Did you ever have "a lot" of space, like e.g. an entire 4k page, and you had to write some complex shellcode, but you couldn't be bothered to do it in assembly?
This project provides a minimal project template to develop shellcode in C, for
the AMD64 target. Edit the file src/main.c and add your custom logic. A
minimal libc is available with basic string and I/O functions.
- gcc
- make
Just run make. It's that simple.
You can test your shellcode by running build/shellcode.elf. You can also use
the minimal loader and run build/loader.elf build/shellcode.bin which will
run the shellcode just like how you will run it in the final target
application.
After compiling your shellcode with make, you can get the raw binary data
from build/shellcode.bin
If you need to perform some perparation before you can run C code, like when
rsp points to nowhere, you can edit src/_start.s to set up the environment
appropriately.