netdev - Re: [PATCH] LSM: Add security_socket_post_accept() andsecurity_socket_post_recv

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Message-Id: <20090421.060404.146628527.davem@davemloft.net>
Date:	Tue, 21 Apr 2009 06:04:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	penguin-kernel@...ove.SAKURA.ne.jp
Cc:	paul.moore@...com, linux-security-module@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] LSM: Add security_socket_post_accept()
 andsecurity_socket_post_recv_datagram().

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Date: Tue, 21 Apr 2009 21:52:57 +0900

> David Miller wrote:
>> Put this stuff in userspace, where you say it already is.  The kernel
>> isn't the place to dump every cool feature you want to bring in from
>> userspace.
> If I can do this stuff in userspace, I already put this stuff in userspace.
> Access control in userspace is easily bypassed, no good for policy based
> mandatory access control. The reason I propose these hooks in kernel is that
> nobody can bypass these hooks.

They you have to make your decisions when the packet arrives
in order to not break application expected semantics.

If poll() says to a listening socket that connections are
available, we MUST return a connection from accept() unless
there is a hard error.

The current proposal is not acceptable.
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