From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 785B91DD0FE; Mon, 6 Jan 2025 15:49:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736178567; cv=none; b=QfeTQHi6oPVmAZWlntfutrpBl3+y543WENybP3zxRWq89FkWybC+6x7QurV22UYSgCjK4M/Fi3SXmO7QkFZlNjcI3dn8h0qn5/hfx9VhsSk4UubQRj0FUADBcw+DP9OwrNtUfHzHaL4Ei6pdKRI4mX0ZBkqK3Wpq7mr2weddDQ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736178567; c=relaxed/simple; bh=HV/eNpsaF1I0qTr0HMMkdCP8ANPNC57OgYF7+k6v4jA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VKnyKAU5OZByZf6TGJrA3gDHFS0PjFxMc0OK1fNzjv9cBTVm28I+NbOh+YSfs7DW+bvDqkZ6uBxcnTD5+gmkUrOdb1wIEXnMSrnhxSSkd2/0jkwbXfTbtVQbSgsxKw3MV/t1eim/f4seps/t50eIg3XSxjFKCgkeEsBtxLKcCf8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BcksjHoR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BcksjHoR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F13AFC4CED2; Mon, 6 Jan 2025 15:49:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1736178567; bh=HV/eNpsaF1I0qTr0HMMkdCP8ANPNC57OgYF7+k6v4jA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BcksjHoRmbBPmbP0WqngTgt8QTR5CzHmmgY+AmQfavgdWUIX+VoRIseyoTUX5yVvs 8bBVZljScU8isqZfLfjjhExBBRC6Kz1YsTNRaS3aySutowDkAI8SKnjnqj9OK3ROWs jJKPm4nveEwQDIr08QUfOLJE1LcudOjdoaO/Ga+Y= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Phil Sutter , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.15 022/168] netfilter: ipset: Fix for recursive locking warning Date: Mon, 6 Jan 2025 16:15:30 +0100 Message-ID: <20250106151139.301506339@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250106151138.451846855@linuxfoundation.org> References: <20250106151138.451846855@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Phil Sutter [ Upstream commit 70b6f46a4ed8bd56c85ffff22df91e20e8c85e33 ] With CONFIG_PROVE_LOCKING, when creating a set of type bitmap:ip, adding it to a set of type list:set and populating it from iptables SET target triggers a kernel warning: | WARNING: possible recursive locking detected | 6.12.0-rc7-01692-g5e9a28f41134-dirty #594 Not tainted | -------------------------------------------- | ping/4018 is trying to acquire lock: | ffff8881094a6848 (&set->lock){+.-.}-{2:2}, at: ip_set_add+0x28c/0x360 [ip_set] | | but task is already holding lock: | ffff88811034c048 (&set->lock){+.-.}-{2:2}, at: ip_set_add+0x28c/0x360 [ip_set] This is a false alarm: ipset does not allow nested list:set type, so the loop in list_set_kadd() can never encounter the outer set itself. No other set type supports embedded sets, so this is the only case to consider. To avoid the false report, create a distinct lock class for list:set type ipset locks. Fixes: f830837f0eed ("netfilter: ipset: list:set set type support") Signed-off-by: Phil Sutter Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/ipset/ip_set_list_set.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/ipset/ip_set_list_set.c b/net/netfilter/ipset/ip_set_list_set.c index 902ff2f3bc72..5cc35b553a04 100644 --- a/net/netfilter/ipset/ip_set_list_set.c +++ b/net/netfilter/ipset/ip_set_list_set.c @@ -611,6 +611,8 @@ init_list_set(struct net *net, struct ip_set *set, u32 size) return true; } +static struct lock_class_key list_set_lockdep_key; + static int list_set_create(struct net *net, struct ip_set *set, struct nlattr *tb[], u32 flags) @@ -627,6 +629,7 @@ list_set_create(struct net *net, struct ip_set *set, struct nlattr *tb[], if (size < IP_SET_LIST_MIN_SIZE) size = IP_SET_LIST_MIN_SIZE; + lockdep_set_class(&set->lock, &list_set_lockdep_key); set->variant = &set_variant; set->dsize = ip_set_elem_len(set, tb, sizeof(struct set_elem), __alignof__(struct set_elem)); -- 2.39.5