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 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII X-Google-Thread: 103376,bc1361a952ec75ca X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2001-08-02 14:56:27 PST Path: archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!cyclone.bc.net!newsfeed.direct.ca!look.ca!newshub2.rdc1.sfba.home.com!news.home.com!news1.rdc2.on.home.com.POSTED!not-for-mail Message-ID: <3B69CC8D.31323612@home.com> From: "Warren W. Gay VE3WWG" X-Mailer: Mozilla 4.75 [en] (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: How Ada could have prevented the Red Code distributed denial of service attack. References: <3B687EDF.9359F3FC@mediaone.net> <9kc355$ri0$1@nh.pace.co.uk> Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Date: Thu, 02 Aug 2001 21:56:26 GMT NNTP-Posting-Host: 24.141.193.224 X-Complaints-To: abuse@home.net X-Trace: news1.rdc2.on.home.com 996789386 24.141.193.224 (Thu, 02 Aug 2001 14:56:26 PDT) NNTP-Posting-Date: Thu, 02 Aug 2001 14:56:26 PDT Organization: Excite@Home - The Leader in Broadband http://home.com/faster Xref: archiver1.google.com comp.lang.ada:11146 Date: 2001-08-02T21:56:26+00:00 List-Id: Marin David Condic wrote: > > Can you point to a *single* post in this thread where *anyone* claimed that > writing programs in Ada guaranteed bug-free code? > > And you've got it bass-ackwards - they took the range checks *out* because > their analysis indicated the values could *never* exceed valid ranges - so > long as you were in an Arianne 4 flight envelope. Without the range checks, > the math triggered a hardware overflow that the FDA decisions indicated > *must* be a sensor failure because it *couldn't* happen in an Arianne 4 > flight envelope. Hence, shut down the channel and switch to the other side. > The software worked as it was designed to work - doing *exactly* what the > programmers wanted it to do - it just wasn't the right thing for Arianne 5. > > MDC > -- > Marin David Condic If this is not in an Ada FAQ, it should be. Warren. > Senior Software Engineer > Pace Micro Technology Americas www.pacemicro.com > Enabling the digital revolution > e-Mail: marin.condic@pacemicro.com > Web: http://www.mcondic.com/ > > "Goran Larsson" wrote in message > news:GHGA3t.Izq@approve.se... > > In article , > > Preben Randhol wrote: > > > > > Perhaps read it again. > > > > Why? > > > > The report clearly shows that you can have problematic software in > > any language. It was also ironic that it was a compiler generated > > range check on a value (that was not going to be used) that was the > > event that started the destructive chain of events. The management > > decision that any exception had to be due to hardware error (and > > warranted a shutdown) was _perhaps_ influenced by the belief that > > writing code in Ada resulted in bug free programs. :-) > > > > -- > > G�ran Larsson Senior Systems Analyst hoh AT approve DOT se -- Warren W. Gay VE3WWG http://members.home.net/ve3wwg