netdev - Re: [PATCH net 4/4] tcp: enforce tcp_min_snd_mss in tcp_mtu

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Date:   Mon, 17 Jun 2019 10:16:12 -0700
From:   "Jonathan Lemon" <jonathan.lemon@...il.com>
To:     "Eric Dumazet" <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        "Eric Dumazet" <eric.dumazet@...il.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Jonathan Looney" <jtl@...flix.com>,
        "Neal Cardwell" <ncardwell@...gle.com>,
        "Tyler Hicks" <tyhicks@...onical.com>,
        "Yuchung Cheng" <ycheng@...gle.com>,
        "Bruce Curtis" <brucec@...flix.com>
Subject: Re: [PATCH net 4/4] tcp: enforce tcp_min_snd_mss in tcp_mtu_probing()



On 17 Jun 2019, at 10:03, Eric Dumazet wrote:

> If mtu probing is enabled tcp_mtu_probing() could very well end up
> with a too small MSS.
>
> Use the new sysctl tcp_min_snd_mss to make sure MSS search
> is performed in an acceptable range.
>
> CVE-2019-11479 -- tcp mss hardcoded to 48
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Jonathan Lemon <jonathan.lemon@...il.com>
> Cc: Jonathan Looney <jtl@...flix.com>
> Acked-by: Neal Cardwell <ncardwell@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
> Cc: Tyler Hicks <tyhicks@...onical.com>
> Cc: Bruce Curtis <brucec@...flix.com>
Acked-by: Jonathan Lemon <jonathan.lemon@...il.com>