linux-kernel - Re: [PATCH v2 0/3] fuse: Add support for mounts from pid/user namespaces

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Date:	Tue, 23 Sep 2014 18:07:35 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	fuse-devel <fuse-devel@...ts.sourceforge.net>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] fuse: Add support for mounts from pid/user namespaces

On Tue, Sep 2, 2014 at 5:44 PM, Seth Forshee <seth.forshee@...onical.com> wrote:
> Here's an updated set of patches for allowing fuse mounts from pid and
> user namespaces. I discussed some of the issues we debated with the last
> patch set (and a few others) with Eric at LinuxCon, and the updates here
> mainly reflect the outcome of those discussions.
>
> The stickiest issue in the v1 patches was the question of where to get
> the user and pid namespaces from that are used for translating ids for
> communication with userspace. Eric told me that for user namespaces at
> least we need to grab a namespace at open or mount time and use only
> that namespace to prevent certain types of attacks.

I'm not convinced.  Let us have the gory details, please.

Thanks,
Miklos
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