Skip to main content

Protection [Operating System]

By
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” Mechanism: The stuff built into the OS to make Protection work. Policy: The data that says who can do what to whom.  
Labels:

Comments

Post a Comment

Popular posts from this blog

What is manipulator in C++?

By
Answer: Manipulators are special functions that can be included in the I/O statement to alter the format parameters of a stream. Table-2 shows some important manipulator functions that are frequently used. To access these manipulators, the file < iomanip.h > should be included in program.                               Table-2               Manipulators                                                    Equivalent ios function               set...
Post a Comment
Read more

Network Topology

By
A network topology is the arrangement of the computers cable and other components on a network. The major goal of network topology is to find out the most economical and efficient way to connect all the users to the network resources while providing adequate capacity to handle users demand, maintain system reliability and decrease the delay.    Topology is the map of physical network. The type of topology we use defect the type and capabilities network hardware’s its management and possibilities for future expansion. There are many types of network topology, some of these are:   Bus Topology Star Topology Mesh Topology   Ring Topology Tree Topology
Post a Comment
Read more

What is Servlet in Java?

By
A servlet is a small program that executes on a server. Just as applets dynamically extend the functionality of a web browser, servlets dynamically extend the functionality of a web server. It is helpful to understand that as useful as applets can be, they are just one half of the client/server equation. Not long after the initial release of Java, it became obvious that Java would also be useful on the server side. The result was the servlet. Thus, with the advent of the servlet, Java spanned both sides of the client/server connection.
Post a Comment
Read more