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Date: Wed, 6 Nov 2019 12:59:33 -0800
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Soheil Hassas Yeganeh <soheil@...gle.com>,
syzbot <syzkaller@...glegroups.com>
Subject: [PATCH net-next] tcp: fix data-race in tcp_recvmsg()
Reading tp->recvmsg_inq after socket lock is released
raises a KCSAN warning [1]
Replace has_tss & has_cmsg by cmsg_flags and make
sure to not read tp->recvmsg_inq a second time.
[1]
BUG: KCSAN: data-race in tcp_chrono_stop / tcp_recvmsg
write to 0xffff888126adef24 of 2 bytes by interrupt on cpu 0:
tcp_chrono_set net/ipv4/tcp_output.c:2309 [inline]
tcp_chrono_stop+0x14c/0x280 net/ipv4/tcp_output.c:2338
tcp_clean_rtx_queue net/ipv4/tcp_input.c:3165 [inline]
tcp_ack+0x274f/0x3170 net/ipv4/tcp_input.c:3688
tcp_rcv_established+0x37e/0xf50 net/ipv4/tcp_input.c:5696
tcp_v4_do_rcv+0x381/0x4e0 net/ipv4/tcp_ipv4.c:1561
tcp_v4_rcv+0x19dc/0x1bb0 net/ipv4/tcp_ipv4.c:1942
ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:442 [inline]
ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523
__netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5010
__netif_receive_skb+0x37/0xf0 net/core/dev.c:5124
netif_receive_skb_internal+0x59/0x190 net/core/dev.c:5214
napi_skb_finish net/core/dev.c:5677 [inline]
napi_gro_receive+0x28f/0x330 net/core/dev.c:5710
read to 0xffff888126adef25 of 1 bytes by task 7275 on cpu 1:
tcp_recvmsg+0x77b/0x1a30 net/ipv4/tcp.c:2187
inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838
sock_recvmsg_nosec net/socket.c:871 [inline]
sock_recvmsg net/socket.c:889 [inline]
sock_recvmsg+0x92/0xb0 net/socket.c:885
sock_read_iter+0x15f/0x1e0 net/socket.c:967
call_read_iter include/linux/fs.h:1889 [inline]
new_sync_read+0x389/0x4f0 fs/read_write.c:414
__vfs_read+0xb1/0xc0 fs/read_write.c:427
vfs_read fs/read_write.c:461 [inline]
vfs_read+0x143/0x2c0 fs/read_write.c:446
ksys_read+0xd5/0x1b0 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read fs/read_write.c:595 [inline]
__x64_sys_read+0x4c/0x60 fs/read_write.c:595
do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7275 Comm: sshd Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Fixes: b75eba76d3d7 ("tcp: send in-queue bytes in cmsg upon read")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Reported-by: syzbot <syzkaller@...glegroups.com>
---
net/ipv4/tcp.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 8fb4fefcfd544943e9c92870d4d0da25f3813448..9b48aec29aca6317adf7e96c8d058c859b1309c6 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1958,8 +1958,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
struct sk_buff *skb, *last;
u32 urg_hole = 0;
struct scm_timestamping_internal tss;
- bool has_tss = false;
- bool has_cmsg;
+ int cmsg_flags;
if (unlikely(flags & MSG_ERRQUEUE))
return inet_recv_error(sk, msg, len, addr_len);
@@ -1974,7 +1973,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
if (sk->sk_state == TCP_LISTEN)
goto out;
- has_cmsg = tp->recvmsg_inq;
+ cmsg_flags = tp->recvmsg_inq ? 1 : 0;
timeo = sock_rcvtimeo(sk, nonblock);
/* Urgent data needs to be handled specially. */
@@ -2157,8 +2156,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
if (TCP_SKB_CB(skb)->has_rxtstamp) {
tcp_update_recv_tstamps(skb, &tss);
- has_tss = true;
- has_cmsg = true;
+ cmsg_flags |= 2;
}
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
goto found_fin_ok;
@@ -2183,10 +2181,10 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
release_sock(sk);
- if (has_cmsg) {
- if (has_tss)
+ if (cmsg_flags) {
+ if (cmsg_flags & 2)
tcp_recv_timestamp(msg, sk, &tss);
- if (tp->recvmsg_inq) {
+ if (cmsg_flags & 1) {
inq = tcp_inq_hint(sk);
put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq);
}
--
2.24.0.rc1.363.gb1bccd3e3d-goog
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