linux-kernel - [PATCH v3 0/4] netlink: bridge: fix nf

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Date: Thu, 11 Jan 2024 23:06:36 +0800
From: Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Florian Westphal <fw@...len.de>,
	David Ahern <dsahern@...nel.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	Kees Cook <keescook@...omium.org>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Roopa Prabhu <roopa@...dia.com>
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	coreteam@...filter.org,
	bridge@...ts.linux.dev,
	kernel@...nvz.org,
	Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
Subject: [PATCH v3 0/4] netlink: bridge: fix nf_bridge->physindev use after free

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/

v3: resend it to proper lists and recipients

Pavel Tikhomirov (4):
  netfilter: nfnetlink_log: use proper helper for fetching physinif
  netfilter: nf_queue: remove excess nf_bridge variable
  netfilter: propagate net to nf_bridge_get_physindev
  netfilter: bridge: replace physindev with physinif in nf_bridge_info

 include/linux/netfilter_bridge.h           |  6 ++--
 include/linux/skbuff.h                     |  2 +-
 net/bridge/br_netfilter_hooks.c            | 42 +++++++++++++++++-----
 net/bridge/br_netfilter_ipv6.c             | 14 +++++---
 net/ipv4/netfilter/nf_reject_ipv4.c        |  9 +++--
 net/ipv6/netfilter/nf_reject_ipv6.c        | 11 ++++--
 net/netfilter/ipset/ip_set_hash_netiface.c |  8 ++---
 net/netfilter/nf_log_syslog.c              | 13 +++----
 net/netfilter/nf_queue.c                   |  6 ++--
 net/netfilter/nfnetlink_log.c              |  8 ++---
 net/netfilter/xt_physdev.c                 |  2 +-
 11 files changed, 80 insertions(+), 41 deletions(-)

-- 
2.43.0