linux-kernel - Re: [PATCH v2 00/10] userns: sysctl limits for namespaces

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Message-ID: <6be70177-a81d-7ed8-d2c9-a596d4d6a165@gmail.com>
Date:	Tue, 26 Jul 2016 12:30:10 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.linux-foundation.org>
Cc:	mtk.manpages@...il.com, Andy Lutomirski <luto@...capital.net>,
	Jann Horn <jann@...jh.net>, Kees Cook <keescook@...omium.org>,
	Nikolay Borisov <kernel@...p.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2 00/10] userns: sysctl limits for namespaces

Hello Eric,

I realized I had a question after the last mail.

On 07/21/2016 06:39 PM, Eric W. Biederman wrote:
>
> This patchset addresses two use cases:
> - Implement a sane upper bound on the number of namespaces.
> - Provide a way for sandboxes to limit the attack surface from
>   namespaces.

Can you say more about the second point? What exactly is the
problem that is being addressed, and how does the patch series
address it? (It would be good to have those details in the
revised commit message...)

Cheers,

Michael