Source: Security Focus Linux Kernel Hardening by Anton Chuvakin,
Ph.D. last updated January 23, 2002 This article will cover the
issues of Linux hardening, with a specific focus on kernel
hardening and its use on production systems. Several kernel-
hardening approaches and their usability will be analyzed. Is
Linux secure? The question is much less useful, than 'Is Linux
"securable"?' The answer to the latter is a definite yes. Being
securable means that Linux can be made more secure (to whatever
degree necessary) by applying a clearly defined sequence of
steps that always produces the same result, and that can be
automated and applied to systems that have been in operation for
a long time. It would be ideal to be able to make securing
systems understandable by regular system administrators who
donít have formal security training. However, the last
requirement might be pushing it a bit, since security will
likely always require expertise. Linux can be made more secure
by hardening the system. It is beyond the