On Fri, Jul 30, 2010 at 02:56:33PM -0400, [email protected] wrote:
> On Fri, Jul 30, 2010 at 02:00:19PM -0400, Mark Wallace wrote:
> > Buying Microsoft won't get you fired until you get a virus into your
> > mainframe.  My nephew runs the computer systems for a university and
> > they had a lot of data wiped out and oh, brother!
> 
> Care to try again?
> 
> Mainframes don't run windows.
> 
> They also don't run intel processors.
> 
> There is no virus which windows could "get onto a mainframe".
> 
> -m

Long ago I read about a low-level virus (probably a boot-sector 
virus) that was designed to be "non damaging" on the intended 
microcomputer platform, but which had unintended damaging consequences 
when executed on a mainframe.  [There was no discussion about how the 
virus got onto the mainframe, though.]  The reason the same virus was 
damaging on the mainframe supposedly had to do with the difference in 
how the mainframe interpreted the assembly instructions.

The author was intending to indicate that writing even a seemingly 
undamaging virus could have unintended consequences because it is 
impossible to know every place that the code could execute.

I've never seen an actual instance of such a thing happening in 
practice, and I doubt I ever will, but it stuck in my mind as an 
interesting quirk to contemplate.

   -- Chris

Chris Knadle
[email protected]
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