From: Breno Leitao <leitao@debian.org>
To: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: leit@meta.com,
netdev@vger.kernel.org (open list:NETWORKING [GENERAL]),
linux-kernel@vger.kernel.org (open list)
Subject: [PATCH net-next] netpoll: Fix race condition in netpoll_owner_active
Date: Mon, 29 Apr 2024 03:04:33 -0700 [thread overview]
Message-ID: <20240429100437.3487432-1-leitao@debian.org> (raw)
KCSAN detected a race condition in netpoll:
BUG: KCSAN: data-race in net_rx_action / netpoll_send_skb
write (marked) to 0xffff8881164168b0 of 4 bytes by interrupt on cpu 10:
net_rx_action (./include/linux/netpoll.h:90 net/core/dev.c:6712 net/core/dev.c:6822)
<snip>
read to 0xffff8881164168b0 of 4 bytes by task 1 on cpu 2:
netpoll_send_skb (net/core/netpoll.c:319 net/core/netpoll.c:345 net/core/netpoll.c:393)
netpoll_send_udp (net/core/netpoll.c:?)
<snip>
value changed: 0x0000000a -> 0xffffffff
This happens because netpoll_owner_active() needs to check if the
current CPU is the owner of the lock, touching napi->poll_owner
non atomically. The ->poll_owner field contains the current CPU holding
the lock.
Use an atomic read to check if the poll owner is the current CPU.
Signed-off-by: Breno Leitao <leitao@debian.org>
---
net/core/netpoll.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 543007f159f9..55bcacf67df3 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -316,7 +316,7 @@ static int netpoll_owner_active(struct net_device *dev)
struct napi_struct *napi;
list_for_each_entry_rcu(napi, &dev->napi_list, dev_list) {
- if (napi->poll_owner == smp_processor_id())
+ if (READ_ONCE(napi->poll_owner) == smp_processor_id())
return 1;
}
return 0;
--
2.43.0
next reply other threads:[~2024-04-29 10:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-29 10:04 Breno Leitao [this message]
2024-05-01 2:10 ` [PATCH net-next] netpoll: Fix race condition in netpoll_owner_active patchwork-bot+netdevbpf
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