Fuzzing session prevents application from exiting with `exit()` or `sys.exit()`

[678098]

Fuzzing main loop handles all exceptions, but for SystemExit exception (that is being generated when exit() or sys.exit() is called) it just doesn't stop. So it's impossible to exit fuzzing application from another thread with exit() or sys.exit().

Workaround: brutally exit with os._exit() (it just doesn't raise SystemExit exception).

[SR4ven]

Can you tell us where exactly the SystemExit exception is being caught? I tried a raise SystemExit in _main_fuzz_loop but that exited the program just fine. https://github.com/jtpereyda/boofuzz/blob/8384d46daef31622a4c51c96c970944fd3ce01c5/boofuzz/sessions.py#L1353

We catch Exception in some places, which I have to admit is not pretty, but doesn't catch BaseException which SystemExit or KeyboardInterrupt inherit from. I couldn't find any occurrences of base except: so SystemExit should work. https://docs.python.org/3/library/exceptions.html#Exception

[678098]

I will double check it soon