[RESEND,net,v2] wireguard: receive: annotate data-race around receiving_counter.counter
Commit Message
Syzkaller with KCSAN identified a data-race issue [1] when accessing
keypair->receiving_counter.counter.
This patch uses READ_ONCE() and WRITE_ONCE() annotations to fix the
problem.
[1]
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
...
Fixes: a9e90d9931f3 ("wireguard: noise: separate receive counter from send counter")
Reported-by: syzbot+d1de830e4ecdaac83d89@syzkaller.appspotmail.com
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
---
v2: add missing annotation in wg_packet_rx_poll() per Eric Duzamet's
<edumazet@google.com> helpful suggestion.
drivers/net/wireguard/receive.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
Comments
@@ -251,7 +251,7 @@ static bool decrypt_packet(struct sk_buff *skb, struct noise_keypair *keypair)
if (unlikely(!READ_ONCE(keypair->receiving.is_valid) ||
wg_birthdate_has_expired(keypair->receiving.birthdate, REJECT_AFTER_TIME) ||
- keypair->receiving_counter.counter >= REJECT_AFTER_MESSAGES)) {
+ READ_ONCE(keypair->receiving_counter.counter) >= REJECT_AFTER_MESSAGES)) {
WRITE_ONCE(keypair->receiving.is_valid, false);
return false;
}
@@ -318,7 +318,7 @@ static bool counter_validate(struct noise_replay_counter *counter, u64 their_cou
for (i = 1; i <= top; ++i)
counter->backtrack[(i + index_current) &
((COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1)] = 0;
- counter->counter = their_counter;
+ WRITE_ONCE(counter->counter, their_counter);
}
index &= (COUNTER_BITS_TOTAL / BITS_PER_LONG) - 1;
@@ -463,7 +463,7 @@ int wg_packet_rx_poll(struct napi_struct *napi, int budget)
net_dbg_ratelimited("%s: Packet has invalid nonce %llu (max %llu)\n",
peer->device->dev->name,
PACKET_CB(skb)->nonce,
- keypair->receiving_counter.counter);
+ READ_ONCE(keypair->receiving_counter.counter));
goto next;
}