June 2007
Intermediate to advanced
624 pages
16h 18m
English
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12. Privileged Programs
Nearly all men can stand adversity, but if you want to test a man’s character, give him power.
–ABRAHAM LINCOLN
Most programs execute with a set of privileges inherited from the user who runs them. For example, a text editor can display only files that its user has permission to read. Some programs carry additional privileges that enable them to perform operations that their users would otherwise be prevented from performing. These are privileged programs.
When written properly, a privileged program grants regular users a limited amount of access to some shared resource, such as physical memory, a hardware device, or special files such as the password file or the mail queue. When written improperly, a vulnerable privileged ...
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