netdev - Re: [PATCH net] macvlan: add cond_resched() during multicast processing

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Message-Id: <20200309.180252.1828445690226985016.davem@davemloft.net>
Date:   Mon, 09 Mar 2020 18:02:52 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     maheshb@...gle.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, mahesh@...dewar.net
Subject: Re: [PATCH net] macvlan: add cond_resched() during multicast
 processing

From: Mahesh Bandewar <maheshb@...gle.com>
Date: Mon,  9 Mar 2020 15:57:07 -0700

> The Rx bound multicast packets are deferred to a workqueue and
> macvlan can also suffer from the same attack that was discovered
> by Syzbot for IPvlan. This solution is not as effective as in
> IPvlan. IPvlan defers all (Tx and Rx) multicast packet processing
> to a workqueue while macvlan does this way only for the Rx. This
> fix should address the Rx codition to certain extent.
> 
> Tx is still suseptible. Tx multicast processing happens when
> .ndo_start_xmit is called, hence we cannot add cond_resched().
> However, it's not that severe since the user which is generating
>  / flooding will be affected the most.
> 
> Fixes: 412ca1550cbe ("macvlan: Move broadcasts into a work queue")
> Signed-off-by: Mahesh Bandewar <maheshb@...gle.com>

Applied and queued up for -stable.