linux-kernel - Re: [PATCH] ima: define new policy condition based on the filesystem name

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Message-ID: <20180115162726.GB15686@infradead.org>
Date:   Mon, 15 Jan 2018 08:27:26 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     linux-integrity <linux-integrity@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Dongsu Park <dongsu@...volk.io>,
        Alban Crequy <alban@...volk.io>,
        Christoph Hellwig <hch@...radead.org>,
        Seth Forshee <seth.forshee@...onical.com>
Subject: Re: [PATCH] ima: define new policy condition based on the filesystem
 name

On Mon, Jan 15, 2018 at 11:20:36AM -0500, Mimi Zohar wrote:
> Some filesystems do not export the filesystem's magic number, as it is
> considered internal, private data.  In other cases, the policy rule
> needs to identify a specifically mounted filesystem (eg. rootfs).

No, it doesn't.  Policies based on a file system type are complete and
utterly bogus.   rootfs should not be treated any different from other
file systems.