mptcp: fix inconsistent state on fastopen race

Paolo Abeni · davem330 · commit 4fd19a307016 · 2023-12-17T20:54:22.000Z
The netlink PM can race with fastopen self-connect attempts, shutting down the first subflow via: MPTCP_PM_CMD_DEL_ADDR -> mptcp_nl_remove_id_zero_address -> mptcp_pm_nl_rm_subflow_received -> mptcp_close_ssk and transitioning such subflow to FIN_WAIT1 status before the syn-ack packet is processed. The MPTCP code does not react to such state change, leaving the connection in not-fallback status and the subflow handshake uncompleted, triggering the following splat: WARNING: CPU: 0 PID: 10630 at net/mptcp/subflow.c:1405 subflow_data_ready+0x39f/0x690 net/mptcp/subflow.c:1405 Modules linked in: CPU: 0 PID: 10630 Comm: kworker/u4:11 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:subflow_data_ready+0x39f/0x690 net/mptcp/subflow.c:1405 Code: 18 89 ee e8 e3 d2 21 f7 40 84 ed 75 1f e8 a9 d7 21 f7 44 89 fe bf 07 00 00 00 e8 0c d3 21 f7 41 83 ff 07 74 07 e8 91 d7 21 f7 <0f> 0b e8 8a d7 21 f7 48 89 df e8 d2 b2 ff ff 31 ff 89 c5 89 c6 e8 RSP: 0018:ffffc90000007448 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888031efc700 RCX: ffffffff8a65baf4 RDX: ffff888043222140 RSI: ffffffff8a65baff RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 000000000000000b R11: 0000000000000000 R12: 1ffff92000000e89 R13: ffff88807a534d80 R14: ffff888021c11a00 R15: 000000000000000b FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa19a0ffc81 CR3: 000000007a2db000 CR4: 00000000003506f0 DR0: 000000000000d8dd DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: <IRQ> tcp_data_ready+0x14c/0x5b0 net/ipv4/tcp_input.c:5128 tcp_data_queue+0x19c3/0x5190 net/ipv4/tcp_input.c:5208 tcp_rcv_state_process+0x11ef/0x4e10 net/ipv4/tcp_input.c:6844 tcp_v4_do_rcv+0x369/0xa10 net/ipv4/tcp_ipv4.c:1929 tcp_v4_rcv+0x3888/0x3b30 net/ipv4/tcp_ipv4.c:2329 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x1b6/0x550 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1c4/0x2e0 net/ipv4/ip_input.c:449 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0xce/0x440 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5527 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5641 process_backlog+0x101/0x6b0 net/core/dev.c:5969 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6531 napi_poll net/core/dev.c:6600 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6733 __do_softirq+0x21a/0x968 kernel/softirq.c:553 do_softirq kernel/softirq.c:454 [inline] do_softirq+0xaa/0xe0 kernel/softirq.c:441 </IRQ> <TASK> __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:381 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x1ce/0x3c0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x9b1/0x10e0 net/batman-adv/network-coding.c:722 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> To address the issue, catch the racing subflow state change and use it to cause the MPTCP fallback. Such fallback is also used to cause the first subflow state propagation to the msk socket via mptcp_set_connected(). After this change, the first subflow can additionally propagate the TCP_FIN_WAIT1 state, so rename the helper accordingly. Finally, if the state propagation is delayed to the msk release callback, the first subflow can change to a different state in between. Cache the relevant target state in a new msk-level field and use such value to update the msk state at release time. Fixes: 1e777f3 ("mptcp: add MSG_FASTOPEN sendmsg flag support") Cc: stable@vger.kernel.org Reported-by: <syzbot+c53d4d3ddb327e80bc51@syzkaller.appspotmail.com> Closes: multipath-tcp/mptcp_net-next#458 Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts <matttbe@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
@@ -3402,12 +3402,12 @@ static void mptcp_release_cb(struct sock *sk)
 	if (__test_and_clear_bit(MPTCP_CLEAN_UNA, &msk->cb_flags))
 		__mptcp_clean_una_wakeup(sk);
 	if (unlikely(msk->cb_flags)) {
-		/* be sure to set the current sk state before taking actions
+		/* be sure to sync the msk state before taking actions
 		 * depending on sk_state (MPTCP_ERROR_REPORT)
 		 * On sk release avoid actions depending on the first subflow
 		 */
-		if (__test_and_clear_bit(MPTCP_CONNECTED, &msk->cb_flags) && msk->first)
-			__mptcp_set_connected(sk);
+		if (__test_and_clear_bit(MPTCP_SYNC_STATE, &msk->cb_flags) && msk->first)
+			__mptcp_sync_state(sk, msk->pending_state);
 		if (__test_and_clear_bit(MPTCP_ERROR_REPORT, &msk->cb_flags))
 			__mptcp_error_report(sk);
 		if (__test_and_clear_bit(MPTCP_SYNC_SNDBUF, &msk->cb_flags))
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
@@ -124,7 +124,7 @@
 #define MPTCP_ERROR_REPORT	3
 #define MPTCP_RETRANSMIT	4
 #define MPTCP_FLUSH_JOIN_LIST	5
-#define MPTCP_CONNECTED		6
+#define MPTCP_SYNC_STATE	6
 #define MPTCP_SYNC_SNDBUF	7
 
 struct mptcp_skb_cb {
@@ -296,6 +296,9 @@ struct mptcp_sock {
 	bool		use_64bit_ack; /* Set when we received a 64-bit DSN */
 	bool		csum_enabled;
 	bool		allow_infinite_fallback;
+	u8		pending_state; /* A subflow asked to set this sk_state,
+					* protected by the msk data lock
+					*/
 	u8		mpc_endpoint_id;
 	u8		recvmsg_inq:1,
 			cork:1,
@@ -728,7 +731,7 @@ void mptcp_get_options(const struct sk_buff *skb,
 		       struct mptcp_options_received *mp_opt);
 
 void mptcp_finish_connect(struct sock *sk);
-void __mptcp_set_connected(struct sock *sk);
+void __mptcp_sync_state(struct sock *sk, int state);
 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout);
 
 static inline void mptcp_stop_tout_timer(struct sock *sk)
@@ -1115,7 +1118,7 @@ static inline bool subflow_simultaneous_connect(struct sock *sk)
 {
 	struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
 
-	return sk->sk_state == TCP_ESTABLISHED &&
+	return (1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_FIN_WAIT1) &&
 	       is_active_ssk(subflow) &&
 	       !subflow->conn_finished;
 }
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
@@ -419,22 +419,28 @@ static bool subflow_use_different_dport(struct mptcp_sock *msk, const struct soc
 	return inet_sk(sk)->inet_dport != inet_sk((struct sock *)msk)->inet_dport;
 }
 
-void __mptcp_set_connected(struct sock *sk)
+void __mptcp_sync_state(struct sock *sk, int state)
 {
-	__mptcp_propagate_sndbuf(sk, mptcp_sk(sk)->first);
+	struct mptcp_sock *msk = mptcp_sk(sk);
+
+	__mptcp_propagate_sndbuf(sk, msk->first);
 	if (sk->sk_state == TCP_SYN_SENT) {
-		inet_sk_state_store(sk, TCP_ESTABLISHED);
+		inet_sk_state_store(sk, state);
 		sk->sk_state_change(sk);
 	}
 }
 
-static void mptcp_set_connected(struct sock *sk)
+static void mptcp_propagate_state(struct sock *sk, struct sock *ssk)
 {
+	struct mptcp_sock *msk = mptcp_sk(sk);
+
 	mptcp_data_lock(sk);
-	if (!sock_owned_by_user(sk))
-		__mptcp_set_connected(sk);
-	else
-		__set_bit(MPTCP_CONNECTED, &mptcp_sk(sk)->cb_flags);
+	if (!sock_owned_by_user(sk)) {
+		__mptcp_sync_state(sk, ssk->sk_state);
+	} else {
+		msk->pending_state = ssk->sk_state;
+		__set_bit(MPTCP_SYNC_STATE, &msk->cb_flags);
+	}
 	mptcp_data_unlock(sk);
 }
 
@@ -496,7 +502,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 		subflow_set_remote_key(msk, subflow, &mp_opt);
 		MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEACTIVEACK);
 		mptcp_finish_connect(sk);
-		mptcp_set_connected(parent);
+		mptcp_propagate_state(parent, sk);
 	} else if (subflow->request_join) {
 		u8 hmac[SHA256_DIGEST_SIZE];
 
@@ -540,7 +546,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 	} else if (mptcp_check_fallback(sk)) {
 fallback:
 		mptcp_rcv_space_init(msk, sk);
-		mptcp_set_connected(parent);
+		mptcp_propagate_state(parent, sk);
 	}
 	return;
 
@@ -1740,7 +1746,7 @@ static void subflow_state_change(struct sock *sk)
 		mptcp_rcv_space_init(msk, sk);
 		pr_fallback(msk);
 		subflow->conn_finished = 1;
-		mptcp_set_connected(parent);
+		mptcp_propagate_state(parent, sk);
 	}
 
 	/* as recvmsg() does not acquire the subflow socket for ssk selection
