From: rminnich AT sarnoff DOT com (Ron G. Minnich) Subject: Re: WARNING: Serious Pentium Bug 10 Nov 1997 08:20:50 -0800 Message-ID: References: <199711080455 DOT UAA21222 AT stars DOT cisco DOT com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII To: gnu-win32 AT cygnus DOT com Oh, it crashes machines all right. Machines running NT, 95, linux, freebsd, you name it. We've tested lots of pentiums here and it locks them all up. It's good fun. Multiple users, well, I thought that was the point of nt. Note you don't have to be logged in to make it run this -- if you're a bad guy you'll get the daemons to run it for you via the tried and true paths. ron Ron Minnich |Java: an operating-system-independent, rminnich AT sarnoff DOT com |architecture-independent programming language (609)-734-3120 |for Windows/95 and Windows/NT on the Pentium ftp://ftp.sarnoff.com/pub/mnfs/www/docs/cluster.html On Fri, 7 Nov 1997, Tim Iverson wrote: > Just to keep everyone from getting too scared, this really would only matter > for secure sites with multiple users -- that particular sequence is a > nonsense instruction. The only folks using it would be those deliberately > wanting to bring the system down. > > Here it is decoded: lock cmpxchg8b eax > > BTW, I haven't tested it, so I don't know if this is even true. It should > generate an illegal instruction exception, since the operand needs to be a > memory reference. > > > - Tim Iverson > iverson AT lionheart-com > > > +---------------- > | Date: Fri, 7 Nov 1997 21:54:23 -0500 > | From: Anonymous > | Subject: WARNING: Serious Pentium Bug > | To: gnu-win32 AT cygnus DOT com > | > | code will crash any machine running on a pentium CPU, MMX or no > | char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 }; > ... > | This require no special permissions to run, it works fine with > | average-joe-userspace permissions. I have verified this, it works. > - > For help on using this list (especially unsubscribing), send a message to > "gnu-win32-request AT cygnus DOT com" with one line of text: "help". > - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request AT cygnus DOT com" with one line of text: "help".