Access control system for use in a digital computer system with

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G06F 706

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active

045450129

ABSTRACT:
An access control system for use in a digital computer system wherein the memory system is organized into objects, a data item is locatable by specifying an object, instructions are contained in procedures, and the operations performed by the system include a call operation for suspending an execution of a procedure and commencing another execution and a return operation for terminating an execution and resuming a suspended execution. The access control system associates each procedure with a domain, i.e., a set of objects accessible to the procedure. The access control system further includes a secure stack object which is accessible only to the access control system. When a call operation commences execution of a procedure which has a different domain, the access control system responds to the call operation by storing information required to return to the current domain in the secure stack. When a return operation resumes execution of a procedure which has a different domain, the access control system responds to the call operation by using the information in the secure stack to return to the previous domain.

REFERENCES:
patent: 3891974 (1975-06-01), Coulter et al.
patent: 4025901 (1977-05-01), Bachman et al.
patent: 4084228 (1978-04-01), Dufond et al.
patent: 4325120 (1982-04-01), Colley et al.
patent: 4374409 (1983-02-01), Bienuenu et al.

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