From owner-freebsd-hackers Sun Nov 9 04:31:53 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id EAA06242 for hackers-outgoing; Sun, 9 Nov 1997 04:31:53 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from klokan.sh.cvut.cz (root@klokan.sh.cvut.cz [193.84.105.141]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id EAA06237 for ; Sun, 9 Nov 1997 04:31:49 -0800 (PST) (envelope-from J.Klaus@sh.cvut.cz) Received: from skunk.sh.cvut.cz (skunk.sh.cvut.cz [194.108.141.34]) by klokan.sh.cvut.cz (8.6.12/8.6.9) with ESMTP id NAA23704; Sun, 9 Nov 1997 13:31:22 +0100 Received: from SKUNK/SpoolDir by skunk.sh.cvut.cz (Mercury 1.31); 9 Nov 97 13:31:22 +0200 Received: from SpoolDir by SKUNK (Mercury 1.31); 9 Nov 97 13:30:58 +0100 Received: from hell.sh.cvut.cz by skunk.sh.cvut.cz (Mercury 1.31); 9 Nov 97 13:30:50 +0200 Message-ID: X-Mailer: XFMail 1.1 [p0] on FreeBSD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit MIME-Version: 1.0 In-Reply-To: <3463605C.41C67EA6@whistle.com> Date: Sun, 09 Nov 1997 13:26:42 +0100 (CET) Organization: CTU Prague From: Jaroslav Klaus To: Julian Elischer Subject: RE: Newest Pentium bug (fatal) Cc: hackers@FreeBSD.ORG Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On 07-Nov-97 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. > > try the following c program. > > > > > unsigned char x[] = { 0xfo, 0x0f, 0xc7, 0xc8 }; > > > main () > { > void (*f)(void) = x; > f(); > } > > > > > We've checked: > K5... OK > P6... OK > P5... *SPLAT* > > no idea about the pentium II or other pentium copies. > K6? > > other pentium variants? > versions? > > this one DEFINITLY dies: > CPU: Pentium (99.38-MHz 586-class CPU) > Origin = "GenuineIntel" Id = 0x525 Stepping=5 > Features=0x1bf > > > share and enjoy.. > > julian ---------------------------------- E-Mail: Jaroslav Klaus Date: 09-Nov-97 Time: 13:26:43 This message was sent by XFMail ----------------------------------