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From: campbell@sauron.UUCP (Mark Campbell)
Newsgroups: net.micro.68k,net.arch
Subject: Re: 68000 Memory Managment (Bechtolsheim patent) (SUID Patent)
Message-ID: <727@sauron.UUCP>
Date: Mon, 22-Sep-86 08:03:17 EDT
Article-I.D.: sauron.727
Posted: Mon Sep 22 08:03:17 1986
Date-Received: Tue, 23-Sep-86 23:06:23 EDT
References: <508@elmgate.UUCP> <64@mit-prep.ARPA>
Reply-To: campbell@sauron.UUCP (Mark Campbell)
Organization: NCR Corp., Advanced System Development, Columbia, SC
Lines: 17
Keywords: (SUID Patent)
Xref: mnetor net.micro.68k:1250 net.arch:3110

Ritchie's SUID parent is numbered 4,135,240 and was dated January 16, 1979.

Protection of data file contents.

Abstract:
An improved arrangment for controlling access to data files by computer users.
Access permission bits are used in the prior art to separately indicate
permissions for the file owner and nonowners to read, write and execute the file
contents.  An additional access control bit is added to each executable file.
When this bit is set to one, the identification of the current user is changed
to that of the owner of the executable file.  THe program in the executable file
then has access to all data files woned by the same owner.  This change is
temporary, the proper identification being restored when the program is
terminated.
-- 

Mark Campbell    Phone: (803)-791-6697     E-Mail: !ncsu!ncrcae!sauron!campbell