linux-kernel - Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

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Message-Id: <200912271020.III12990.JSHOOQOMtFLFFV@I-love.SAKURA.ne.jp>
Date:	Sun, 27 Dec 2009 10:20:10 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	michael@...top.org
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 2/3] Security: Implement disablenetwork semantics. (v4)

Michael Stone wrote:
> +int disablenetwork_security_socket_sendmsg(struct socket * sock,
> +					   struct msghdr * msg, int size)
> +{
> +	if (sock->sk->sk_family != PF_UNIX &&
> +		current->network &&
> +		(msg->msg_name != NULL || msg->msg_namelen != 0))
> +		return -EPERM;
> +	return 0;
> +}

I think we should accept msg->msg_name != NULL || msg->msg_namelen != 0
if the socket is connection oriented protocols (e.g. TCP).

struct sockaddr_in addr = { ... };
int fd = socket(PF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockadr *) &addr, sizeof(addr));
prctl( ... );
sendmsg(fd, (struct sockadr *) &addr, sizeof(addr));
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