linux-kernel - Re: [PATCH net] ipv6: add complete rcu protection around np->opt

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Date:	Wed, 02 Dec 2015 23:38:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	dvyukov@...gle.com, vyasevich@...il.com, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	edumazet@...gle.com, wdauchy@...il.com,
	rweikusat@...ileactivedefense.com, syzkaller@...glegroups.com,
	kcc@...gle.com, glider@...gle.com, sasha.levin@...cle.com
Subject: Re: [PATCH net] ipv6: add complete rcu protection around np->opt

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 29 Nov 2015 19:37:57 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> This patch addresses multiple problems :
> 
> UDP/RAW sendmsg() need to get a stable struct ipv6_txoptions
> while socket is not locked : Other threads can change np->opt
> concurrently. Dmitry posted a syzkaller
> (http://github.com/google/syzkaller) program desmonstrating
> use-after-free.
> 
> Starting with TCP/DCCP lockless listeners, tcp_v6_syn_recv_sock()
> and dccp_v6_request_recv_sock() also need to use RCU protection
> to dereference np->opt once (before calling ipv6_dup_options())
> 
> This patch adds full RCU protection to np->opt
> 
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable.
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