VMWare Detection?

["Polazzo Justin" <Justin.Polazzo () facilities gatech edu>]

 2004-11-14 Shortly after Dave posted his Trip Report from Poland, I
started getting emails from people wanted to know "how to detect VMWare
using one instruction"... So, although I'm not the first one who
discovered this trick, I decided to put a short paper about it
accompanied by a simple C code. This trick is able to detect not only
VMWare, but any VMM running on Pentium processor. 

from http://invisiblethings.org/papers/redpill.html:

int swallow_redpill () {
       unsigned char m[2+4], rpill[] =
"\x0f\x01\x0d\x00\x00\x00\x00\xc3";
       *((unsigned*)&rpill[3]) = (unsigned)m;
       ((void(*)())&rpill)();
       return (m[5]>0xd0) ? 1 : 0;


We already knew VMWare was detectable, just not sure if this code made
it to everyone.

-JP