From: Florian Westphal <fw@strlen•de>
To: Eric Dumazet <eric.dumazet@gmail•com>
Cc: Pablo Neira Ayuso <pablo@netfilter•org>,
netfilter-devel@vger•kernel.org, davem@davemloft•net,
netdev@vger•kernel.org, kuba@kernel•org
Subject: Re: [PATCH net-next 18/32] netfilter: egress: avoid a lockdep splat
Date: Mon, 28 Feb 2022 03:32:46 +0100 [thread overview]
Message-ID: <20220228023246.GA26547@breakpoint.cc> (raw)
In-Reply-To: <872e2596-4d7c-3b91-341c-0db3a3d7fd57@gmail.com>
Eric Dumazet <eric.dumazet@gmail•com> wrote:
> > index b71b57a83bb4..b4dd96e4dc8d 100644
> > --- a/include/linux/netfilter_netdev.h
> > +++ b/include/linux/netfilter_netdev.h
> > @@ -94,7 +94,7 @@ static inline struct sk_buff *nf_hook_egress(struct sk_buff *skb, int *rc,
> > return skb;
> > #endif
> > - e = rcu_dereference(dev->nf_hooks_egress);
> > + e = rcu_dereference_check(dev->nf_hooks_egress, rcu_read_lock_bh_held());
> > if (!e)
> > return skb;
>
>
> It seems other rcu_dereference() uses will also trigger lockdep splat.
> if (genbit)
> blob = rcu_dereference(chain->blob_gen_1);
> else
> blob = rcu_dereference(chain->blob_gen_0);
>
> I wonder how many other places will need a fix ?
I don't like that, all nf hooks assume rcu_read_lock is held.
nf_hook_egress() call to nf_hook_slow() needs to be wrapped
in rcu_read_(un)lock pair.
next prev parent reply other threads:[~2022-02-28 2:32 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-09 23:16 [PATCH net-next 00/32] Netfilter updates for net-next Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 01/32] netfilter: nfnetlink: add netns refcount tracker to struct nfulnl_instance Pablo Neira Ayuso
2022-01-10 0:30 ` patchwork-bot+netdevbpf
2022-01-09 23:16 ` [PATCH net-next 02/32] netfilter: nf_nat_masquerade: add netns refcount tracker to masq_dev_work Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 03/32] netfilter: nf_tables: remove rcu read-size lock Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 04/32] netfilter: nft_payload: WARN_ON_ONCE instead of BUG Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 05/32] netfilter: nf_tables: consolidate rule verdict trace call Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 06/32] netfilter: nf_tables: replace WARN_ON by WARN_ON_ONCE for unknown verdicts Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 07/32] netfilter: nf_tables: make counter support built-in Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 08/32] netfilter: conntrack: tag conntracks picked up in local out hook Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 09/32] netfilter: nat: force port remap to prevent shadowing well-known ports Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 10/32] netfilter: flowtable: remove ipv4/ipv6 modules Pablo Neira Ayuso
2022-01-11 9:01 ` Geert Uytterhoeven
2022-01-09 23:16 ` [PATCH net-next 11/32] netfilter: nft_set_pipapo_avx2: remove redundant pointer lt Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 12/32] netfilter: conntrack: Use max() instead of doing it manually Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 13/32] netfilter: conntrack: convert to refcount_t api Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 14/32] netfilter: core: move ip_ct_attach indirection to struct nf_ct_hook Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 15/32] netfilter: make function op structures const Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 16/32] netfilter: conntrack: avoid useless indirection during conntrack destruction Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 17/32] net: prefer nf_ct_put instead of nf_conntrack_put Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 18/32] netfilter: egress: avoid a lockdep splat Pablo Neira Ayuso
2022-02-28 2:13 ` Eric Dumazet
2022-02-28 2:32 ` Florian Westphal [this message]
2022-01-09 23:16 ` [PATCH net-next 19/32] netfilter: nft_connlimit: move stateful fields out of expression data Pablo Neira Ayuso
2022-01-10 18:20 ` Julian Wiedmann
2022-01-10 19:25 ` Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 20/32] netfilter: nft_last: " Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 21/32] netfilter: nft_quota: " Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 22/32] netfilter: nft_numgen: " Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 23/32] netfilter: nft_limit: rename stateful structure Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 24/32] netfilter: nft_limit: move stateful fields out of expression data Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 25/32] netfilter: nf_tables: add rule blob layout Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 26/32] netfilter: nf_tables: add NFT_REG32_NUM Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 27/32] netfilter: nf_tables: add register tracking infrastructure Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 28/32] netfilter: nft_payload: track register operations Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 29/32] netfilter: nft_meta: " Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 30/32] netfilter: nft_bitwise: " Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 31/32] netfilter: nft_payload: cancel register tracking after payload update Pablo Neira Ayuso
2022-01-09 23:16 ` [PATCH net-next 32/32] netfilter: nft_meta: cancel register tracking after meta update Pablo Neira Ayuso
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