execve-type memory-based function, possible?

["\"Jørgen P. Tjernø\"" <jorgen@devsoft.no>]

Hi!

I've recently been toying with methods for copy-protection and other 
esoteric subjects, for academic and hobby purposes, and I haven't found 
much info on this subject.

I want to see if it's possible (from userspace) to load and execute an 
ELF-binary based on a memory-buffer, i.e. load, relocate, etcetera (then 
execute) a program that's stored in memory.

I can't find any readily available options, I've toyed a bit with shmem 
(to get an fd) and fexecve, but haven't gotten far. I've briefly looked 
at the execve-code in the kernel.

So I'm curious; does anyone have any experience or suggestions on this 
subject? Is it at all possible to do the operations via usermode? I've 
toyed with creating copy-protection-schemes and binary packers and such 
under Win32, where it's possible, but I have no experience on the 
subject under Linux (or found any documentation on anyone else doing so).

Any papers, links, source-file-references etcetera would be appreciated. :-)

-- 
Kindest regards / Med vennlig hilsen,
  Jørgen P. Tjernø
  <jorgen@devsoft.no>
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