netdev - Re: [PATCH net] af-unix: passcred support for sendpage

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Date:	Mon, 30 Nov 2015 15:17:57 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org, viro@...iv.linux.org.uk,
	edumazet@...gle.com
Subject: Re: [PATCH net] af-unix: passcred support for sendpage

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Thu, 26 Nov 2015 12:08:18 +0100

> sendpage did not care about credentials at all. This could lead to
> situations in which because of fd passing between processes we could
> append data to skbs with different scm data. It is illegal to splice those
> skbs together. Instead we have to allocate a new skb and if requested
> fill out the scm details.
> 
> Fixes: 869e7c62486ec ("net: af_unix: implement stream sendpage support")
> Reported-by: Al Viro <viro@...iv.linux.org.uk>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Applied and queued up for -stable... but here we go with even more
complexity in arguably one of the most complex and often buggiest
protocol family implementations :-/

We seem to enjoy self-torture but putting hack on top of hack...
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