Re: [patch] af_unix fix for a panic a DoS and a memory leak [Re:
Alexander Viro (viro@math.psu.edu)
Tue, 2 Mar 1999 19:50:08 -0500 (EST)
D'oh. I've looked into FreeBSD implementation of AF_UNIX and it's, erm,
funny.
* accept() doesn't return closed connections.
* unp_gc() (their equivalent of unix_gc()) ignores listen queues
* ... and is horribly bad in performance
* connect() behaves as our one does.
* unless they have a limit on amount of unp (== unix_socket)
somewhere else they are vulnerable to Andrea's DoS.
OpenBSD security logs:
They've recently found a select()/accept() race (Feb 17). And
fixed it. We were lucky here. Their fix seems to be still vulnerable to
Andrea's DoS (modulo independent enforcement of unp limit). unp_gc()
ignores listen queues (inherited from 4.4BSD).
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