netdev - Re: [PATCH net 1/7] can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939

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Date: Fri, 6 Oct 2023 12:33:42 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>, netdev@...r.kernel.org,
	stable@...r.kernel.org, linux-can@...r.kernel.org,
	kernel@...gutronix.de, Sili Luo <rootlab@...wei.com>,
	davem@...emloft.net
Subject: Re: [PATCH net 1/7] can: j1939: Fix UAF in j1939_sk_match_filter
 during setsockopt(SO_J1939_FILTER)

Hi Jakub,

On Thu, Oct 05, 2023 at 09:44:21AM -0700, Jakub Kicinski wrote:
> On Thu,  5 Oct 2023 11:46:33 +0200 Marc Kleine-Budde wrote:
> > Lock jsk->sk to prevent UAF when setsockopt(..., SO_J1939_FILTER, ...)
> > modifies jsk->filters while receiving packets.
> 
> Doesn't it potentially introduce sleep in atomic?
> 
> j1939_sk_recv_match()
>   spin_lock_bh(&priv->j1939_socks_lock);
>   j1939_sk_recv_match_one()
>     j1939_sk_match_filter()
>       lock_sock()
>         sleep

Good point! Thank you for the review.

@Sili Luo, can you please take a look at this?

Regards,
Oleksij
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