Make USB passthrough devices user-writable by default

[andrewdavidwong]

On 2016-11-28 03:29, Jean-Philippe Ouellet wrote:

If you use qvm-usb to assign a particular USB device to a particular
VM, it's probably because you wanted to actually use that device! (or
more likely some program which interfaces with that device)

Currently, such programs will likely fail due to the user account
not having write access to the device node.

Under Qubes' threat model, we assume there is no meaningful privilege
boundary between user and root1, so would it make sense to just make
all passed-through USB devs world-writable (or at least user-writable)
to enable software using them to "Just Work" by default?

Right now things only work if some application provides udev rules
changing ownership/permissions, or if a user observes things failing
and happens to know to go chmod stuff in /dev.