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Trust in Cyberspace (1999) / Chapter Skim
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Appendix G: Some Operating System Security Examples
Pages 291-292

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From page 291...
... Each program can have the "setuid" attribute set; if set, the program runs with the access rights of the owner of the program, rather than those of the program's invoker. Thus, for practical purposes, the program's invoker can establish an effective identity other than his or her own that is to be used when determining access permissions.
From page 292...
... and specific rights that have semantics only for a specific class of objects. Mediation decisions are made by the Security Reference Monitor based upon the token of the subject, the ACL of the object, and the requested access right.

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