crack into it and away I go. This is why some systems only exist behind several feet of reinforced concrete and have almost impossible to guess passwords. All of this applies to Linux and the application of SELinux under FC3 just gives some system security as recommended by the United States National Security Agency.
social engineering can defeat the best security system.
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James McKenzie
With assistance, Now running 2.6.11rc3, Software Suspend 2
and ibm-acpi .1
Need a home for my .rpm