Backup-L11-SystemProtection

Backup-L11-SystemProtection - System Protection CSIS0230A...

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System Protection CSIS0230A Lecture Eleven
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References Chapter 17 of Operating System Principles, 7th edition by Silberschatz et. al Section 17.1-17.7 Chapter 19 of Operating Systems, 3rd edition by Deitel et. al Section 19.4 Chapter 8 of Windows Internals, 4 th edition by Russinovich et. al 2 CSIS0230A Principles of Operating Systems
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System Protection Protection refers to a mechanism for controlling the access of programs, processes, or users to the resources in a computer system Reasons for protection Prevent harmful, intentional violation of access restriction by a user Ensure each program component uses system resources only in ways consistent with stated policies Improve reliability by detecting latent errors at the interfaces between component subsystems Role of system protection Specific the control policy as well as the means of enforcement 3 CSIS0230A Principles of Operating Systems
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Principles of Protection Guiding principle Principle of least privilege Programs, users and systems should be given just enough privileges to perform their tasks This minimizes the degree of damage even when failure or compromise of a component were happened To support “just enough” privileges, an access control mechanism should be provided to dynamically upgrade or revoke privileges when necessary One typical example user accounts 4 CSIS0230A Principles of Operating Systems
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Domain Protection A process should be allowed to access only those resources for which it has authorization. A process should be able to access, at any time, only those resources that it currently requires to complete its task Need-to-know principle Protection domain A collection of access rights to certain resources for
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This note was uploaded on 12/01/2010 for the course CS 2342 taught by Professor Dr during the Spring '10 term at HKU.

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Backup-L11-SystemProtection - System Protection CSIS0230A...

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