Infects an elf64
This program will take a standard elf64 binary, and give it a new main. The new main will load a shared object of the users choice, and run an exported function before it returns to the original main.
Note, this is a proof of concept, and does not cover a lot of edge cases! If you want to actually be sneaky, don't use this as is! This does not handle PIE binaries right now.
possible later TODO: do our own dlopen/dlsym (fixes PIE as well)