Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> writes: >> +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 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
