linux-kernel - Re: [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk

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Date:   Mon, 13 May 2019 14:36:24 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Arvind Sankar <niveditas98@...il.com>
Cc:     Roberto Sassu <roberto.sassu@...wei.com>,
        Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-integrity@...r.kernel.org, initramfs@...r.kernel.org
Subject: Re: [PATCH v2 0/3] initramfs: add support for xattrs in the initial
 ram disk


> > 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