linux-kernel - Re: [TOMOYO 15/15] LSM expansion for TOMOYO Linux.

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Message-Id: <200708281939.JDH33719.MVSFOOQJHFFOtL@I-love.SAKURA.ne.jp>
Date:	Tue, 28 Aug 2007 19:39:13 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	paul.moore@...com
Cc:	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, chrisw@...s-sol.org
Subject: Re: [TOMOYO 15/15] LSM expansion for TOMOYO Linux.

Hello.

Paul Moore wrote:
> >    * post_recv_datagram is added in skb_recv_datagram.
>
> Can you explain to me why this is not possible using the existing 
> security_socket_sock_rcv_skb() LSM hook?

socket_sock_rcv_skb() is a hook for enqueue time.
I want a hook for dequeue time, because what TOMOYO Linux is doing is
not "whether a socket created by foo is permitted to pick up
an incoming packet from specific address/port"
but "whether bar is permitted to pick up
an incoming packet from specific address/port".
At the time of enqueue, I can't know who will pick up that packet.

Same reason for socket_post_accept(). What TOMOYO Linux is doing is
not "whether a socket created by foo is permitted to accept
a connection request from specific address/port"
but "whether bar is permitted to accept
a connection request from specific address/port".
At the time of enqueue, I can't know who will pick up that request.
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