linux-kernel - Re: [PATCH] fix race in AF

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Message-Id: <20070607.184731.10907840.davem@davemloft.net>
Date:	Thu, 07 Jun 2007 18:47:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	miklos@...redi.hu
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix race in AF_UNIX

From: Miklos Szeredi <miklos@...redi.hu>
Date: Wed, 06 Jun 2007 10:08:29 +0200

> There are races involving the garbage collector, that can throw away
> perfectly good packets with AF_UNIX sockets in them.
> 
> The problems arise when a socket goes from installed to in-flight or
> vice versa during garbage collection.  Since gc is done with a
> spinlock held, this only shows up on SMP.
> 
> Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>

I'm going to hold off on this one for now.

Holding all of the read locks kind of defeats the purpose of using
the per-socket lock.

Can't you just lock purely around the receive queue operation?
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