netdev - Re: [PATCH net] net: bridge: use DEV_STATS

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Message-ID: <cf8b9040-46dd-21af-b92f-78af1f1536c7@blackwall.org>
Date: Mon, 18 Sep 2023 12:29:52 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
 syzbot <syzkaller@...glegroups.com>, Roopa Prabhu <roopa@...dia.com>,
 bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net] net: bridge: use DEV_STATS_INC()

On 9/18/23 12:13, Eric Dumazet wrote:
> syzbot/KCSAN reported data-races in br_handle_frame_finish() [1]
> This function can run from multiple cpus without mutual exclusion.
> 
> Adopt SMP safe DEV_STATS_INC() to update dev->stats fields.
> 
> Handles updates to dev->stats.tx_dropped while we are at it.
> 
> [1]
> BUG: KCSAN: data-race in br_handle_frame_finish / br_handle_frame_finish
> 
> read-write to 0xffff8881374b2178 of 8 bytes by interrupt on cpu 1:
> br_handle_frame_finish+0xd4f/0xef0 net/bridge/br_input.c:189
> br_nf_hook_thresh+0x1ed/0x220
> br_nf_pre_routing_finish_ipv6+0x50f/0x540
> NF_HOOK include/linux/netfilter.h:304 [inline]
> br_nf_pre_routing_ipv6+0x1e3/0x2a0 net/bridge/br_netfilter_ipv6.c:178
> br_nf_pre_routing+0x526/0xba0 net/bridge/br_netfilter_hooks.c:508
> nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
> nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
> br_handle_frame+0x4c9/0x940 net/bridge/br_input.c:417
> __netif_receive_skb_core+0xa8a/0x21e0 net/core/dev.c:5417
> __netif_receive_skb_one_core net/core/dev.c:5521 [inline]
> __netif_receive_skb+0x57/0x1b0 net/core/dev.c:5637
> process_backlog+0x21f/0x380 net/core/dev.c:5965
> __napi_poll+0x60/0x3b0 net/core/dev.c:6527
> napi_poll net/core/dev.c:6594 [inline]
> net_rx_action+0x32b/0x750 net/core/dev.c:6727
> __do_softirq+0xc1/0x265 kernel/softirq.c:553
> run_ksoftirqd+0x17/0x20 kernel/softirq.c:921
> smpboot_thread_fn+0x30a/0x4a0 kernel/smpboot.c:164
> 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:304
> 
> read-write to 0xffff8881374b2178 of 8 bytes by interrupt on cpu 0:
> br_handle_frame_finish+0xd4f/0xef0 net/bridge/br_input.c:189
> br_nf_hook_thresh+0x1ed/0x220
> br_nf_pre_routing_finish_ipv6+0x50f/0x540
> NF_HOOK include/linux/netfilter.h:304 [inline]
> br_nf_pre_routing_ipv6+0x1e3/0x2a0 net/bridge/br_netfilter_ipv6.c:178
> br_nf_pre_routing+0x526/0xba0 net/bridge/br_netfilter_hooks.c:508
> nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
> nf_hook_bridge_pre net/bridge/br_input.c:272 [inline]
> br_handle_frame+0x4c9/0x940 net/bridge/br_input.c:417
> __netif_receive_skb_core+0xa8a/0x21e0 net/core/dev.c:5417
> __netif_receive_skb_one_core net/core/dev.c:5521 [inline]
> __netif_receive_skb+0x57/0x1b0 net/core/dev.c:5637
> process_backlog+0x21f/0x380 net/core/dev.c:5965
> __napi_poll+0x60/0x3b0 net/core/dev.c:6527
> napi_poll net/core/dev.c:6594 [inline]
> net_rx_action+0x32b/0x750 net/core/dev.c:6727
> __do_softirq+0xc1/0x265 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]
> batadv_tt_local_purge+0x1a8/0x1f0 net/batman-adv/translation-table.c:1356
> batadv_tt_purge+0x2b/0x630 net/batman-adv/translation-table.c:3560
> process_one_work kernel/workqueue.c:2630 [inline]
> process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
> worker_thread+0x525/0x730 kernel/workqueue.c:2784
> 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:304
> 
> value changed: 0x00000000000d7190 -> 0x00000000000d7191
> 
> Reported by Kernel Concurrency Sanitizer on:
> CPU: 0 PID: 14848 Comm: kworker/u4:11 Not tainted 6.6.0-rc1-syzkaller-00236-gad8a69f361b9 #0
> 
> Fixes: 1c29fc4989bc ("[BRIDGE]: keep track of received multicast packets")
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Roopa Prabhu <roopa@...dia.com>
> Cc: Nikolay Aleksandrov <razor@...ckwall.org>
> Cc: bridge@...ts.linux-foundation.org
> ---
>   net/bridge/br_forward.c | 4 ++--
>   net/bridge/br_input.c   | 4 ++--
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 

Thanks,
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>