From: Pablo Neira Ayuso <pablo@netfilter•org>
To: Pavel Tikhomirov <ptikhomirov@virtuozzo•com>
Cc: "David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Jakub Kicinski <kuba@kernel•org>, Paolo Abeni <pabeni@redhat•com>,
Florian Westphal <fw@strlen•de>, David Ahern <dsahern@kernel•org>,
Jozsef Kadlecsik <kadlec@netfilter•org>,
Kees Cook <keescook@chromium•org>,
Nikolay Aleksandrov <razor@blackwall•org>,
Roopa Prabhu <roopa@nvidia•com>,
netdev@vger•kernel.org, linux-kernel@vger•kernel.org,
netfilter-devel@vger•kernel.org, coreteam@netfilter•org,
bridge@lists•linux.dev, kernel@openvz•org
Subject: Re: [PATCH v3 0/4] netlink: bridge: fix nf_bridge->physindev use after free
Date: Wed, 17 Jan 2024 13:43:48 +0100 [thread overview]
Message-ID: <ZafLhL9U3f/i07BU@calendula> (raw)
In-Reply-To: <20240111150645.85637-1-ptikhomirov@virtuozzo.com>
On Thu, Jan 11, 2024 at 11:06:36PM +0800, Pavel Tikhomirov wrote:
> Code processing skb from neigh->arp_queue can access its
> nf_bridge->physindev, which can already be freed, leading to crash.
>
> So, as Florian suggests, we can put physinif on nf_bridge and peek into
> the original device with dev_get_by_index_rcu(), so that we can be sure
> that device is not freed under us.
>
> This is a second attempt to fix this issue, first attempt:
>
> "neighbour: purge nf_bridged skb from foreign device neigh"
> https://lore.kernel.org/netdev/20240108085232.95437-1-ptikhomirov@virtuozzo.com/
I have applied this series to nf.git
I have added a Fixed: tag sufficiently old to the patch fix so it can
reach -stable at some point.
My understanding is that this problem has been always there for
br_netfilter.
next prev parent reply other threads:[~2024-01-17 12:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-11 15:06 [PATCH v3 0/4] netlink: bridge: fix nf_bridge->physindev use after free Pavel Tikhomirov
2024-01-11 15:06 ` [PATCH v3 1/4] netfilter: nfnetlink_log: use proper helper for fetching physinif Pavel Tikhomirov
2024-01-15 10:51 ` Simon Horman
2024-01-11 15:06 ` [PATCH v3 2/4] netfilter: nf_queue: remove excess nf_bridge variable Pavel Tikhomirov
2024-01-15 10:52 ` Simon Horman
2024-01-11 15:06 ` [PATCH v3 3/4] netfilter: propagate net to nf_bridge_get_physindev Pavel Tikhomirov
2024-01-15 10:52 ` Simon Horman
2024-01-11 15:06 ` [PATCH v3 4/4] netfilter: bridge: replace physindev with physinif in nf_bridge_info Pavel Tikhomirov
2024-01-17 12:43 ` Pablo Neira Ayuso [this message]
2024-01-17 14:15 ` [PATCH v3 0/4] netlink: bridge: fix nf_bridge->physindev use after free Florian Westphal
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