lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Mon, 9 Mar 2020 18:09:18 -0700
From:   Eric Dumazet <>
To:     Mahesh Bandewar <>,
        David Miller <>,
        Netdev <>
Cc:     Eric Dumazet <>,
        Mahesh Bandewar <>
Subject: Re: [PATCH net] macvlan: add cond_resched() during multicast

On 3/9/20 3:57 PM, Mahesh Bandewar wrote:
> 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.

susceptible ? Not sure what you want to say here.

 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 <>

Reviewed-by: Eric Dumazet <>

Powered by blists - more mailing lists