full-disclosure - On Polymorphic Evasion

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From: fdisclosure at alicampbell.org.uk (Ali Campbell)
Subject: On Polymorphic Evasion

Does the fixed-length nature of RISC instructions make detecting a 
shellcode on a platform such as PPC via IDS easier ? Or does the larger 
availability of pseudo-NOP instructions on these platforms (owing 
chiefly to more combinations of registers being available) in fact make 
it harder ?

I wrote some shellcode for OS X once, basically as an exercise, and I 
caught myself wondering about this.