Execute local system program using LD_PRELOAD injected from memfd

[HarryR]

Is it possible to send a shared object to netelf, then have it execute a local program with arguments and an LD_PRELOAD environment variable pointing to an fd created with memfd?

[0x27]

TL;DR: yes, it is. Got this working with a Python/ctypes implementation, just need to port it over at some point.
You do the following:

1. Create memfd, put hook.so data into it
2. Get current process ID and FD number of memfd
3. system("LD_PRELOAD=/proc/current_pid/fd/memfd_num some_program") (or similar)
4. Profit.