Sockets permanently in CLOSE_WAIT state.
Andy Sloane (andude@guildsoftware.com)
Tue, 18 Aug 1998 01:24:46 -0500
While hacking away at a project today I discovered a rather strange
occurrence in a multithreaded environment using sockets. The jist of the
problem is I was select()ing on a socket in one thread and at the same time
closing it in another (yes, this is a design oversight on my part). To my
surprise, after killing the server and all clients, the sockets remained in
the CLOSE_WAIT state, yet no client processes were still running; I
expected to at least see a thread stuck in a D state or something. It's
not a 'normal' thing to do, but it's also something that an attacker could
potentially use to run the system out of non-root sockets. Is this a known
issue? (for the record I'm using linuxthreads.)
-Andy.
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