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

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Message-ID: <CAFLxGvx1UqJOhM3wqAGqT+TrkapeP1zkmg0a1K=DjySePx4mEA@mail.gmail.com>
Date:	Tue, 17 Nov 2015 20:12:31 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Seth Forshee <seth.forshee@...onical.com>
Cc:	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>,
	Octavian Purdila <octavian.purdila@...el.com>
Subject: Re: [PATCH v3 0/7] User namespace mount updates

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.

[1] https://lkml.org/lkml/2015/11/3/706
-- 
Thanks,
//richard
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