The operating system needs to verify that the memory being written to / read from is a valid address, owned by the process making the request. It must prevent processes from corrupting other processes, or reading memory owned by other processes.
The operating system much take care with inputs from memory as:
a) The address given by the application as the address of the input or output could be
- an address of an illegal area of memory
- an address of a legal area that is paged to disk
b) or, could change if the application is multithreaded.
Basically, the operating system must ensure that it cannot be corrupted, crashed, or bypassed as a result of accessing memory as directed by the application.
- answered 2 years ago
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