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Re: Potentially dangerous Pentium bug disc
On Tue, 11 Nov 1997, Jay R. Ashworth wrote: > Date: 09 Nov 1997 09:26:39 +0100 > From: Torsten Hilbrich <Torsten.Hilbrich@bln.de> > Subject: New Pentium flaw > > Yesterday (Nov, 8) I found the following information on the news-ticker > page of the German Heise-Verlag (shortened to the essential information): > > > The Pentium in standard and MMX version halts on execution of the > > instruction: > > F0 0F C7 C8 > > This code sequence works independent of any memory protection of the > > operating system. > > I was able to reproduce this bug on a Pentium 133 system with the following > operating systems: DOS, Windows 95, Linux 2.0.31, and FreeBSD 2.2.x. > > I don't know about PentiumPro and Pentium II. > > The risk? Every pentium based server with user access for executing > programs can be crashed using this code sequence. Not to mention Trojan > Horses or Active-X controls. Does anybody know if this affects the Cyrix and AMD "Pentium Clone" chips?