linux-kernel - Re: [PATCH v3 0/7] User namespace mount updates

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Date:	Tue, 17 Nov 2015 21:25:37 +0200
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-bcache@...r.kernel.org,
	device-mapper development <dm-devel@...hat.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LSM <linux-security-module@...r.kernel.org>,
	selinux@...ho.nsa.gov, Serge Hallyn <serge.hallyn@...onical.com>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	"Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH v3 0/7] User namespace mount updates

On Tue, Nov 17, 2015 at 9:21 PM, Seth Forshee
<seth.forshee@...onical.com> wrote:
>
> On Tue, Nov 17, 2015 at 08:12:31PM +0100, Richard Weinberger wrote:
> > On Tue, Nov 17, 2015 at 7:34 PM, Seth Forshee
> > <seth.forshee@...onical.com> wrote:
> > > On Tue, Nov 17, 2015 at 05:55:06PM +0000, Al Viro wrote:
> > >> On Tue, Nov 17, 2015 at 11:25:51AM -0600, Seth Forshee wrote:
> > >>
> > >> > Shortly after that I plan to follow with support for ext4. I've been
> > >> > fuzzing ext4 for a while now and it has held up well, and I'm currently
> > >> > working on hand-crafted attacks. Ted has commented privately (to others,
> > >> > not to me personally) that he will fix bugs for such attacks, though I
> > >> > haven't seen any public comments to that effect.
> > >>
> > >> _Static_ attacks, or change-image-under-mounted-fs attacks?
> > >
> > > Right now only static attacks, change-image-under-mounted-fs attacks
> > > will be next.
> >
> > Do we *really* need to enable unprivileged mounting of kernel filesystems?
> > What about just enabling fuse and implement ext4 and friends as fuse
> > filesystems?
> > Using the approaching Linux Kernel Libary[1] this is easy.
>
> I haven't looked at this project, but I'm guessing that programs must be
> written specifically to make use of it? I.e. you can't just use the
> mount syscall, and thus all existing software still doesn't work?
>

The projects includes a lklfuse program that uses fuse to mount a
fileystem image.
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