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Re: WARNING: Serious Pentium Bug
- Subject: Re: WARNING: Serious Pentium Bug
- From: Tim Iverson <iverson at cisco dot com>
- Date: Fri, 7 Nov 1997 20:55:29 -0800 (PST)
- Cc: gnu-win32 at cygnus dot com
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@lionheart-com
+----------------
| Date: Fri, 7 Nov 1997 21:54:23 -0500
| From: Anonymous <anon@anon.efga.org>
| Subject: WARNING: Serious Pentium Bug
| To: gnu-win32@cygnus.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.
-
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