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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: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-05-09 18:29:48 +00:00 committed by David S. Miller
parent e05a5f510f
commit d0ac89f6f9
8 changed files with 22 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
net/core/stream.c
View File

@ -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, &current_timeo, sk->sk_err ||
(sk->sk_shutdown & SEND_SHUTDOWN) ||
sk_wait_event(sk, &current_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--;

2
net/ipv4/tcp_bpf.c
View File

@ -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;

8
net/llc/af_llc.c
View File

@ -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))

4
net/smc/smc_close.c
View File

@ -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)

4
net/smc/smc_rx.c
View File

@ -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);

4
net/smc/smc_tx.c
View File

@ -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),

4
net/tipc/socket.c
View File

@ -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

3
net/tls/tls_main.c
View File

@ -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);