Method and apparatus for providing token controlled access to pr

Details Method and apparatus for providing token controlled access to pr Method and apparatus for providing token controlled access to pr

1996-01-31

1997-04-08

Pan, Daniel H.

Boots, shoes, and leggings

395472, 395726, 364DIG1, 364DIG2, 371 401, G06F 1210, G06F 1214, G06F 1316

Patent

active

056196717

ABSTRACT:
A token controlled page protection technique for use in a virtual memory computer system (99). Generally, this technique assigns a unique token (440) to each program when that program requests a protected page of memory. The token is also assigned to the protected page. This protected page of memory cannot be altered by any process, even the operating system, without presenting the correct token. Subsequently, the program may use the assigned token to access and alter the information stored within a protected page. However, to alter a protected page of memory, a token supplied by the program and a token associated with the protected page must match. In this manner, the protected page cannot be altered by any other programs other than the program having the correct token. Additionally, the program uses a special instruction to alter the protected page of memory such that the program associated with a protected page does not have to remove the page protection to alter the information within the protected page. Consequently, the protected page is protected from inadvertent alteration by other programs even though the program using the special instruction and having the correct token can alter the contents of the page.

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