Hierarchical security mechanism for dynamically assigning securi

Details Hierarchical security mechanism for dynamically assigning securi Hierarchical security mechanism for dynamically assigning securi

1976-12-30

1978-08-01

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 918

Patent

active

041047214

ABSTRACT:
A computer system organization which allows a program to specify a predetermined security level for other programs which it invokes, while at the same time being subject to security restraints placed on it either by a higher priority level invoking program or by the operating system. A plurality of security levels organized as a hierarchy which may be established by both problem programmers, and the operating system are then controlled by the operating system. A program cannot change its previously assigned level. Only a higher level invoking program can make such an alteration. A new program's security level indicator must be validated and then a protection code or `mask` of a predetermined size related to the security level must be validated. The system utilizes a plurality of special purpose bits in every data word which bits contain the protection field. Level indicators for the particular program determine the use of the protection field. A series of linking registers or a `Link Stack` having appropriate logic circuitry connected thereto is utilized for keeping track of the security level of all programs in a hierarchical sequence currently running on the system. The stack allows proper branching back to an originating program and prevents violation of security rules. The hardware additionally provides a mechanism for automatically checking each and every memory access, whether read or write, to assure that a correct protection field is present in each of the memory data words which is to be accessed or stored into.

REFERENCES:
patent: 3916385 (1975-10-01), Parmar et al.
patent: 4001783 (1977-01-01), Monahan et al.
patent: 4017839 (1977-04-01), Calle et al.
patent: 4020471 (1977-04-01), Woods et al.
patent: 4038645 (1977-07-01), Birney et al.

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