linux-kernel - Re: [PATCH 1/5] fs: Verify access of user towards block device file when mounting

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Message-ID: <20151005142621.GB21639@ubuntu-hedt>
Date:	Mon, 5 Oct 2015 09:26:21 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Jan Kara <jack@...e.cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Mike Snitzer <snitzer@...hat.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
	Neil Brown <neilb@...e.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andy Lutomirski <luto@...capital.net>,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-bcache@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH 1/5] fs: Verify access of user towards block device file
 when mounting

On Fri, Oct 02, 2015 at 01:07:00AM +0200, Jan Kara wrote:
> On Thu 01-10-15 10:55:50, Eric W. Biederman wrote:
> > The goal if possible is to run things like docker without needed to be
> > root or even more fun to run docker in a container, and in general
> > enable nested containers.
> 
> Frankly at the filesystem side we are rather far from being able to safely
> mount untrusted device and I don't think we'll ever be robust enough to
> tolerate e.g. user changing the disk while fs is using it. So would this be
> FUSE-only thing or is someone still hoping that general purpose filesystems
> will be robust enough in future?

FUSE will almost certainly be first. I've also been working with ext4,
and I would like to see that eventually supported to some degree.

Seth
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