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

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Message-ID: <20180115171914.GB28088@infradead.org>
Date:   Mon, 15 Jan 2018 09:19:14 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        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>,
        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 11:40:07AM -0500, Mimi Zohar wrote:
> rootfs IS different than other filesystems, as other filesystems
> uniquely identify the underlying filesystem type.  rootfs can be a
> ramfs or tmpfs filesystem.  Only tmpfs supports xattrs.

Tons of filesystems only have xattrs optionally.  Check for goddamn
xattrs if that is the requirement and not a name that has absolutely
zero meaning for functionality.  That is the whole point!