linux-kernel - Re: [PATCH v2] net/unix: Add secdata to unix

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Date:	Tue, 22 Mar 2011 19:32:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	pekane52@...il.com
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	cxzhang@...son.ibm.com, sds@...ho.nsa.gov, jmorris@...ei.org,
	eparis@...isplace.org
Subject: Re: [PATCH v2] net/unix: Add secdata to unix_stream msgs

From: Pat Kane <pekane52@...il.com>
Date: Tue, 22 Mar 2011 19:38:37 -0500

> The unix_dgram routines add secdata to socket messages,
> but the unix_stream routines do not. I have added the
> two missing lines of code.
> 
> Signed-off-by: Pat Kane <pekane52@...il.com>

The security hooks appear to be only intended to operate on datagram
sockets, and as such I think the omission of UNIX stream sockets was
very much on purpose.

The SELINUX hook implementations even have "_dgram()" in their names.

Catherine Zhang added to CC: as she last made modifications to these
hooks.

> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index 1663e1a..8753cdd 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -1642,6 +1642,8 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
>  		max_level = err + 1;
>  		fds_sent = true;
>  
> +		unix_get_secdata(siocb->scm, skb);
> +
>  		err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
>  		if (err) {
>  			kfree_skb(skb);
> @@ -1930,6 +1932,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
>  		} else {
>  			/* Copy credentials */
>  			scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred);
> +			unix_set_secdata(siocb->scm, skb);
>  			check_creds = 1;
>  		}
>  
> -- 
> 1.7.1
> 
> --
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