full-disclosure - New whitepaper: Writing IA32 Restricted Instruction Set Shellcode Decoder Loops

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From: skylined at edup.tudelft.nl (Berend-Jan Wever)
Subject: New whitepaper: Writing IA32 Restricted Instruction Set Shellcode Decoder Loops

Hi all,

This one got rejected by phrack and I couldn't be arsed to rewrite it so it would make the next edition:
"Writing IA32 Restricted Instruction Set Shellcode Decoder Loops" by SkyLined
( http://www.edup.tudelft.nl/~bjwever/whitepaper_shellcode.html )

The article addresses the requirements for writing a shellcode decoder loop using a limited number of characters that limits our instruction set. Most of it is based on my experience with alphanumeric decoders but the principles apply to any piece of code that is written to work with a limited instruction set. (It's a continuation on rix's and obscou's work for phrack).

Comments and questions welcome, but I can not guarantee an answer to n00b questions.

Cheers,
SkyLined

http://www.edup.tudelft.nl/~bjwever
<skylined@...p.tudelft.nl>