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linux/drivers/net/wireguard
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Jason A. Donenfeld 381a7d453f wireguard: send: annotate intentional data race in checking empty queue 
KCSAN reports a race in wg_packet_send_keepalive, which is intentional:

    BUG: KCSAN: data-race in wg_packet_send_keepalive / wg_packet_send_staged_packets

    write to 0xffff88814cd91280 of 8 bytes by task 3194 on cpu 0:
     __skb_queue_head_init include/linux/skbuff.h:2162 [inline]
     skb_queue_splice_init include/linux/skbuff.h:2248 [inline]
     wg_packet_send_staged_packets+0xe5/0xad0 drivers/net/wireguard/send.c:351
     wg_xmit+0x5b8/0x660 drivers/net/wireguard/device.c:218
     __netdev_start_xmit include/linux/netdevice.h:4940 [inline]
     netdev_start_xmit include/linux/netdevice.h:4954 [inline]
     xmit_one net/core/dev.c:3548 [inline]
     dev_hard_start_xmit+0x11b/0x3f0 net/core/dev.c:3564
     __dev_queue_xmit+0xeff/0x1d80 net/core/dev.c:4349
     dev_queue_xmit include/linux/netdevice.h:3134 [inline]
     neigh_connected_output+0x231/0x2a0 net/core/neighbour.c:1592
     neigh_output include/net/neighbour.h:542 [inline]
     ip6_finish_output2+0xa66/0xce0 net/ipv6/ip6_output.c:137
     ip6_finish_output+0x1a5/0x490 net/ipv6/ip6_output.c:222
     NF_HOOK_COND include/linux/netfilter.h:303 [inline]
     ip6_output+0xeb/0x220 net/ipv6/ip6_output.c:243
     dst_output include/net/dst.h:451 [inline]
     NF_HOOK include/linux/netfilter.h:314 [inline]
     ndisc_send_skb+0x4a2/0x670 net/ipv6/ndisc.c:509
     ndisc_send_rs+0x3ab/0x3e0 net/ipv6/ndisc.c:719
     addrconf_dad_completed+0x640/0x8e0 net/ipv6/addrconf.c:4295
     addrconf_dad_work+0x891/0xbc0
     process_one_work kernel/workqueue.c:2633 [inline]
     process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
     worker_thread+0x525/0x730 kernel/workqueue.c:2787
     kthread+0x1d7/0x210 kernel/kthread.c:388
     ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
     ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

    read to 0xffff88814cd91280 of 8 bytes by task 3202 on cpu 1:
     skb_queue_empty include/linux/skbuff.h:1798 [inline]
     wg_packet_send_keepalive+0x20/0x100 drivers/net/wireguard/send.c:225
     wg_receive_handshake_packet drivers/net/wireguard/receive.c:186 [inline]
     wg_packet_handshake_receive_worker+0x445/0x5e0 drivers/net/wireguard/receive.c:213
     process_one_work kernel/workqueue.c:2633 [inline]
     process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
     worker_thread+0x525/0x730 kernel/workqueue.c:2787
     kthread+0x1d7/0x210 kernel/kthread.c:388
     ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
     ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

    value changed: 0xffff888148fef200 -> 0xffff88814cd91280

Mark this race as intentional by using the skb_queue_empty_lockless()
function rather than skb_queue_empty(), which uses READ_ONCE()
internally to annotate the race.

Cc: stable@vger.kernel.org
Fixes: e7096c131e ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Link: https://patch.msgid.link/20240704154517.1572127-5-Jason@zx2c4.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-07-05 17:21:10 -07:00
..
selftest wireguard: allowedips: expand maximum node depth 2023-08-07 12:26:57 -07:00
allowedips.c wireguard: allowedips: avoid unaligned 64-bit memory accesses 2024-07-05 17:21:10 -07:00
allowedips.h wireguard: allowedips: free empty intermediate nodes when removing single node 2021-06-04 14:25:14 -07:00
cookie.c wireguard: do not include crypto/algapi.h 2023-09-15 18:29:44 +08:00
cookie.h
device.c wireguard: device: remove generic .ndo_get_stats64 2024-03-19 11:22:49 +01:00
device.h wireguard: receive: use ring buffer for incoming handshakes 2021-11-29 19:50:50 -08:00
main.c genetlink: remove linux/genetlink.h 2024-04-01 21:44:34 -07:00
Makefile
messages.h
netlink.c wireguard: netlink: access device through ctx instead of peer 2024-03-19 11:22:50 +01:00
netlink.h
noise.c wireguard: do not include crypto/algapi.h 2023-09-15 18:29:44 +08:00
noise.h
peer.c net: drop the weight argument from netif_napi_add 2022-09-28 18:57:14 -07:00
peer.h wireguard: peer: allocate in kmem_cache 2021-06-04 14:25:14 -07:00
peerlookup.c
peerlookup.h
queueing.c wireguard: queueing: use saner cpu selection wrapping 2023-07-03 09:17:52 +01:00
queueing.h wireguard: queueing: annotate intentional data race in cpu round robin 2024-07-05 17:21:10 -07:00
ratelimiter.c wireguard: ratelimiter: use kvcalloc() instead of kvzalloc() 2021-11-29 19:50:50 -08:00
ratelimiter.h
receive.c wireguard: receive: annotate data-race around receiving_counter.counter 2024-03-19 11:22:49 +01:00
send.c wireguard: send: annotate intentional data race in checking empty queue 2024-07-05 17:21:10 -07:00
socket.c wireguard: socket: ignore v6 endpoints when ipv6 is disabled 2022-03-30 19:14:09 -07:00
socket.h
timers.c wireguard: timers: move to using timer_delete_sync 2023-07-03 09:17:52 +01:00
timers.h
version.h