32 bits is still too small. I wouldn't be comfortable relying on the size of the PID space to avoid collisions until we made it 128 bits or so. I think you're s

32 bits is still too small. I wouldn't be comfortable relying on the size of the PID space to avoid collisions until we made it 128 bits or so. I think you're still seriously overestimating the danger of a DoS here: whatever limits apply to forked processes can apply to process handles. Whatever mitigates fork bombs will also mitigate handle-based attacks. The advantages of process handles outweigh this small risk.