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authorEric Dumazet <edumazet@google.com>2021-06-29 17:12:45 +0300
committerDavid S. Miller <davem@davemloft.net>2021-07-01 21:23:50 +0300
commit0dbffbb5335a1e3aa6855e4ee317e25e669dd302 (patch)
tree2f7c7aa9e605bfbb4f9bbb6b8e6ce84eb7e5abd0
parent42ca63f980842918560b25f0244307fd83b4777c (diff)
downloadlinux-0dbffbb5335a1e3aa6855e4ee317e25e669dd302.tar.xz
net: annotate data race around sk_ll_usec
sk_ll_usec is read locklessly from sk_can_busy_loop() while another thread can change its value in sock_setsockopt() This is correct but needs annotations. BUG: KCSAN: data-race in __skb_try_recv_datagram / sock_setsockopt write to 0xffff88814eb5f904 of 4 bytes by task 14011 on cpu 0: sock_setsockopt+0x1287/0x2090 net/core/sock.c:1175 __sys_setsockopt+0x14f/0x200 net/socket.c:2100 __do_sys_setsockopt net/socket.c:2115 [inline] __se_sys_setsockopt net/socket.c:2112 [inline] __x64_sys_setsockopt+0x62/0x70 net/socket.c:2112 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88814eb5f904 of 4 bytes by task 14001 on cpu 1: sk_can_busy_loop include/net/busy_poll.h:41 [inline] __skb_try_recv_datagram+0x14f/0x320 net/core/datagram.c:273 unix_dgram_recvmsg+0x14c/0x870 net/unix/af_unix.c:2101 unix_seqpacket_recvmsg+0x5a/0x70 net/unix/af_unix.c:2067 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:244 ___sys_recvmsg net/socket.c:2598 [inline] do_recvmmsg+0x35c/0x9f0 net/socket.c:2692 __sys_recvmmsg net/socket.c:2771 [inline] __do_sys_recvmmsg net/socket.c:2794 [inline] __se_sys_recvmmsg net/socket.c:2787 [inline] __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2787 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000 -> 0x00000101 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14001 Comm: syz-executor.3 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/busy_poll.h2
-rw-r--r--net/core/sock.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index 73af4a64a599..40296ed976a9 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -38,7 +38,7 @@ static inline bool net_busy_loop_on(void)
static inline bool sk_can_busy_loop(const struct sock *sk)
{
- return sk->sk_ll_usec && !signal_pending(current);
+ return READ_ONCE(sk->sk_ll_usec) && !signal_pending(current);
}
bool sk_busy_loop_end(void *p, unsigned long start_time);
diff --git a/net/core/sock.c b/net/core/sock.c
index ba1c0f75cd45..dd9599656c40 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1201,7 +1201,7 @@ set_sndbuf:
if (val < 0)
ret = -EINVAL;
else
- sk->sk_ll_usec = val;
+ WRITE_ONCE(sk->sk_ll_usec, val);
}
break;
case SO_PREFER_BUSY_POLL: