[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!
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