netdev - Re: [PATCH 08/19] tcp: authopt: Disable via sysctl by default

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Message-ID: <cafecbeb-7d4d-489c-177d-29fff78eb4d1@gmail.com>
Date:   Fri, 24 Sep 2021 19:57:19 -0600
From:   David Ahern <dsahern@...il.com>
To:     Leonard Crestez <cdleonard@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        David Ahern <dsahern@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Yuchung Cheng <ycheng@...gle.com>,
        Francesco Ruggeri <fruggeri@...sta.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Christoph Paasch <cpaasch@...le.com>,
        Ivan Delalande <colona@...sta.com>,
        Priyaranjan Jha <priyarjha@...gle.com>,
        Menglong Dong <dong.menglong@....com.cn>,
        netdev@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/19] tcp: authopt: Disable via sysctl by default

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?