netdev - Re: [RFC Patch net-next] inet: introduce a sysctl ip_local_ports_strict

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Message-ID: <CAM_iQpVP8jMymy6rcQj0TKbWKKJBH6L7G=AzU8opJrWqGvBtNg@mail.gmail.com>
Date:	Fri, 24 Jul 2015 13:53:36 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC Patch net-next] inet: introduce a sysctl ip_local_ports_strict_use

On Wed, Jul 22, 2015 at 10:39 PM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> On Wed, 22 Jul 2015 17:07:37 -0700
> Cong Wang <xiyou.wangcong@...il.com> wrote:
>
>> For a real example, named randomly selects some port to bind() for
>> security concern. (It doesn't use bind(0) to let kernel to select port
>> because it is not random enough, kernel usually just picks the next
>> available.) When running named on a Mesos controlled host, named would
>> silently fail when it binds a port assigned to a Mesos container.
>
> I think named is trying to workaround security issues that were fixed
> 5 years ago in Linux. The kernel does not just pick the next available
> in current code.
>

Good to know that. I will rephrase the changelog.

Thanks.
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