From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 14/28] netfilter: nf_tables: silence a RCU-list warning in nft_table_lookup()
Date: Mon, 30 Mar 2020 21:21:22 +0200 [thread overview]
Message-ID: <20200330192136.230459-15-pablo@netfilter.org> (raw)
In-Reply-To: <20200330192136.230459-1-pablo@netfilter.org>
From: Qian Cai <cai@lca.pw>
It is safe to traverse &net->nft.tables with &net->nft.commit_mutex
held using list_for_each_entry_rcu(). Silence the PROVE_RCU_LIST false
positive,
WARNING: suspicious RCU usage
net/netfilter/nf_tables_api.c:523 RCU-list traversed in non-reader section!!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
1 lock held by iptables/1384:
#0: ffffffff9745c4a8 (&net->nft.commit_mutex){+.+.}, at: nf_tables_valid_genid+0x25/0x60 [nf_tables]
Call Trace:
dump_stack+0xa1/0xea
lockdep_rcu_suspicious+0x103/0x10d
nft_table_lookup.part.0+0x116/0x120 [nf_tables]
nf_tables_newtable+0x12c/0x7d0 [nf_tables]
nfnetlink_rcv_batch+0x559/0x1190 [nfnetlink]
nfnetlink_rcv+0x1da/0x210 [nfnetlink]
netlink_unicast+0x306/0x460
netlink_sendmsg+0x44b/0x770
____sys_sendmsg+0x46b/0x4a0
___sys_sendmsg+0x138/0x1a0
__sys_sendmsg+0xb6/0x130
__x64_sys_sendmsg+0x48/0x50
do_syscall_64+0x69/0xf4
entry_SYSCALL_64_after_hwframe+0x49/0xb3
Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_tables_api.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index ace325218edb..c1e04ac21392 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -520,7 +520,8 @@ static struct nft_table *nft_table_lookup(const struct net *net,
if (nla == NULL)
return ERR_PTR(-EINVAL);
- list_for_each_entry_rcu(table, &net->nft.tables, list) {
+ list_for_each_entry_rcu(table, &net->nft.tables, list,
+ lockdep_is_held(&net->nft.commit_mutex)) {
if (!nla_strcmp(nla, table->name) &&
table->family == family &&
nft_active_genmask(table, genmask))
--
2.11.0
next prev parent reply other threads:[~2020-03-30 19:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 19:21 [PATCH 00/28] Netfilter/IPVS updates for net-next Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 01/28] netfilter: nf_tables: move nft_expr_clone() to nf_tables_api.c Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 02/28] netfilter: nf_tables: pass context to nft_set_destroy() Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 03/28] netfilter: nf_tables: allow to specify stateful expression in set definition Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 04/28] netfilter: nf_tables: fix double-free on set expression from the error path Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 05/28] netfilter: nf_tables: add nft_set_elem_expr_destroy() and use it Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 06/28] netfilter: flowtable: fix NULL pointer dereference in tunnel offload support Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 07/28] netfilter: ctnetlink: Add missing annotation for ctnetlink_parse_nat_setup() Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 08/28] netfilter: conntrack: Add missing annotations for nf_conntrack_all_lock() and nf_conntrack_all_unlock() Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 09/28] ipvs: optimize tunnel dumps for icmp errors Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 10/28] netfilter: conntrack: export nf_ct_acct_update() Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 11/28] netfilter: nf_tables: add enum nft_flowtable_flags to uapi Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 12/28] netfilter: flowtable: add counter support Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 13/28] netfilter: flowtable: Fix incorrect tc_setup_type type Pablo Neira Ayuso
2020-03-30 19:21 ` Pablo Neira Ayuso [this message]
2020-03-30 19:21 ` [PATCH 15/28] netfilter: flowtable: Use rw sem as flow block lock Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 16/28] netfilter: flowtable: Use work entry per offload command Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 17/28] netfilter: nf_queue: make nf_queue_entry_release_refs static Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 18/28] netfilter: nf_queue: place bridge physports into queue_entry struct Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 19/28] netfilter: nf_queue: do not release refcouts until nf_reinject is done Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 20/28] netfilter: nf_queue: prefer nf_queue_entry_free Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 21/28] netfilter: ctnetlink: be more strict when NF_CONNTRACK_MARK is not set Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 22/28] netfilter: nft_set_bitmap: initialize set element extension in lookups Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 23/28] netfilter: nft_dynset: validate set expression definition Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 24/28] netfilter: nf_tables: skip set types that do not support for expressions Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 25/28] netfilter: conntrack: add nf_ct_acct_add() Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 26/28] netfilter: flowtable: add counter support in HW offload Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 27/28] netfilter: nft_exthdr: fix endianness of tcp option cast Pablo Neira Ayuso
2020-03-30 19:21 ` [PATCH 28/28] ipvs: fix uninitialized variable warning Pablo Neira Ayuso
2020-03-31 3:11 ` [PATCH 00/28] Netfilter/IPVS updates for net-next David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200330192136.230459-15-pablo@netfilter.org \
--to=pablo@netfilter.org \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
--cc=netfilter-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).