Unix and Linux Security
Gerald Beuchelt, The MITRE Corporation1, Bedford, MA, U.S.A.
When Unix was first booted on a PDP-8 computer at Bell Labs, it already had a basic notion of user isolation, separation of kernel and user memory space, and process security. It was originally conceived as a multiuser system, and as such, security could not be added on as an afterthought. In this respect, Unix was different from a whole class of computing machinery that had been targeted at single-user environments.
Linux is mostly a GNU software-based operating system with a kernel originally written by Linus Torvalds and many of the popular utilities from the GNU Software Foundation and other open source organizations added. GNU/Linux implements ...
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