All the sploit exercises are designed to be solvable with NX+ASLR without being dependent on which libc is used. The idea is you should only interact with stdin / stdout as if it was a remote service, argv & env is not needed for exploitation.
Of course you can still do whatever you like, have fun!
more here.......https://github.com/wapiflapi/exrs
Of course you can still do whatever you like, have fun!
more here.......https://github.com/wapiflapi/exrs