netdev - [Consult]kernel tcp socket lack of refcnt for net may cause uaf problem?

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Date: Tue, 19 Dec 2023 13:44:36 +0000
From: mengkanglai <mengkanglai2@...wei.com>
To: "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "Fengtao (fengtao, Euler)" <fengtao40@...wei.com>, "Yanan (Euler)"
	<yanan@...wei.com>
Subject: [Consult]kernel tcp socket lack of refcnt for net may cause uaf
 problem?

Hello, Eric:

I found upstream have fixed a UAF issue (smc: Fix use-after-free in tcp_write_timer_handler()): 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9744d2bf19762703704ecba885b7ac282c02eacf

When create a kernel socket use sock_create_kern , it won't call get_net() to increase refcnt for net where the socket is located.
I found some other subsystem(like rds and sunrpc) also use sock_create_kern to create kernel tcp socket, I want to know if they have same UAF problem?

Best wishes!