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

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Message-ID: <20150722223904.20ef9011@uryu.home.lan>
Date:	Wed, 22 Jul 2015 22:39:04 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, davem@...emloft.net
Subject: Re: [RFC Patch net-next] inet: introduce a sysctl
 ip_local_ports_strict_use

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.

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