Re: [PATCH 1/2] VMware detection support for x86 and x86-64

H. Peter Anvin
2008-09-25T04:39:20Z

Alok kataria wrote:
>
> Even if there is anything on that port on native hardware it would
> work perfectly well and is _safe_.
> First let me post the code to access this backdoor port (the way it
> should really be done )
>
> So whenever we query port 0x5658 , with the GETVERSION command (which
> is the first thing we do with this port), we expect that eax !=
> 0xFFFFFFFF and ebx has a VMWARE specific MAGIC value. Please note
> that ebx has been initialized to zero in the code above.
>

You have no idea what you just did to a real piece of hardware.

-hpa