Protection is the mechanisms & policies to keep programs & users from accessing or changing stuff they not do. It is internal to OS. Protection refers to a mechanism for controlling the access of programs, processes or users to the resources defined by a computer system. Protection ensures that only processes that have gained proper authorization from OS can operate on the files, memory segments, CPU & other resources of a system. Goals of Protection The OS consists of a collection of objects (hardware or software). Each object has a unique name & can be accessed through a well defined set of operations. The goal is to ensure that each object is accessed correctly & only by those processes that are allowed to do so. The guiding principles of Protection are as follow: 1. Principle of least privilege Programs, users & systems should be given just enough privileges to perform their task so that they can’t alter or harm. 2. Separate “Policy” from “Mechanism”...
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