Chapter 5. Access Control
Access control mechanisms that specify and enforce rules about who can access what form the basis for protecting and sharing resources among users of a multi-user system. To understand the basic idea behind access control, think of multi-user operating systems such as the different flavors of UNIX, Linux, and newer versions of MS Windows. These systems store user data in files. It is possible for a user to keep a particular file all for himself or herself or share it with others in read only or read-write mode. The operating system enforces the access control rules based on permissions associated with the files. Internally, these two operating systems take substantially different approaches to address the same problem. ...
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