USB reset fails when using a LimeSDR Mini on FreeBSD

[Jan Behrens]

On Thu, 2 Jul 2020 10:41:42 +0200
Hans Petter Selasky <hps at selasky.org> wrote:

> On 2020-07-02 10:35, Jan Behrens wrote:
> > Thus Linux definitely behaves differently here. My question is: Can
> > and/or should FreeBSD be fixed to allow libusb_reset_device() as a user
> > or should a driver library be fixed to not use that call.
> 
> This is an architectural problem. USB devices may have interfaces with 
> independent drivers attached. If one USB interface driver is running as 
> root and another USB interface driver is running as non-root, it doesn't 
> make sense that the non-root device driver should be able to affect the 
> root-one.

But wouldn't both drivers require access to the entries in /dev ?
Thus not every user could mess with any USB device, or do I get it
wrong?

> Your LimeSDR device appears to be very simple, having just one 
> USB device driver attaching to it. Just imagine some web-page trying to 
> reset your USB device, just because it can! Yes, USB is also exposed to 
> firefox nowadays :-)

My webbrowser runs as different user than the programs that get access
to emit radio emissions on my behalf.

> 
> What we could do is to add a sysctl which controls the behaviour for 
> this specific case. Would that be of any use to you?

You mean allowing users to reset USB devices? Only those which the
users have access to on the /dev filesystem? Or all devices?

> 
> --HPS
> 

Regards,
Jan