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Message-ID: <20230509182948.3793097-1-edumazet@google.com>
Date: Tue, 9 May 2023 18:29:48 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>, syzbot <syzkaller@...glegroups.com>
Subject: [PATCH net] net: deal with most data-races in sk_wait_event()
__condition is evaluated twice in sk_wait_event() macro.
First invocation is lockless, and reads can race with writes,
as spotted by syzbot.
BUG: KCSAN: data-race in sk_stream_wait_connect / tcp_disconnect
write to 0xffff88812d83d6a0 of 4 bytes by task 9065 on cpu 1:
tcp_disconnect+0x2cd/0xdb0
inet_shutdown+0x19e/0x1f0 net/ipv4/af_inet.c:911
__sys_shutdown_sock net/socket.c:2343 [inline]
__sys_shutdown net/socket.c:2355 [inline]
__do_sys_shutdown net/socket.c:2363 [inline]
__se_sys_shutdown+0xf8/0x140 net/socket.c:2361
__x64_sys_shutdown+0x31/0x40 net/socket.c:2361
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 to 0xffff88812d83d6a0 of 4 bytes by task 9040 on cpu 0:
sk_stream_wait_connect+0x1de/0x3a0 net/core/stream.c:75
tcp_sendmsg_locked+0x2e4/0x2120 net/ipv4/tcp.c:1266
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1484
inet6_sendmsg+0x63/0x80 net/ipv6/af_inet6.c:651
sock_sendmsg_nosec net/socket.c:724 [inline]
sock_sendmsg net/socket.c:747 [inline]
__sys_sendto+0x246/0x300 net/socket.c:2142
__do_sys_sendto net/socket.c:2154 [inline]
__se_sys_sendto net/socket.c:2150 [inline]
__x64_sys_sendto+0x78/0x90 net/socket.c:2150
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: 0x00000000 -> 0x00000068
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/core/stream.c | 12 ++++++------
net/ipv4/tcp_bpf.c | 2 +-
net/llc/af_llc.c | 8 +++++---
net/smc/smc_close.c | 4 ++--
net/smc/smc_rx.c | 4 ++--
net/smc/smc_tx.c | 4 ++--
net/tipc/socket.c | 4 ++--
net/tls/tls_main.c | 3 ++-
8 files changed, 22 insertions(+), 19 deletions(-)
diff --git a/net/core/stream.c b/net/core/stream.c
index 434446ab14c578b2d4c4c0ff8467c7129f7c66d8..f5c4e47df16505571d575ff367b31d9ef6998bd6 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -73,8 +73,8 @@ int sk_stream_wait_connect(struct sock *sk, long *timeo_p)
add_wait_queue(sk_sleep(sk), &wait);
sk->sk_write_pending++;
done = sk_wait_event(sk, timeo_p,
- !sk->sk_err &&
- !((1 << sk->sk_state) &
+ !READ_ONCE(sk->sk_err) &&
+ !((1 << READ_ONCE(sk->sk_state)) &
~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)), &wait);
remove_wait_queue(sk_sleep(sk), &wait);
sk->sk_write_pending--;
@@ -87,9 +87,9 @@ EXPORT_SYMBOL(sk_stream_wait_connect);
* sk_stream_closing - Return 1 if we still have things to send in our buffers.
* @sk: socket to verify
*/
-static inline int sk_stream_closing(struct sock *sk)
+static int sk_stream_closing(const struct sock *sk)
{
- return (1 << sk->sk_state) &
+ return (1 << READ_ONCE(sk->sk_state)) &
(TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK);
}
@@ -142,8 +142,8 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p)
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
sk->sk_write_pending++;
- sk_wait_event(sk, ¤t_timeo, sk->sk_err ||
- (sk->sk_shutdown & SEND_SHUTDOWN) ||
+ sk_wait_event(sk, ¤t_timeo, READ_ONCE(sk->sk_err) ||
+ (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) ||
(sk_stream_memory_free(sk) &&
!vm_wait), &wait);
sk->sk_write_pending--;
diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
index ebf91751193706ccec1bb9cfac48be28b5e28337..2e9547467edbecbae7a8e01ab780de37064f6df3 100644
--- a/net/ipv4/tcp_bpf.c
+++ b/net/ipv4/tcp_bpf.c
@@ -168,7 +168,7 @@ static int tcp_msg_wait_data(struct sock *sk, struct sk_psock *psock,
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
ret = sk_wait_event(sk, &timeo,
!list_empty(&psock->ingress_msg) ||
- !skb_queue_empty(&sk->sk_receive_queue), &wait);
+ !skb_queue_empty_lockless(&sk->sk_receive_queue), &wait);
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
remove_wait_queue(sk_sleep(sk), &wait);
return ret;
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index da7fe94bea2eb8b6d1fe84bfdb8d1fa7cf5f6879..9ffbc667be6cf4c13d2f731e003510efeed8ee29 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -583,7 +583,8 @@ static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
add_wait_queue(sk_sleep(sk), &wait);
while (1) {
- if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
+ if (sk_wait_event(sk, &timeout,
+ READ_ONCE(sk->sk_state) == TCP_CLOSE, &wait))
break;
rc = -ERESTARTSYS;
if (signal_pending(current))
@@ -603,7 +604,8 @@ static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
add_wait_queue(sk_sleep(sk), &wait);
while (1) {
- if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
+ if (sk_wait_event(sk, &timeout,
+ READ_ONCE(sk->sk_state) != TCP_SYN_SENT, &wait))
break;
if (signal_pending(current) || !timeout)
break;
@@ -622,7 +624,7 @@ static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
while (1) {
rc = 0;
if (sk_wait_event(sk, &timeout,
- (sk->sk_shutdown & RCV_SHUTDOWN) ||
+ (READ_ONCE(sk->sk_shutdown) & RCV_SHUTDOWN) ||
(!llc_data_accept_state(llc->state) &&
!llc->remote_busy_flag &&
!llc->p_flag), &wait))
diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c
index 31db7438857c9f81fd336bfce74c5c92b7d275c6..dbdf03e8aa5b55f29d71e9f7c28169cac358740f 100644
--- a/net/smc/smc_close.c
+++ b/net/smc/smc_close.c
@@ -67,8 +67,8 @@ static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
rc = sk_wait_event(sk, &timeout,
!smc_tx_prepared_sends(&smc->conn) ||
- sk->sk_err == ECONNABORTED ||
- sk->sk_err == ECONNRESET ||
+ READ_ONCE(sk->sk_err) == ECONNABORTED ||
+ READ_ONCE(sk->sk_err) == ECONNRESET ||
smc->conn.killed,
&wait);
if (rc)
diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c
index 4380d32f5a5f96205d486dea4ff763435bc2e95d..9a2f3638d161d2ff7d7261835a5b13be63b11701 100644
--- a/net/smc/smc_rx.c
+++ b/net/smc/smc_rx.c
@@ -267,9 +267,9 @@ int smc_rx_wait(struct smc_sock *smc, long *timeo,
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
add_wait_queue(sk_sleep(sk), &wait);
rc = sk_wait_event(sk, timeo,
- sk->sk_err ||
+ READ_ONCE(sk->sk_err) ||
cflags->peer_conn_abort ||
- sk->sk_shutdown & RCV_SHUTDOWN ||
+ READ_ONCE(sk->sk_shutdown) & RCV_SHUTDOWN ||
conn->killed ||
fcrit(conn),
&wait);
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index f4b6a71ac488a40e1a36abe4562017fff7e98739..45128443f1f10ff8bea1dc65214c1db3beefc135 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -113,8 +113,8 @@ static int smc_tx_wait(struct smc_sock *smc, int flags)
break; /* at least 1 byte of free & no urgent data */
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
sk_wait_event(sk, &timeo,
- sk->sk_err ||
- (sk->sk_shutdown & SEND_SHUTDOWN) ||
+ READ_ONCE(sk->sk_err) ||
+ (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) ||
smc_cdc_rxed_any_close(conn) ||
(atomic_read(&conn->sndbuf_space) &&
!conn->urg_tx_pend),
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 37edfe10f8c6ffea553a54b24b9513bd2e18d694..dd73d71c02a99df7acd7ce3fb0d4a96d1778171d 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -314,9 +314,9 @@ static void tsk_rej_rx_queue(struct sock *sk, int error)
tipc_sk_respond(sk, skb, error);
}
-static bool tipc_sk_connected(struct sock *sk)
+static bool tipc_sk_connected(const struct sock *sk)
{
- return sk->sk_state == TIPC_ESTABLISHED;
+ return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
}
/* tipc_sk_type_connectionless - check if the socket is datagram socket
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index b32c112984dd9567fd9d07cc6850f234c1914a43..f2e7302a4d96b9f7ddd4ddf9afb6cac5672886e6 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -111,7 +111,8 @@ int wait_on_pending_writer(struct sock *sk, long *timeo)
break;
}
- if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
+ if (sk_wait_event(sk, timeo,
+ !READ_ONCE(sk->sk_write_pending), &wait))
break;
}
remove_wait_queue(sk_sleep(sk), &wait);
--
2.40.1.521.gf1e218fcd8-goog
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