From: Florian Westphal <fw@strlen.de>
To: Andrew Vagin <avagin@parallels.com>
Cc: Florian Westphal <fw@strlen.de>,
Eric Dumazet <eric.dumazet@gmail.com>,
Andrey Vagin <avagin@openvz.org>,
netfilter-devel@vger.kernel.org, netfilter@vger.kernel.org,
coreteam@netfilter.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, vvs@openvz.org,
Pablo Neira Ayuso <pablo@netfilter.org>,
Patrick McHardy <kaber@trash.net>,
Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
"David S. Miller" <davem@davemloft.net>,
Cyrill Gorcunov <gorcunov@openvz.org>
Subject: Re: [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find_get
Date: Thu, 9 Jan 2014 21:56:22 +0100 [thread overview]
Message-ID: <20140109205622.GA29458@breakpoint.cc> (raw)
In-Reply-To: <20140109203206.GA26348@paralelels.com>
Andrew Vagin <avagin@parallels.com> wrote:
> Can we allocate conntrack with zero ct_general.use and increment it at
> the first time before inserting the conntrack into the hash table?
> When conntrack is allocated it is attached exclusively to one skb.
> It must be destroyed with skb, if it has not been confirmed, so we
> don't need refcnt on this stage.
>
> I found only one place, where a reference counter of unconfirmed
> conntract can incremented. It's ctnetlink_dump_table().
What about skb_clone, etc? They will also increment the refcnt
if a conntrack entry is attached to the skb.
next prev parent reply other threads:[~2014-01-09 20:56 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-07 10:31 [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find_get Andrey Vagin
2014-01-07 11:42 ` Vasily Averin
2014-01-07 15:08 ` Eric Dumazet
2014-01-07 15:25 ` Florian Westphal
2014-01-08 13:42 ` Eric Dumazet
2014-01-08 14:04 ` Florian Westphal
2014-01-08 17:31 ` Eric Dumazet
2014-01-08 20:18 ` Florian Westphal
2014-01-08 20:23 ` Florian Westphal
2014-01-09 20:32 ` Andrew Vagin
2014-01-09 20:32 ` Andrew Vagin
2014-01-09 20:56 ` Florian Westphal [this message]
2014-01-09 21:07 ` Andrew Vagin
2014-01-09 21:07 ` Andrew Vagin
2014-01-09 21:26 ` Florian Westphal
2014-01-09 5:24 ` Andrew Vagin
2014-01-09 15:23 ` Eric Dumazet
2014-01-09 21:46 ` Andrey Wagin
2014-01-08 13:17 ` [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find_get (v2) Andrey Vagin
2014-01-08 13:47 ` Eric Dumazet
2014-01-12 17:50 ` [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find_get (v3) Andrey Vagin
2014-01-12 20:21 ` Eric Dumazet
2014-01-14 10:51 ` Andrew Vagin
2014-01-14 10:51 ` Andrew Vagin
2014-01-14 10:51 ` Andrew Vagin
2014-01-14 11:10 ` Andrey Wagin
2014-01-14 14:36 ` Eric Dumazet
2014-01-14 17:35 ` [PATCH] [RFC] netfilter: nf_conntrack: don't relase a conntrack with non-zero refcnt Andrey Vagin
2014-01-14 17:44 ` Cyrill Gorcunov
2014-01-14 18:53 ` Florian Westphal
2014-01-15 18:08 ` Andrew Vagin
2014-01-15 18:08 ` Andrew Vagin
2014-01-16 9:23 ` Florian Westphal
2014-02-02 23:30 ` Pablo Neira Ayuso
2014-02-03 13:59 ` Andrew Vagin
2014-02-03 13:59 ` Andrew Vagin
2014-02-03 16:22 ` Eric Dumazet
2014-01-27 13:44 ` Andrew Vagin
2014-01-27 13:44 ` Andrew Vagin
2014-01-29 19:21 ` [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find_get (v3) Pablo Neira Ayuso
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