[iwar] News
From: Fred Cohen
From: fc@all.net
To: iwar@egroups.com
Mon, 15 May 2000 20:53:44 -0700 (PDT)
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Date: Mon, 15 May 2000 20:53:44 -0700 (PDT)
Reply-To: iwar@egroups.com
Subject: [iwar] News
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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.
FC
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