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

[Mimi Zohar]

On Mon, 2018-01-15 at 08:27 -0800, Christoph Hellwig wrote:
> 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.

rootfs IS different than other filesystems, as other filesystems
uniquely identify the underlying filesystem type. Ârootfs can be a
ramfs or tmpfs filesystem. ÂOnly tmpfs supports xattrs.

Mimi