netdev - Re: [PATCH v2 net] sock: ignore SCM_RIGHTS and SCM_CREDENTIALS in __sock_cmsg

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Date:	Mon, 11 Jul 2016 14:37:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	soheil.kdev@...il.com
Cc:	netdev@...r.kernel.org, willemb@...gle.com, edumazet@...gle.com,
	soheil@...gle.com
Subject: Re: [PATCH v2 net] sock: ignore SCM_RIGHTS and SCM_CREDENTIALS in
 __sock_cmsg_send

From: Soheil Hassas Yeganeh <soheil.kdev@...il.com>
Date: Mon, 11 Jul 2016 16:51:26 -0400

> From: Soheil Hassas Yeganeh <soheil@...gle.com>
> 
> Sergei Trofimovich reported that pulse audio sends SCM_CREDENTIALS
> as a control message to TCP. Since __sock_cmsg_send does not
> support SCM_RIGHTS and SCM_CREDENTIALS, it returns an error and
> hence breaks pulse audio over TCP.
> 
> SCM_RIGHTS and SCM_CREDENTIALS are sent on the SOL_SOCKET layer
> but they semantically belong to SOL_UNIX. Since all
> cmsg-processing functions including sock_cmsg_send ignore control
> messages of other layers, it is best to ignore SCM_RIGHTS
> and SCM_CREDENTIALS for consistency (and also for fixing pulse
> audio over TCP).
> 
> Fixes: c14ac9451c34 ("sock: enable timestamping using control messages")
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> Reported-by: Sergei Trofimovich <slyfox@...too.org>
> Tested-by: Sergei Trofimovich <slyfox@...too.org>

Applied and queued up for -stable, thanks.