linux-kernel - Re: [PATCH RFC] allow some kernel filesystems to be mounted in a user namespace

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Message-ID: <20130716193826.GP4165@ZenIV.linux.org.uk>
Date:	Tue, 16 Jul 2013 20:38:26 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Serge Hallyn <serge.hallyn@...ntu.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] allow some kernel filesystems to be mounted in a
 user namespace

On Tue, Jul 16, 2013 at 02:29:20PM -0500, Serge Hallyn wrote:
> All the files will be owned by host root, so there's no security
> concern in allowing this.

Files owned by root != very bad things can't be done by non-root.
Especially for debugfs, which is very much a "don't even think about
mounting that on a production box" thing...
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