Am Dienstag, 7. Juli 2009 21:29:16 schrieb Alan Stern: > On Tue, 7 Jul 2009, Oliver Neukum wrote: > > Am Dienstag, 7. Juli 2009 16:39:03 schrieb Alan Stern: > > > It does seem unnecessary to keep the minor number tied up merely > > > because the device file is open. Maybe there's some deeper reason for > > > this I'm not aware of. In any case, below is an experimental patch you > > > can try out. It should cause usb-serial to release the minor number as > > > soon as the device is unplugged. (I haven't tried it myself, so you'll > > > be the first!) > > > > This endangers system security. Somebody might have permissions to > > use the old device, defined by a major:minor pair, who must not be let > > use the new device. > > I don't understand. Permissions aren't associated with major:minor > paris; they are associated with device nodes in the filesystem. But the node is merely a scheme to link a major:minor pair to a name and permissions. > So yes, it's possible that an old device node allowing global access > might not be replaced sufficiently quickly by a new node having more > restrictive permissions. Then a user could open the old node and > thereby gain access to the new device. But that's unrelated to this > patch. Does it make it likely that the minor number will be reused next time? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
