netdev - Re: [PATCH] LSM: Add post recvmsg() hook.

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Date:	Wed, 21 Jul 2010 21:45:17 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	penguin-kernel@...ove.SAKURA.ne.jp
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, paul.moore@...com,
	netdev@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] LSM: Add post recvmsg() hook.

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Date: Thu, 22 Jul 2010 13:41:38 +0900

> Excuse me, below check is made inside recvmsg() and may return error if
> SELinux's policy has changed after the select() said "ready" and before
> security_socket_recvmsg() is called. No?

It does this before pulling the packet out of the receive queue of the
socket.  It's like signalling a parameter error to the process, no
socket state is changed.
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