From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08BC7C43465 for ; Fri, 18 Sep 2020 03:00:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1A9B206B7 for ; Fri, 18 Sep 2020 03:00:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600398049; bh=cNeWonc/Mz2ib66EIcvihiYK231C6cYC3pINlfnMSo0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nL0/JIpwiwHwWYajKbwAVvOfalJPyLS+CrT5nqJJMMXOeEWV1LHBZX+hwyGxWTvzT g5Avl7RmJ69yvKxkCq2gHa4ryRgXciI3itveGfbVuhwmZN+YaqGMFoS9UzQX7ju4fX WtgYtpTbS9+jR/BP4CAJZ5fQXyfnFtHd47MIDB/c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727656AbgIRDAj (ORCPT ); Thu, 17 Sep 2020 23:00:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:53924 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727567AbgIRCFe (ORCPT ); Thu, 17 Sep 2020 22:05:34 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 315BE235FD; Fri, 18 Sep 2020 02:05:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394734; bh=cNeWonc/Mz2ib66EIcvihiYK231C6cYC3pINlfnMSo0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RQeTPu717YKI0SvHzRcgByP2XCNywrTj8sHXzXD/kuNZD3THFcykFDOXSKmyTr0uk ZsQJkArqKB3+1WRWvuzs4AQIximt4ITpGHmtNLQ4Y3l+WSVQD2kz4vK7lKB5nsjvMB qjvm3Hme4AkkJ847wPu+V1UoLlBp2DjfWUl5p5/0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Qian Cai , Florian Westphal , Pablo Neira Ayuso , Sasha Levin , netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 215/330] netfilter: nf_tables: silence a RCU-list warning in nft_table_lookup() Date: Thu, 17 Sep 2020 21:59:15 -0400 Message-Id: <20200918020110.2063155-215-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020110.2063155-1-sashal@kernel.org> References: <20200918020110.2063155-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org From: Qian Cai [ Upstream commit 0a6a9515fe390976cd762c52d8d4f446d7a14285 ] 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 Acked-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- 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 2023650c27249..ff2d2b514506e 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -456,7 +456,8 @@ 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)) -- 2.25.1