From: Arvind Sankar <nivedita@alum.mit.edu>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: Arvind Sankar <niveditas98@gmail.com>,
Roberto Sassu <roberto.sassu@huawei.com>,
Rob Landley <rob@landley.net>,
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: Mon, 13 May 2019 14:47:45 -0400 [thread overview]
Message-ID: <20190513184744.GA12386@rani.riverdale.lan> (raw)
In-Reply-To: <1557772584.4969.62.camel@linux.ibm.com>
On Mon, May 13, 2019 at 02:36:24PM -0400, Mimi Zohar wrote:
>
> > > How does this work today then? Is it actually the case that initramfs
> > > just cannot be used on an IMA-enabled system, or it can but it leaves
> > > the initramfs unverified and we're trying to fix that? I had assumed the
> > > latter.
> > Oooh, it's done not by starting IMA appraisal later, but by loading a
> > default policy to ignore initramfs?
>
> Right, when rootfs is a tmpfs filesystem, it supports xattrs, allowing
> for finer grained policies to be defined. This patch set would allow
> a builtin IMA appraise policy to be defined which includes tmpfs.
>
> Mimi
>
Ok, but wouldn't my idea still work? Leave the default compiled-in
policy set to not appraise initramfs. The embedded /init sets all the
xattrs, changes the policy to appraise tmpfs, and then exec's the real
init? Then everything except the embedded /init and the file with the
xattrs will be appraised, and the embedded /init was verified as part of
the kernel image signature. The only additional kernel change needed
then is to add a config option to the kernel to disallow overwriting the
embedded initramfs (or at least the embedded /init).
next prev parent reply other threads:[~2019-05-13 18:47 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 [this message]
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
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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