netdev - Re: [PATCH net] udp: prevent bugcheck if filter truncates packet too much

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Message-Id: <20160711.124348.2217222752892197777.davem@davemloft.net>
Date:	Mon, 11 Jul 2016 12:43:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mkubecek@...e.cz
Cc:	samanthakumar@...gle.com, marco.gra@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net
Subject: Re: [PATCH net] udp: prevent bugcheck if filter truncates packet
 too much

From: Michal Kubecek <mkubecek@...e.cz>
Date: Fri,  8 Jul 2016 17:52:33 +0200 (CEST)

> If socket filter truncates an udp packet below the length of UDP header
> in udpv6_queue_rcv_skb() or udp_queue_rcv_skb(), it will trigger a
> BUG_ON in skb_pull_rcsum(). This BUG_ON (and therefore a system crash if
> kernel is configured that way) can be easily enforced by an unprivileged
> user which was reported as CVE-2016-6162. For a reproducer, see
> http://seclists.org/oss-sec/2016/q3/8
> 
> Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> Reported-by: Marco Grassi <marco.gra@...il.com>
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

Applied and queued up for -stable, thanks.