From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,LOTS_OF_MONEY autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,bc1361a952ec75ca X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-08-03 10:54:09 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news-was.dfn.de!znr.news.ans.net!abq.news.ans.net!news.chips.ibm.com!newsfeed.btv.ibm.com!news.btv.ibm.com!not-for-mail From: pontius@btv.ibm.com (Dale Pontius) Newsgroups: comp.lang.ada Subject: Re: How Ada could have prevented the Red Code distributed denial of service attack. Date: 3 Aug 2001 17:54:06 GMT Organization: IBM Global Services North -- Burlington, Vermont, USA Message-ID: <9keofu$ivo$3@news.btv.ibm.com> References: <87r8uvuu48.fsf@deneb.enyo.de> NNTP-Posting-Host: kimon.btv.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: news.btv.ibm.com 996861246 19448 9.61.131.227 (3 Aug 2001 17:54:06 GMT) X-Complaints-To: news@btv.ibm.com NNTP-Posting-Date: 3 Aug 2001 17:54:06 GMT X-Newsreader: knews 1.0b.0 Xref: archiver1.google.com comp.lang.ada:11240 Date: 2001-08-03T17:54:06+00:00 List-Id: In article , tmoran@acm.org writes: >> Ah, I see. Here's an interesting resource: >> >> http://www.ajwm.net/amayer/papers/B5000.html > Ah, nostalgia. As a student assistant I worked on a B5500 MCP. > I hope many of the good ideas of the last 40 years will be rediscovered > by the end of the next 40. > >> > The 386 was designed with a lot of support for OS security(1), >> >> Actually, it was the 286. The 386 introduced another VM layer which >> supports paging, IIRC. > Wasn't the 286 selector stuff a whole lot simpler than the 386? > Is it the case that it was impossible, or at least nobody ever > managed, to make an OS that actually used the 386 stuff? I think you have it partly backwards. The 286 had all the selector stuff, and OS/2 1.x used it, as well as the DPMS specs, which Windows sort of used through Win3.1. (Maybe afterward too, but I'm not sure.) Then the 386 came out with true paging and the like, and selectors were pretty much dropped. I'm not sure if there's any involvement with selectors in Xeon 36-bit addressing, or not. Dale Pontius NOT speaking for IBM