netdev - Re: What is lock_sock() before skb_free

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Date:	Fri, 24 Apr 2009 06:56:52 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	sam@...ack.fr
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: What is lock_sock() before skb_free_datagram() for?

Samir Bellabes wrote:
> what is the purpose of having such hooks ?
Same as security_socket_post_accept() (i.e. to drop datagrams from unwanted
peers).

I need to understand the meaning of "poll()" returning "ready" to understand
why security_socket_accept() and security_socket_recvmsg() are permitted to
return an error (though these hooks don't remove from the queue).

My understanding is that "poll()" returning "ready" does not guarantee that
accept()/recvmsg() shall return a valid file descriptor/datagram;
"poll()" returning "ready" guarantees merely accept()/recvmsg() does not
need to wait for connection/datagram. (Otherwise, security_socket_accept()
and security_socket_recvmsg() have to be gone.)
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