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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3253C54FB9 for ; Wed, 15 Nov 2023 19:35:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234389AbjKOTfC (ORCPT ); Wed, 15 Nov 2023 14:35:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234370AbjKOTfA (ORCPT ); Wed, 15 Nov 2023 14:35:00 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D29919E for ; Wed, 15 Nov 2023 11:34:57 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9291DC433CB; Wed, 15 Nov 2023 19:34:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700076896; bh=ArMOTo3XroasB7Xp+icAu2/gySThlA3z/eP3cwSOQuI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ydHU9tsm3oZeClT3bAd2PMevVQL6aUdhXO99ABZVml/ustSG/giNgkAMIs2fEaKYq vDY4/1no0iq1YaN5x+k/t08hOuPkBcENMoG6vG9CORRegztYId9eo45HB41MprjnUk f3rCiiXcnlLx5cuD6rEmbmJOFdtrWJxEpxJUXxVI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot , Eric Dumazet , Willem de Bruijn , Paolo Abeni , Sasha Levin Subject: [PATCH 6.6 060/603] udp: annotate data-races around udp->encap_type Date: Wed, 15 Nov 2023 14:10:05 -0500 Message-ID: <20231115191617.277433799@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115191613.097702445@linuxfoundation.org> References: <20231115191613.097702445@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 70a36f571362a8de8b8c02d21ae524fc776287f2 ] syzbot/KCSAN complained about UDP_ENCAP_L2TPINUDP setsockopt() racing. Add READ_ONCE()/WRITE_ONCE() to document races on this lockless field. syzbot report was: BUG: KCSAN: data-race in udp_lib_setsockopt / udp_lib_setsockopt read-write to 0xffff8881083603fa of 1 bytes by task 16557 on cpu 0: udp_lib_setsockopt+0x682/0x6c0 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2779 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697 __sys_setsockopt+0x1c9/0x230 net/socket.c:2263 __do_sys_setsockopt net/socket.c:2274 [inline] __se_sys_setsockopt net/socket.c:2271 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2271 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff8881083603fa of 1 bytes by task 16554 on cpu 1: udp_lib_setsockopt+0x682/0x6c0 udp_setsockopt+0x73/0xa0 net/ipv4/udp.c:2779 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3697 __sys_setsockopt+0x1c9/0x230 net/socket.c:2263 __do_sys_setsockopt net/socket.c:2274 [inline] __se_sys_setsockopt net/socket.c:2271 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2271 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x01 -> 0x05 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16554 Comm: syz-executor.5 Not tainted 6.5.0-rc7-syzkaller-00004-gf7757129e3de #0 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/gtp.c | 4 ++-- net/ipv4/udp.c | 9 +++++---- net/ipv4/xfrm4_input.c | 4 ++-- net/ipv6/udp.c | 5 +++-- net/ipv6/xfrm6_input.c | 4 ++-- net/l2tp/l2tp_core.c | 6 +++--- 6 files changed, 17 insertions(+), 15 deletions(-) diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c index b22596b18ee8c..b1919278e931f 100644 --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -630,7 +630,7 @@ static void __gtp_encap_destroy(struct sock *sk) gtp->sk0 = NULL; else gtp->sk1u = NULL; - udp_sk(sk)->encap_type = 0; + WRITE_ONCE(udp_sk(sk)->encap_type, 0); rcu_assign_sk_user_data(sk, NULL); release_sock(sk); sock_put(sk); @@ -682,7 +682,7 @@ static int gtp_encap_recv(struct sock *sk, struct sk_buff *skb) netdev_dbg(gtp->dev, "encap_recv sk=%p\n", sk); - switch (udp_sk(sk)->encap_type) { + switch (READ_ONCE(udp_sk(sk)->encap_type)) { case UDP_ENCAP_GTP0: netdev_dbg(gtp->dev, "received GTP0 packet\n"); ret = gtp0_udp_encap_recv(gtp, skb); diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 637a4faf9aff6..2eeab4af17a13 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -714,7 +714,7 @@ int __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) iph->saddr, uh->source, skb->dev->ifindex, inet_sdif(skb), udptable, NULL); - if (!sk || udp_sk(sk)->encap_type) { + if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { /* No socket for error: try tunnels before discarding */ if (static_branch_unlikely(&udp_encap_needed_key)) { sk = __udp4_lib_err_encap(net, iph, uh, udptable, sk, skb, @@ -2081,7 +2081,8 @@ static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) } nf_reset_ct(skb); - if (static_branch_unlikely(&udp_encap_needed_key) && up->encap_type) { + if (static_branch_unlikely(&udp_encap_needed_key) && + READ_ONCE(up->encap_type)) { int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); /* @@ -2684,7 +2685,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname, #endif fallthrough; case UDP_ENCAP_L2TPINUDP: - up->encap_type = val; + WRITE_ONCE(up->encap_type, val); udp_tunnel_encap_enable(sk); break; default: @@ -2785,7 +2786,7 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname, break; case UDP_ENCAP: - val = up->encap_type; + val = READ_ONCE(up->encap_type); break; case UDP_NO_CHECK6_TX: diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c index eac206a290d05..183f6dc372429 100644 --- a/net/ipv4/xfrm4_input.c +++ b/net/ipv4/xfrm4_input.c @@ -85,11 +85,11 @@ int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) struct udphdr *uh; struct iphdr *iph; int iphlen, len; - __u8 *udpdata; __be32 *udpdata32; - __u16 encap_type = up->encap_type; + u16 encap_type; + encap_type = READ_ONCE(up->encap_type); /* if this is not encapsulated socket, then just return now */ if (!encap_type) return 1; diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 90688877e9004..0e79d189613be 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -571,7 +571,7 @@ int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, inet6_iif(skb), inet6_sdif(skb), udptable, NULL); - if (!sk || udp_sk(sk)->encap_type) { + if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { /* No socket for error: try tunnels before discarding */ if (static_branch_unlikely(&udpv6_encap_needed_key)) { sk = __udp6_lib_err_encap(net, hdr, offset, uh, @@ -688,7 +688,8 @@ static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) } nf_reset_ct(skb); - if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { + if (static_branch_unlikely(&udpv6_encap_needed_key) && + READ_ONCE(up->encap_type)) { int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); /* diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c index 4907ab241d6be..4156387248e40 100644 --- a/net/ipv6/xfrm6_input.c +++ b/net/ipv6/xfrm6_input.c @@ -81,14 +81,14 @@ int xfrm6_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) struct ipv6hdr *ip6h; int len; int ip6hlen = sizeof(struct ipv6hdr); - __u8 *udpdata; __be32 *udpdata32; - __u16 encap_type = up->encap_type; + u16 encap_type; if (skb->protocol == htons(ETH_P_IP)) return xfrm4_udp_encap_rcv(sk, skb); + encap_type = READ_ONCE(up->encap_type); /* if this is not encapsulated socket, then just return now */ if (!encap_type) return 1; diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 03608d3ded4b8..8d21ff25f1602 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -1139,9 +1139,9 @@ static void l2tp_tunnel_destruct(struct sock *sk) switch (tunnel->encap) { case L2TP_ENCAPTYPE_UDP: /* No longer an encapsulation socket. See net/ipv4/udp.c */ - (udp_sk(sk))->encap_type = 0; - (udp_sk(sk))->encap_rcv = NULL; - (udp_sk(sk))->encap_destroy = NULL; + WRITE_ONCE(udp_sk(sk)->encap_type, 0); + udp_sk(sk)->encap_rcv = NULL; + udp_sk(sk)->encap_destroy = NULL; break; case L2TP_ENCAPTYPE_IP: break; -- 2.42.0