Boots – shoes – and leggings
Patent
1993-01-27
1995-09-19
Kriess, Kevin A.
Boots, shoes, and leggings
36424294, 364284, 364DIG11, G06F 1300, G06F 1314
Patent
active
054524601
ABSTRACT:
A method and apparatus, operating within a kernel of a UNIX-based host computer, that ensures that no unauthorized users or processes have accessed a pseudo-terminal (pty) slave file within a pty device driver prior to an authorized process accessing the pty slave file. Specifically, upon receiving, from an application program, a request to open a pty master file to form a pty device driver, the request is granted by the kernel only if the pty master file and pty slave file are presently closed. Similarly, a request to open a pty slave file to form a pty device driver is granted by the kernel only if the pty master file is open and a user identification of an application attempting to open the slave file is identical to a user identification of the application program which opened the master file. In this manner, a pseudo-terminal link between the pty master file and the pty slave file is secure from unauthorized processes being surreptitiously connected to the pty slave. Additionally, the owner and access permission codes of the open pty slave file are changed thereby further restricting access thereto.
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Case John H.
Distelberg Robert J.
Fabish Richard A.
Brosemer Jeffery J.
International Business Machines - Corporation
Kinnaman William A.
Kriess Kevin A.
Michaelson Peter L.
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