Proof of concept for injecting simple shellcode via ptrace into a running process.
With ptrace() we can attach to any running process, allowing us to play with the current state. By looking at the /proc/PID/maps file we can find a memory region containing permission to execute, for example r-xp.
If we find such region, we can overwrite it's content using PTRACE_POKETEXT, with our shellcode. After that, we can modify the registers and set the value of rip register with the address of that memory region found in maps file.
In the end we have to continue execution with PTRACE_CONT.
