Re: [PATCH 1/3] implement uid and gid mount options for ext2

Alan Cox [off-list ref] writes:

quoted

+uid=n[:m]			Make all files appear to belong to uid n.
+				Useful for e.g. removable media with fstab
+				options 'user,uid=useruid'. The optional second
+				uid m is actually written to the file system.

So what happens if I insert a USB key containing a device node to the
hard disk ? Why is this functionality useful in the current form ?

(ie I think you need an actual rational security model first)

Also why is this at the per fs level duplicating stuff each time rather
than at the vfs level - this seems to be vfs level functionality.

Even more fun there is essentially a generic implementation in the user
namespaces.  What needs to be implemented to support this is support for
mounting in a non-default user namespace, and then all of the mapping
functionality is generic.  Which I presume will imply MS_NODEV.

Eric