netdev - Re: net: use-after-free in neigh_timer_handler/sock

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Message-ID: <CANn89iKERkynDdVA1Wzn4MLfXY9E+c5QRU_qXJT_=Ya4_2og+A@mail.gmail.com>
Date:   Wed, 1 Mar 2017 15:15:54 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        James Morris <jmorris@...ei.org>
Subject: Re: net: use-after-free in neigh_timer_handler/sock_wfree

On Wed, Mar 1, 2017 at 3:09 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:

>
> But I doubt skb_orphan() is the solution here, shouldn't we just
> update sk->sk_wmem_alloc with skb->truesize changes?

Is it worth it ? Apart from syszkaller I mean...

We started with something that had a real impact on real workloads.

158f323b9868b59967ad96957c4ca388161be321 net: adjust skb->truesize in
pskb_expand_head()

Note that auditing the stack took me a while.