netdev - Re: [PATCH net] net: clear sk->sk_ino in sk_set

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Message-ID: <CAEWA0a6b5P-9_ERvh9mCWOgbH6OYdTUXWVGgA20CQ5pfDC2sYA@mail.gmail.com>
Date: Wed, 17 Sep 2025 08:39:13 -0700
From: Andrei Vagin <avagin@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com
Subject: Re: [PATCH net] net: clear sk->sk_ino in sk_set_socket(sk, NULL)

On Wed, Sep 17, 2025 at 6:53 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> Andrei Vagin reported that blamed commit broke CRIU.
>
> Indeed, while we want to keep sk_uid unchanged when a socket
> is cloned, we want to clear sk->sk_ino.
>
> Otherwise, sock_diag might report multiple sockets sharing
> the same inode number.
>
> Move the clearing part from sock_orphan() to sk_set_socket(sk, NULL),
> called both from sock_orphan() and sk_clone_lock().
>
> Fixes: 5d6b58c932ec ("net: lockless sock_i_ino()")
> Closes: https://lore.kernel.org/netdev/aMhX-VnXkYDpKd9V@google.com/
> Closes: https://github.com/checkpoint-restore/criu/issues/2744
> Reported-by: Andrei Vagin <avagin@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Acked-by: Andrei Vagin <avagin@...gle.com>
I think we need to add `Cc: stable@...r.kernel.org`.

Thanks,
Andrei