netdev - [PATCH net 0/2] net: bridge: mcast: add and enforce query interval minimum

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Date:   Mon, 27 Dec 2021 19:21:14 +0200
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     <netdev@...r.kernel.org>
CC:     <eric.dumazet@...il.com>, <stable@...r.kernel.org>,
        <herbert@...dor.apana.org.au>, <roopa@...dia.com>,
        <davem@...emloft.net>, <bridge@...ts.linux-foundation.org>,
        <kuba@...nel.org>, Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [PATCH net 0/2] net: bridge: mcast: add and enforce query interval minimum

Hi,
This set adds and enforces 1 second minimum value for bridge multicast
query and startup query intervals in order to avoid rearming the timers
too often which could lock and crash the host. I doubt anyone is using
such low values or anything lower than 1 second, so it seems like a good
minimum. In order to be compatible if the value is lower then it is
overwritten and a log message is emitted, since we can't return an error
at this point.

Eric, I looked for the syzbot reports in its dashboard but couldn't find
them so I've added you as the reporter. If you point me to the reports
I can respin to give syzbot the credit.

I've prepared a global bridge igmp rate limiting patch but wasn't
sure if it's ok for -net. It adds a static limit of 32k packets per
second, I plan to send it for net-next with added drop counters for
each bridge so it can be easily debugged.

Original report can be seen at:
https://lore.kernel.org/netdev/e8b9ce41-57b9-b6e2-a46a-ff9c791cf0ba@gmail.com/

Thanks,
 Nik

Nikolay Aleksandrov (2):
  net: bridge: mcast: add and enforce query interval minimum
  net: bridge: mcast: add and enforce startup query interval minimum

 net/bridge/br_multicast.c    | 32 ++++++++++++++++++++++++++++++++
 net/bridge/br_netlink.c      |  4 ++--
 net/bridge/br_private.h      |  6 ++++++
 net/bridge/br_sysfs_br.c     |  4 ++--
 net/bridge/br_vlan_options.c |  4 ++--
 5 files changed, 44 insertions(+), 6 deletions(-)

-- 
2.33.1