netdev - Re: [PATCH net] net/tls: Fix kernel panic when socket is in TLS ULP

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Message-ID: <8c7a1bab-3c7b-e3bf-3572-afdf2abd2505@chelsio.com>
Date:   Tue, 10 Nov 2020 00:21:13 +0530
From:   Vinay Kumar Yadav <vinay.yadav@...lsio.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, borisp@...dia.com,
        secdev@...lsio.com
Subject: Re: [PATCH net] net/tls: Fix kernel panic when socket is in TLS ULP

Jakub,

On 11/7/2020 1:58 AM, Jakub Kicinski wrote:
> On Sat, 7 Nov 2020 02:02:42 +0530 Vinay Kumar Yadav wrote:
>> On 11/6/2020 12:16 AM, Jakub Kicinski wrote:
>>> On Thu, 5 Nov 2020 23:55:15 +0530 Vinay Kumar Yadav wrote:
>>>>>>> We should prevent from the socket getting into LISTEN state in the
>>>>>>> first place. Can we make a copy of proto_ops (like tls_sw_proto_ops)
>>>>>>> and set listen to sock_no_listen?
>>>>>>
>>>>>> Once tls-toe (TLS_HW_RECORD) is configured on a socket, listen() call
>>>>>> from user on same socket will create hash at two places.
>>>>>
>>>>> What I'm saying is - disallow listen calls on sockets with tls-toe
>>>>> installed on them. Is that not possible?
>>>>>      
>>>> You mean socket with tls-toe installed shouldn't be listening at other
>>>> than adapter? basically avoid ctx->sk_proto->hash(sk) call.
>>>
>>> No, replace the listen callback, like I said. Why are you talking about
>>> hash???
>>> As per my understanding we can't avoid socket listen.
>> Not sure how replacing listen callback solve the issue,
>> can you please elaborate ?
> 
> TLS sockets are not supposed to get into listen state. IIUC the problem
> is that the user is able to set TLS TOE on a socket which then starts
> to listen and the state gets cloned improperly.
> 
TLS-TOE can go to listen mode, removing listen is not an option and
TLS-TOE support only server mode so if we remove listen then we will not 
have TLS-TOE support which we don't want.