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 953382AF07; Mon, 28 Oct 2024 06:48:28 +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=1730098108; cv=none; b=N7bH7/zIbjxKXF7mIlfIskpuZ89FthMoJtpcCFHH/x27SwavuR5anAeV35KtS6JmADf1gOY33ofMx2jLA3qla1wVOh4F4/tN19z1O646Bf9bqR+9w5yF4AtUSHryIikbJFTYYl8+su1Iekq8rkdX4F0UgZBzJMqvFEeb4CYqv3A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730098108; c=relaxed/simple; bh=OS0xlP7lsTsd5luk6CdZVCrfKf4GexVqSuvGoT7heU8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Cz3cYx+TsyVvktyF/77FygW5rBcZSjDqBRN6jQxCfxld7eU/CpDogboSWSKQcYbJcHI2JU/dja7JUQIP/poY2zINrL+8XDc5birTshUVYC11lp8WA2wl/qxdpavqN/l90odutHCOy1oxmUiAp/7KIWEog/0Jo/k+Qr72oXQx84M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eOU4Qpfu; 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="eOU4Qpfu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31F66C4CEC3; Mon, 28 Oct 2024 06:48:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730098108; bh=OS0xlP7lsTsd5luk6CdZVCrfKf4GexVqSuvGoT7heU8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eOU4QpfuRzhrWTohnS3J69PMxLIX7u3Q4iPog+wS+4rTwsUweTaQjGJ8zkk5MmjB6 gJNojU9Z/P1Eb6TLKW6FwCDQ/+hn7fNvNE6T1CzugMM8Ekf9GFIlu8AjjP9s+CrRoM 9sU5FmEGsSYlFIAx53aJvea/d1c5pBI/+3YXKPPc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , James Chapman , Tom Parkin , Johannes Berg , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.11 080/261] genetlink: hold RCU in genlmsg_mcast() Date: Mon, 28 Oct 2024 07:23:42 +0100 Message-ID: <20241028062314.034665617@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241028062312.001273460@linuxfoundation.org> References: <20241028062312.001273460@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 56440d7ec28d60f8da3bfa09062b3368ff9b16db ] While running net selftests with CONFIG_PROVE_RCU_LIST=y I saw one lockdep splat [1]. genlmsg_mcast() uses for_each_net_rcu(), and must therefore hold RCU. Instead of letting all callers guard genlmsg_multicast_allns() with a rcu_read_lock()/rcu_read_unlock() pair, do it in genlmsg_mcast(). This also means the @flags parameter is useless, we need to always use GFP_ATOMIC. [1] [10882.424136] ============================= [10882.424166] WARNING: suspicious RCU usage [10882.424309] 6.12.0-rc2-virtme #1156 Not tainted [10882.424400] ----------------------------- [10882.424423] net/netlink/genetlink.c:1940 RCU-list traversed in non-reader section!! [10882.424469] other info that might help us debug this: [10882.424500] rcu_scheduler_active = 2, debug_locks = 1 [10882.424744] 2 locks held by ip/15677: [10882.424791] #0: ffffffffb6b491b0 (cb_lock){++++}-{3:3}, at: genl_rcv (net/netlink/genetlink.c:1219) [10882.426334] #1: ffffffffb6b49248 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg (net/netlink/genetlink.c:61 net/netlink/genetlink.c:57 net/netlink/genetlink.c:1209) [10882.426465] stack backtrace: [10882.426805] CPU: 14 UID: 0 PID: 15677 Comm: ip Not tainted 6.12.0-rc2-virtme #1156 [10882.426919] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [10882.427046] Call Trace: [10882.427131] [10882.427244] dump_stack_lvl (lib/dump_stack.c:123) [10882.427335] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) [10882.427387] genlmsg_multicast_allns (net/netlink/genetlink.c:1940 (discriminator 7) net/netlink/genetlink.c:1977 (discriminator 7)) [10882.427436] l2tp_tunnel_notify.constprop.0 (net/l2tp/l2tp_netlink.c:119) l2tp_netlink [10882.427683] l2tp_nl_cmd_tunnel_create (net/l2tp/l2tp_netlink.c:253) l2tp_netlink [10882.427748] genl_family_rcv_msg_doit (net/netlink/genetlink.c:1115) [10882.427834] genl_rcv_msg (net/netlink/genetlink.c:1195 net/netlink/genetlink.c:1210) [10882.427877] ? __pfx_l2tp_nl_cmd_tunnel_create (net/l2tp/l2tp_netlink.c:186) l2tp_netlink [10882.427927] ? __pfx_genl_rcv_msg (net/netlink/genetlink.c:1201) [10882.427959] netlink_rcv_skb (net/netlink/af_netlink.c:2551) [10882.428069] genl_rcv (net/netlink/genetlink.c:1220) [10882.428095] netlink_unicast (net/netlink/af_netlink.c:1332 net/netlink/af_netlink.c:1357) [10882.428140] netlink_sendmsg (net/netlink/af_netlink.c:1901) [10882.428210] ____sys_sendmsg (net/socket.c:729 (discriminator 1) net/socket.c:744 (discriminator 1) net/socket.c:2607 (discriminator 1)) Fixes: 33f72e6f0c67 ("l2tp : multicast notification to the registered listeners") Signed-off-by: Eric Dumazet Cc: James Chapman Cc: Tom Parkin Cc: Johannes Berg Link: https://patch.msgid.link/20241011171217.3166614-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/target/target_core_user.c | 2 +- include/net/genetlink.h | 3 +-- net/l2tp/l2tp_netlink.c | 4 ++-- net/netlink/genetlink.c | 28 ++++++++++++++-------------- net/wireless/nl80211.c | 8 ++------ 5 files changed, 20 insertions(+), 25 deletions(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 7eb94894bd68f..717931267bda0 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -2130,7 +2130,7 @@ static int tcmu_netlink_event_send(struct tcmu_dev *udev, } ret = genlmsg_multicast_allns(&tcmu_genl_family, skb, 0, - TCMU_MCGRP_CONFIG, GFP_KERNEL); + TCMU_MCGRP_CONFIG); /* Wait during an add as the listener may not be up yet */ if (ret == 0 || diff --git a/include/net/genetlink.h b/include/net/genetlink.h index 9ab49bfeae789..c1d91f1d20f6c 100644 --- a/include/net/genetlink.h +++ b/include/net/genetlink.h @@ -531,13 +531,12 @@ static inline int genlmsg_multicast(const struct genl_family *family, * @skb: netlink message as socket buffer * @portid: own netlink portid to avoid sending to yourself * @group: offset of multicast group in groups array - * @flags: allocation flags * * This function must hold the RTNL or rcu_read_lock(). */ int genlmsg_multicast_allns(const struct genl_family *family, struct sk_buff *skb, u32 portid, - unsigned int group, gfp_t flags); + unsigned int group); /** * genlmsg_unicast - unicast a netlink message diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c index fc43ecbd128cc..28e77a222a39b 100644 --- a/net/l2tp/l2tp_netlink.c +++ b/net/l2tp/l2tp_netlink.c @@ -116,7 +116,7 @@ static int l2tp_tunnel_notify(struct genl_family *family, NLM_F_ACK, tunnel, cmd); if (ret >= 0) { - ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); + ret = genlmsg_multicast_allns(family, msg, 0, 0); /* We don't care if no one is listening */ if (ret == -ESRCH) ret = 0; @@ -144,7 +144,7 @@ static int l2tp_session_notify(struct genl_family *family, NLM_F_ACK, session, cmd); if (ret >= 0) { - ret = genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC); + ret = genlmsg_multicast_allns(family, msg, 0, 0); /* We don't care if no one is listening */ if (ret == -ESRCH) ret = 0; diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index feb54c63a1165..07ad65774fe29 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -1501,15 +1501,11 @@ static int genl_ctrl_event(int event, const struct genl_family *family, if (IS_ERR(msg)) return PTR_ERR(msg); - if (!family->netnsok) { + if (!family->netnsok) genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0, 0, GFP_KERNEL); - } else { - rcu_read_lock(); - genlmsg_multicast_allns(&genl_ctrl, msg, 0, - 0, GFP_ATOMIC); - rcu_read_unlock(); - } + else + genlmsg_multicast_allns(&genl_ctrl, msg, 0, 0); return 0; } @@ -1929,23 +1925,23 @@ static int __init genl_init(void) core_initcall(genl_init); -static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, - gfp_t flags) +static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group) { struct sk_buff *tmp; struct net *net, *prev = NULL; bool delivered = false; int err; + rcu_read_lock(); for_each_net_rcu(net) { if (prev) { - tmp = skb_clone(skb, flags); + tmp = skb_clone(skb, GFP_ATOMIC); if (!tmp) { err = -ENOMEM; goto error; } err = nlmsg_multicast(prev->genl_sock, tmp, - portid, group, flags); + portid, group, GFP_ATOMIC); if (!err) delivered = true; else if (err != -ESRCH) @@ -1954,27 +1950,31 @@ static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group, prev = net; } + err = nlmsg_multicast(prev->genl_sock, skb, portid, group, GFP_ATOMIC); + + rcu_read_unlock(); - err = nlmsg_multicast(prev->genl_sock, skb, portid, group, flags); if (!err) delivered = true; else if (err != -ESRCH) return err; return delivered ? 0 : -ESRCH; error: + rcu_read_unlock(); + kfree_skb(skb); return err; } int genlmsg_multicast_allns(const struct genl_family *family, struct sk_buff *skb, u32 portid, - unsigned int group, gfp_t flags) + unsigned int group) { if (WARN_ON_ONCE(group >= family->n_mcgrps)) return -EINVAL; group = family->mcgrp_offset + group; - return genlmsg_mcast(skb, portid, group, flags); + return genlmsg_mcast(skb, portid, group); } EXPORT_SYMBOL(genlmsg_multicast_allns); diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index f18e1716339e0..3766efacfd64f 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -17967,10 +17967,8 @@ void nl80211_common_reg_change_event(enum nl80211_commands cmd_id, genlmsg_end(msg, hdr); - rcu_read_lock(); genlmsg_multicast_allns(&nl80211_fam, msg, 0, - NL80211_MCGRP_REGULATORY, GFP_ATOMIC); - rcu_read_unlock(); + NL80211_MCGRP_REGULATORY); return; @@ -18703,10 +18701,8 @@ void nl80211_send_beacon_hint_event(struct wiphy *wiphy, genlmsg_end(msg, hdr); - rcu_read_lock(); genlmsg_multicast_allns(&nl80211_fam, msg, 0, - NL80211_MCGRP_REGULATORY, GFP_ATOMIC); - rcu_read_unlock(); + NL80211_MCGRP_REGULATORY); return; -- 2.43.0