netdev - Re: [Qestion] abort backport commit ("net/ulp: prevent ULP without clone op from entering the LISTEN status") in stable-4.19.x

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Date:   Fri, 3 Mar 2023 17:06:08 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     "liujian (CE)" <liujian56@...wei.com>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [Qestion] abort backport commit ("net/ulp: prevent ULP without
 clone op from entering the LISTEN status") in stable-4.19.x

On Fri, 3 Mar 2023 10:52:15 +0000 liujian (CE) wrote:
> When I was working on CVE-2023-0461, I found the below backport commit in stable-4.19.x maybe something wrong?
> 
> 755193f2523c ("net/ulp: prevent ULP without clone op from entering the LISTEN status") 
> 
> 1.  err = -EADDRINUSE in inet_csk_listen_start() was removed. But it
>     is the error code when get_port() fails. 

I think you're right, we should add setting the err back.

>  2. The change in __tcp_set_ulp() should not be discarded?

That part should be fine, all ULPs in 4.19 (i.e. TLS) should fail
the ->init() call if sk_state != ESTABLISHED.