linux-kernel - Re: Linux 4.4.34

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Message-ID: <20161122173856.GC19939@tuebingen.mpg.de>
Date:   Tue, 22 Nov 2016 18:38:56 +0100
From:   Andre Noll <maan@...bingen.mpg.de>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>, Yibin Yang <yibyang@...co.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: Linux 4.4.34

On Tue, Nov 22, 09:14, Eric Dumazet wrote
> We definitely want to fix the real bug, not working around it.
> 
> Seems an aliasing problem, key_control and key_basic might point to
> adjacent memory
> and a barrier() would solve the issue as well.

This was also my first idea. I added some printk statements
which confirmed that key_basic->n_proto, key_basic->ip_proto and
key_control->thoff were indeed close to each other. They did not
overlap though.

Hope this helps
Andre
-- 
Max Planck Institute for Developmental Biology
Spemannstraße 35, 72076 Tübingen, Germany. Phone: (+49) 7071 601 829
http://people.tuebingen.mpg.de/maan/

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