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The Design and Implementation of the FreeBSD® Operating System, Second Edition by George V. Neville-Neil, Robert N.M. Watson, Marshall Kirk McKusick

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Chapter 5. Security

Security is an integral part of contemporary operating-system design, from supporting multiple users and limiting their interactions via access-control, to mitigating software vulnerabilities via sandboxing, and implementing cryptographic protection of network and disk data. The FreeBSD security model addresses a broad range of use cases spanning classic UNIX servers and workstations, storage appliances, network routers and switches, Internet Service Provider hosting environments, and even hand-held devices. The security model has tracked these evolving needs through 30 years of contributions from active security research and development communities.

The kernel is the heart of FreeBSD’s Trusted Computing Base (TCB), the minimum ...

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