mbox series

[net,0/2] net: bridge: mcast: add and enforce query interval minimum

Message ID 20211227172116.320768-1-nikolay@nvidia.com (mailing list archive)
Headers show
Series net: bridge: mcast: add and enforce query interval minimum | expand

Message

Nikolay Aleksandrov Dec. 27, 2021, 5:21 p.m. UTC 
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(-)

Comments

patchwork-bot+netdevbpf@kernel.org Dec. 29, 2021, 10:20 p.m. UTC | #1 
Hello:

This series was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 27 Dec 2021 19:21:14 +0200 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [net,1/2] net: bridge: mcast: add and enforce query interval minimum
    https://git.kernel.org/netdev/net/c/99b40610956a
  - [net,2/2] net: bridge: mcast: add and enforce startup query interval minimum
    https://git.kernel.org/netdev/net/c/f83a112bd91a

You are awesome, thank you!