From owner-freebsd-hackers Fri Nov 7 14:37:08 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id OAA28898 for hackers-outgoing; Fri, 7 Nov 1997 14:37:08 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from thought.calbbs.com (thought.calbbs.com [207.71.213.16]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id OAA28887 for ; Fri, 7 Nov 1997 14:37:01 -0800 (PST) (envelope-from brian@wasteland.calbbs.com) Received: from localhost (localhost [127.0.0.1]) by thought.calbbs.com (8.8.7/8.6.12) with SMTP id WAA27146 for ; Fri, 7 Nov 1997 22:37:07 GMT Date: Fri, 7 Nov 1997 14:37:06 -0800 (PST) From: "Brian W. Buchanan" X-Sender: brian@thought.calbbs.com To: hackers@FreeBSD.ORG Subject: Re: Newest Pentium bug (fatal) In-Reply-To: <3463605C.41C67EA6@whistle.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Fri, 7 Nov 1997, Julian Elischer wrote: > On a "genuine Intel" pentium (not pentium pro) > execution of the following sequence, 0xf0 0x0f 0xc7 0xc8 > > will stop the processor. This is doable from user mode and in > 16bitmode, or in fact any mode. > > We've checked: > K5... OK > P6... OK > P5... *SPLAT* > > no idea about the pentium II or other pentium copies. > K6? > > other pentium variants? > versions? > I just checked a Cyrix 6x86L 200+. The processor correctly signals an illegal instruction. -- Brian Buchanan brian@wasteland.calbbs.com "So now I'm an undemocratic, elitist `privacy extremist,' eh? Just like Thomas Jefferson? What's next? I'm presumed a terrorist until I turn over my encryption keys?" If privacy is outlawed, only outlaws will have privacy. Million Microbe March: Small is Beautiful.