linux-kernel - Re: net/dccp: use-after-free in dccp_feat_activate

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Date:   Fri, 03 Mar 2017 07:13:04 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>,
        "David S. Miller" <davem@...emloft.net>, dccp@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: net/dccp: use-after-free in dccp_feat_activate_values

On Fri, 2017-03-03 at 16:06 +0100, Dmitry Vyukov wrote:

> Something that compiles is definitely better :)
> Reapplied.

Just to be clear : This is not the proper patch. This only reduces the
race.

bh_lock_sock() does not prevent a user process from owning the socket.

We need another protection, probably RCU based, or another spinlock
protecting the fields needed at SYNACK generation.