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

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Date:	Fri, 23 Jul 2010 00:29:13 -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: Fri, 23 Jul 2010 16:21:38 +0900

> Users calling recvmsg() after select() said "read operation will return with
> available data without blocking as long as you pass correct parameters" will
> get error code even if they passed correct parameters.

This is nonsense, because not all "parameters" are not visible to poll().

These "parameters" I speak of are virtual, they are my way of saying
that the errors returned by the existing LSM hooks are more like -EFAULT
or -EACCESS than -EINTR/-EAGAIN or blocking, the latter of which are
what are illegal for blocking socket invoking recvmsg() after poll
indicates there is data to read.
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