From: Arvind Sankar <nivedita@alum.mit.edu>
To: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
Rob Landley <rob@landley.net>,
Arvind Sankar <niveditas98@gmail.com>,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org,
initramfs@vger.kernel.org
Subject: Re: [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk
Date: Tue, 14 May 2019 21:00:00 -0400 [thread overview]
Message-ID: <20190515005959.GC88615@rani.riverdale.lan> (raw)
In-Reply-To: <ca622341-5ea2-895e-8b82-7181a709c104@huawei.com>
On Tue, May 14, 2019 at 07:44:42PM +0200, Roberto Sassu wrote:
> On 5/14/2019 5:57 PM, Arvind Sankar wrote:
> > On Tue, May 14, 2019 at 11:27:04AM -0400, Arvind Sankar wrote:
> >> It's also much easier to change/customize it for the end
> >> system's requirements rather than setting the process in stone by
> >> putting it inside the kernel.
> >
> > As an example, if you allow unverified external initramfs, it seems to
> > me that it can try to play games that wouldn't be prevented by the
> > in-kernel code: setup /dev in a weird way to try to trick /init, or more
> > easily, replace /init by /bin/sh so you get a shell prompt while only
> > the initramfs is loaded. It's easy to imagine that a system would want
> > to lock itself down to prevent abuses like this.
>
> Yes, these issues should be addressed. But the purpose of this patch set
> is simply to set xattrs. And existing protection mechanisms can be
> improved later when the basic functionality is there.
>
Yeah but it's much easier to enhance it when it lives in userspace and
can be tailored to a particular system's requirements. Eg a lot of the
issues will disappear if you don't have to allow for external initramfs
at all, so those systems can have a very simple embedded /init that
doesn't have to do much.
>
> > So you might already want an embedded initramfs that can be trusted and
> > that can't be overwritten by an external one even outside the
> > security.ima stuff.
>
> The same problems exist also the root filesystem. These should be solved
> regardless of the filesystem used, for remote attestation and for local
> enforcement.
>
> --
> HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
> Managing Director: Bo PENG, Jian LI, Yanli SHI
next prev parent reply other threads:[~2019-05-15 1:00 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-09 11:24 [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk Roberto Sassu
2019-05-09 11:24 ` [PATCH v2 1/3] fs: add ksys_lsetxattr() wrapper Roberto Sassu
2019-05-10 21:28 ` Jann Horn
2019-05-09 11:24 ` [PATCH v2 2/3] initramfs: set extended attributes Roberto Sassu
2019-05-09 11:24 ` [PATCH v2 3/3] initramfs: introduce do_readxattrs() Roberto Sassu
2019-05-10 21:33 ` Jann Horn
2019-05-13 13:03 ` Roberto Sassu
2019-05-09 18:34 ` [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk Rob Landley
2019-05-10 6:56 ` Roberto Sassu
2019-05-10 11:49 ` Mimi Zohar
2019-05-10 20:46 ` Rob Landley
2019-05-10 22:38 ` Mimi Zohar
2019-05-11 22:44 ` Andy Lutomirski
2019-05-12 4:04 ` Rob Landley
2019-05-12 4:12 ` Rob Landley
2019-05-12 9:17 ` Dominik Brodowski
2019-05-12 10:18 ` hpa
2019-05-12 15:31 ` Dominik Brodowski
2019-05-13 0:02 ` Mimi Zohar
2019-05-13 0:21 ` hpa
2019-05-13 0:23 ` hpa
2019-05-12 12:52 ` Mimi Zohar
2019-05-12 17:05 ` Rob Landley
2019-05-12 19:43 ` Arvind Sankar
2019-05-13 7:49 ` Roberto Sassu
2019-05-13 9:07 ` Rob Landley
2019-05-13 12:08 ` Mimi Zohar
2019-05-13 12:47 ` Roberto Sassu
2019-05-13 17:20 ` Arvind Sankar
2019-05-13 17:51 ` Arvind Sankar
2019-05-13 17:52 ` Arvind Sankar
2019-05-13 18:36 ` Mimi Zohar
2019-05-13 18:47 ` Arvind Sankar
2019-05-13 22:09 ` Mimi Zohar
2019-05-14 6:06 ` Rob Landley
2019-05-14 14:44 ` Arvind Sankar
2019-05-14 6:06 ` Rob Landley
2019-05-14 11:52 ` Roberto Sassu
2019-05-14 15:12 ` Rob Landley
2019-05-14 15:27 ` Arvind Sankar
2019-05-14 15:57 ` Arvind Sankar
2019-05-14 17:44 ` Roberto Sassu
2019-05-15 1:00 ` Arvind Sankar [this message]
2019-05-14 15:19 ` Andy Lutomirski
2019-05-14 16:33 ` Roberto Sassu
2019-05-14 16:58 ` Greg KH
2019-05-14 17:20 ` Roberto Sassu
2019-05-15 0:25 ` Arvind Sankar
2019-05-14 19:18 ` James Bottomley
2019-05-14 23:39 ` Rob Landley
2019-05-14 23:54 ` James Bottomley
2019-05-15 0:52 ` Arvind Sankar
2019-05-15 11:19 ` Roberto Sassu
2019-05-15 16:08 ` Arvind Sankar
2019-05-15 17:06 ` Roberto Sassu
2019-05-16 5:29 ` Arvind Sankar
2019-05-16 11:42 ` Roberto Sassu
2019-05-16 13:31 ` Mimi Zohar
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