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] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 20 May 2020 19:24:17 +0200
From:   Christian Brauner <>
To:     David Ahern <>
Cc:     "David S. Miller" <>,
        Alexey Kuznetsov <>,
        Hideaki YOSHIFUJI <>,
        Jakub Kicinski <>,,
Subject: Re: [PATCH net-next] ipv6/route: inherit max_sizes from current netns

On Wed, May 20, 2020 at 10:54:21AM -0600, David Ahern wrote:
> On 5/20/20 8:58 AM, Christian Brauner wrote:
> > During NorthSec (cf. [1]) a very large number of unprivileged
> > containers and nested containers are run during the competition to
> > provide a safe environment for the various teams during the event. Every
> > year a range of feature requests or bug reports come out of this and
> > this year's no different.
> > One of the containers was running a simple VPN server. There were about
> > 1.5k users connected to this VPN over ipv6 and the container was setup
> > with about 100 custom routing tables when it hit the max_sizes routing
> > limit. After this no new connections could be established anymore,
> > pinging didn't work anymore; you get the idea.
> > 
> should have been addressed by:
> commit d8882935fcae28bceb5f6f56f09cded8d36d85e6
> Author: Eric Dumazet <>
> Date:   Fri May 8 07:34:14 2020 -0700
>     ipv6: use DST_NOCOUNT in ip6_rt_pcpu_alloc()
>     We currently have to adjust ipv6 route gc_thresh/max_size depending
>     on number of cpus on a server, this makes very little sense.
> Did your tests include this patch?

No, it's also pretty hard to trigger. The conference was pretty good for
I tested on top of rc6. I'm probably missing the big picture here, could
you briefy explain how this commit fixes the problem we ran into?


Powered by blists - more mailing lists