linux-kernel - [syzbot] KCSAN: data-race in wg_packet_decrypt_worker / wg_packet_rx

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Date:   Tue, 08 Feb 2022 00:33:29 -0800
From:   syzbot <syzbot+d1de830e4ecdaac83d89@...kaller.appspotmail.com>
To:     Jason@...c4.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, wireguard@...ts.zx2c4.com
Subject: [syzbot] KCSAN: data-race in wg_packet_decrypt_worker /
 wg_packet_rx_poll (2)

Hello,

syzbot found the following issue on:

HEAD commit:    2ade8eef993c Merge tag 'ata-5.17-rc4' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=112ef758700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1dcc3374da7c1f7c
dashboard link: https://syzkaller.appspot.com/bug?extid=d1de830e4ecdaac83d89
compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1de830e4ecdaac83d89@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in wg_packet_decrypt_worker / wg_packet_rx_poll

write to 0xffff888127d03888 of 8 bytes by interrupt on cpu 1:
 counter_validate drivers/net/wireguard/receive.c:328 [inline]
 wg_packet_rx_poll+0x436/0x11f0 drivers/net/wireguard/receive.c:468
 __napi_poll+0x65/0x3f0 net/core/dev.c:6365
 napi_poll net/core/dev.c:6432 [inline]
 net_rx_action+0x29e/0x650 net/core/dev.c:6519
 __do_softirq+0x158/0x2de kernel/softirq.c:558
 do_softirq+0xb1/0xf0 kernel/softirq.c:459
 __local_bh_enable_ip+0x68/0x70 kernel/softirq.c:383
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x33/0x40 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:394 [inline]
 ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
 wg_packet_decrypt_worker+0x73c/0x780 drivers/net/wireguard/receive.c:506
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

read to 0xffff888127d03888 of 8 bytes by task 1912 on cpu 0:
 decrypt_packet drivers/net/wireguard/receive.c:259 [inline]
 wg_packet_decrypt_worker+0x23a/0x780 drivers/net/wireguard/receive.c:508
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000bb9 -> 0x0000000000000bba

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1912 Comm: kworker/0:3 Not tainted 5.17.0-rc3-syzkaller-00013-g2ade8eef993c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-crypt-wg1 wg_packet_decrypt_worker
==================================================================


---
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