[lug] socket programming/kernel question

[Bear Giles]

Zan Lynx wrote:
> I don't think you can with a datagram socket.  Try using a stream Unix
> socket and see what happens.

Stream sockets don't really match the problem.  I'm not saying I 
couldn't make a gatekeeper work, just that it would be very 
artificial.

> Also, I believe that Linux uses a positive increment on pids and wraps
> around when it runs out.  So there will be some time before pid reuse
> unless your machine is spawning furiously.

There are pid-based attacks.  Just stay in a tight loop spawning 
processes (and killing them) until you get the desired pid.  That 
requires local access, but not root access.

Bear