netdev - Re: [PATCH v2] net: tls: fix possible race condition between do_tls_getsockopt_conf() and do_tls_setsockopt

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Date:   Sun, 26 Mar 2023 07:12:57 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     borisp@...dia.com, john.fastabend@...il.com, kuba@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        davejwatson@...com, aviadye@...lanox.com, ilyal@...lanox.com,
        fw@...len.de, sd@...asysnail.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: tls: fix possible race condition between
 do_tls_getsockopt_conf() and do_tls_setsockopt_conf()

Hi,

On Tue, Feb 28, 2023 at 10:33:44AM +0800, Hangyu Hua wrote:
> ctx->crypto_send.info is not protected by lock_sock in
> do_tls_getsockopt_conf(). A race condition between do_tls_getsockopt_conf()
> and do_tls_setsockopt_conf() can cause a NULL point dereference or
> use-after-free read when memcpy.
> 
> Please check the following link for pre-information:
>  https://lore.kernel.org/all/Y/ht6gQL+u6fj3dG@hog/
> 
> Fixes: 3c4d7559159b ("tls: kernel TLS support")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>

This patch has been applied to v6.1.y. Should it be applied to older kernel
branches as well ? I know it doesn't apply cleanly, but the conflicts
should be easy to resolve. I'll be happy to send backports to stable@ if
needed.

Thanks,
Guenter