CVE-2024-26861

In the Linux kernel, the following vulnerability has been resolved:

wireguard: receive: annotate data-race around receiving_counter.counter

Syzkaller with KCSAN identified a data-race issue when accessing

keypair->receiving_counter.counter. Use READ_ONCE() and WRITE_ONCE()

annotations to mark the data race as intentional.

BUG: KCSAN: data-race in wg_packet_decrypt_worker / wg_packet_rx_poll

write to 0xffff888107765888 of 8 bytes by interrupt on cpu 0:

counter_validate drivers/net/wireguard/receive.c:321 [inline]

wg_packet_rx_poll+0x3ac/0xf00 drivers/net/wireguard/receive.c:461

__napi_poll+0x60/0x3b0 net/core/dev.c:6536

napi_poll net/core/dev.c:6605 [inline]

net_rx_action+0x32b/0x750 net/core/dev.c:6738

__do_softirq+0xc4/0x279 kernel/softirq.c:553

do_softirq+0x5e/0x90 kernel/softirq.c:454

__local_bh_enable_ip+0x64/0x70 kernel/softirq.c:381

__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]

_raw_spin_unlock_bh+0x36/0x40 kernel/locking/spinlock.c:210

spin_unlock_bh include/linux/spinlock.h:396 [inline]

ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]

wg_packet_decrypt_worker+0x6c5/0x700 drivers/net/wireguard/receive.c:499

process_one_work kernel/workqueue.c:2633 [inline]

...

read to 0xffff888107765888 of 8 bytes by task 3196 on cpu 1:

decrypt_packet drivers/net/wireguard/receive.c:252 [inline]

wg_packet_decrypt_worker+0x220/0x700 drivers/net/wireguard/receive.c:501

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

...