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During shellcode development, it makes sense to have a program that can easily load your shellcode at a controlable location, allows you to set registers and memory to certain values and execute the shellcode by setting EIP through a RET or CALL instruction.
The Testival <http://code.google.com/p/testival/> project aims to do all those things and more: it also allows you to test ret-into-libc attacks, set the type of memory allocation you want (RWEflags, etc…), report exceptions in your code to stdout as well as load DLLs to test shellcode in DllMain.
Testival is used by ALPHA3 <http://code.google.com/p/alpha3/> for automatically testing if all the en-/decoders work.
Testival requires SkyBuild <http://code.google.com/p/skybuild/> to automatically build all files.
Berend-Jan Wever <firstname.lastname@example.org> http://skypher.com/SkyLined