Re: WARNING: Linux Intel Pentium Bug
Kurt Seifried (seifried@LEXIE.V-WAVE.COM)
Fri, 07 Nov 1997 11:55:07 -0700
> This Program was distributed in the newsgroups and on irc so i thought i
> would post it here....
> (prog attached)
>
> In article <3462ADCD.135B@noname.com>, <noname@noname.com> wrote:
> > Check this out. If you execute F0 0F C7 C8 on a P5 it will lock the
> >machine up. This is true for any operating system including usermode
> >Linux. It's pretty cool. Basically, the opcodes are an invalid form of
> >cmpxchg8b eax with a lock prefix. Has anyone seen this before? The
> >problem doesn't show itself for the Pentium Pro or Pentium 2.
>
> Cool. It also works (sic) from V86 mode, so if you want to play around, just
> use DOS debug under whatever DOS emulator the OS you are using provides.
> Anyone try it on a Pentium MMX?
>
> --Tim Smith
Ran it on my P166, kaboom, ran it on my new P166MMX, kaboom. I guess that
would be a yes. This is kind of scary, is there any possibility of a
kernel patch that can take care of this?
-seifried