Apparatus and method for controlling access to data using domain

Details Apparatus and method for controlling access to data using domain Apparatus and method for controlling access to data using domain

1990-08-21

1994-01-18

Shaw, Gareth D.

Boots, shoes, and leggings

364DIG1, 3642542, 3642543, 3642817, 3642467, 3642468, 3642466, G06F 946, G06F 1300

Patent

active

052806146

ABSTRACT:
In an object-based computer system, each object is contained in, and each task executes in, a protection domain. Domains exist at several hierarchical domain levels, some levels having multiple discrete domains, while others have one common domain. A task may access an object if the domain in which the task is executing is the same as the domain containing the object, or if the domain in which it is executing occupies a higher hierarchical domain level than the domain containing the object. Each object includes a domain attribute, which is a numerical value defining the domain in which it is contained. The domain attribute of the currently executing task is stored in a domain register. When an attempt is made to access data within an object, the domain attribute of the object is compared with the domain attribute stored in the domain register. If the access conditions are met, access is permitted.

REFERENCES:
patent: 4525780 (1985-06-01), Bratt et al.
patent: 4545012 (1985-10-01), Clancy et al.

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