From: Tom Jennings <>
Date: Wed Jan 5 00:07:15 2005

On Mon, 3 Jan 2005, John Foust wrote:

> If the program binary sent over the serial line didn't include
> any characters that were eaten or rejected by COPY, and it
> ended with a CTRL/Z and COPY stopped there, it would work,
> wouldn't it?
> This reminds me of the constraints on today's exploits and code
> injection techniques: "write a series of three progressive
> exploits and loaders that fit in 64, 256 and 512 bytes,
> respectively, and do not contain any zeroes."

That sounds a bit much for the task at hand... !

> At 02:37 PM 1/3/2005, Tom Jennings wrote:
>> Hell, with debug you could WRITE the program to input the file
>> in binary! We're talking MSDOS, right? Not Windows?
>> You can type this crap directly into debug, "aXXXX".
> Go for it, Skippy! When it's debugged and tested, ship it! :-)
> As the hex to enter into DEBUG.

debug will assemble for you! It jsut won't do symbols.

I am surprised that no one pointed out that the input, store, incremnt
could more easily be done by:

         mov dx, DATAPORT

         djnz label

> You're right - the program for this would be small enough to
> fit in the margin of a FAQ. "Load and run from the serial port."
> - John
Received on Wed Jan 05 2005 - 00:07:15 GMT

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