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

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Message-ID: <4D8A1BB4.4030709@schaufler-ca.com>
Date:	Wed, 23 Mar 2011 09:11:32 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Eric Paris <eparis@...hat.com>
CC:	David Miller <davem@...emloft.net>, pekane52@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	cxzhang@...son.ibm.com, sds@...ho.nsa.gov, jmorris@...ei.org,
	eparis@...isplace.org, paul.moore@...com,
	LSM <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v2] net/unix: Add secdata to unix_stream msgs

On 3/23/2011 8:57 AM, Eric Paris wrote:
> On Tue, 2011-03-22 at 19:32 -0700, David Miller wrote:
>> 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.
> And I'll add Paul Moore as I think he understands the intersection
> of /net and /security better than anyone.

Paul is definitely the man on this. I've also added the LSM list,
as while SELinux is the only current user of secdata that may not
always be the case.


>>> 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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