Re: [iwar] News
From: Tony Bartoletti
From: azb@llnl.gov
To: iwar@egroups.com
Tue, 16 May 2000 10:51:09 -0700
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From: Tony Bartoletti
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Date: Tue, 16 May 2000 10:51:09 -0700
Reply-To: iwar@egroups.com
Subject: Re: [iwar] News
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At 08:53 PM 5/15/00 -0700, you wrote:
>Here's something I heard today - from a very reliable source:
>
>In order to allow application programs to access the display memory
>without operating system intervention, an undocumented hardware
>instruction on Pentium class Intel processors and possibly other
>'compatable' processor architectures has been included to grant
>user-level processes direct access to the real memory of the central
>processor. This means that a user process can read directly from or
>write directly to system memory. the net effect is that any user who
>can run a program of their devising on one of these computers is
>guaranteed to be able to take over the system and do whatever they wish
>- regardless of the operating system - and regardless of any add-on
>precautions at the software level.
So that's why my machine keeps crashing at home ... :)
Of course, there IS a software "solution". One must emulate the
processor in software, and only pass along those instructions
in the "documented" set. In essence, treat any executable as
data to be interpreted.
But few will want to "waste" their precious megahertz for this.
___tony___
Tony Bartoletti 925-422-3881
Information Operations, Warfare and Assurance Center
Lawrence Livermore National Laboratory
Livermore, CA 94551-9900
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