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Subject: Re: [PATCH 08/19] tcp: authopt: Disable via sysctl by default
To:     Leonard Crestez <cdleonard@gmail.com>,
        Dmitry Safonov <0x7f454c46@gmail.com>,
        David Ahern <dsahern@kernel.org>, Shuah Khan <shuah@kernel.org>
Cc:     Eric Dumazet <edumazet@google.com>,
        "David S. Miller" <davem@davemloft.net>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
        Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Yuchung Cheng <ycheng@google.com>,
        Francesco Ruggeri <fruggeri@arista.com>,
        Mat Martineau <mathew.j.martineau@linux.intel.com>,
        Christoph Paasch <cpaasch@apple.com>,
        Ivan Delalande <colona@arista.com>,
        Priyaranjan Jha <priyarjha@google.com>,
        Menglong Dong <dong.menglong@zte.com.cn>,
        netdev@vger.kernel.org, linux-crypto@vger.kernel.org,
        linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
References: <cover.1632240523.git.cdleonard@gmail.com>
 <b0abf2b789220708011a862a892c37b0fd76dc25.1632240523.git.cdleonard@gmail.com>
From:   David Ahern <dsahern@gmail.com>
Message-ID: <cafecbeb-7d4d-489c-177d-29fff78eb4d1@gmail.com>
Date:   Fri, 24 Sep 2021 19:57:19 -0600
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On 9/21/21 10:14 AM, Leonard Crestez wrote:
> This is mainly intended to protect against local privilege escalations
> through a rarely used feature so it is deliberately not namespaced.
> 
> Enforcement is only at the setsockopt level, this should be enough to
> ensure that the tcp_authopt_needed static key never turns on.
> 
> No effort is made to handle disabling when the feature is already in
> use.
> 

MD5 does not require a sysctl to use it, so why should this auth mechanism?