linux-kernel - Re: [PATCH 2.6.32 15/62] udp: fix behavior of wrong checksums

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Message-ID: <1442281471.2298.76.camel@decadent.org.uk>
Date:	Tue, 15 Sep 2015 02:44:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Willy Tarreau <w@....eu>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2.6.32 15/62] udp: fix behavior of wrong checksums

On Sun, 2015-09-13 at 00:56 +0200, Willy Tarreau wrote:
> 2.6.32-longterm review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Eric Dumazet <edumazet@...gle.com>
> 
> commit beb39db59d14990e401e235faf66a6b9b31240b0 upstream.
> 
> We have two problems in UDP stack related to bogus checksums :
> 
> 1) We return -EAGAIN to application even if receive queue is not empty.
>    This breaks applications using edge trigger epoll()
> 
> 2) Under UDP flood, we can loop forever without yielding to other
>    processes, potentially hanging the host, especially on non SMP.
> 
> This patch is an attempt to make things better.
> 
> We might in the future add extra support for rt applications
> wanting to better control time spent doing a recv() in a hostile
> environment. For example we could validate checksums before queuing
> packets in socket receive queue.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> 
> CVE-2015-5364
[...]

As there were two different problems, each deserving its own CVE ID,
this also fixes CVE-2015-5366.

Ben.

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