Illegal and undocumented instructions

["Dave Farber" <farber () gmail com>]

Begin forwarded message:

> From: Lauren Weinstein <lauren () vortex com>
> Date: July 28, 2017 at 1:29:15 PM EDT
> To: nnsquad () nnsquad org
> Subject: [ NNSquad ] Illegal and undocumented instructions
>
>
> Illegal and undocumented instructions
>
> http://blog.koehntopp.info/index.php/2282-illegal-and-undocumented-instructions/
>
>      Sandsifter has uncovered secret processor instructions from
>    every major vendor; ubiquitous software bugs in disassemblers,
>    assemblers, and emulators; flaws in enterprise hypervisors;
>    and both benign and security-critical hardware bugs in x86
>    chips.  The findings have been summarized in a whitepaper
>    (PDF), which also describes how to effectively search the
>    instruction space of a CPU that has variable length
>    instructions from 1 to 15 bytes in length. A crafty way of
>    using page faults to determine the length of privileged
>    instructions while running unprivileges is shown.



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