Re: [PATCH 1/2] USB: core: add a way to revoke access to open USB devices

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Aug 09, 2022 at 11:42:59AM +0200, Bastien Nocera wrote:
> There is a need for userspace applications to open USB devices directly,
> for all the USB devices without a kernel-level class driver[1], and
> implemented in user-space.
> 
> As not all devices are built equal, we want to be able to revoke
> access to those devices whether it's because the user isn't at the
> console anymore, or because the web browser, or sandbox doesn't want
> to allow access to that device.
> 
> This commit implements the internal API used to revoke access to USB
> devices, given either bus and device numbers, or/and a user's
> effective UID.
> 
> Signed-off-by: Bastien Nocera <hadess@hadess.net>
> 
> [1]:
> Non exhaustive list of devices and device types that need raw USB access:
> - all manners of single-board computers and programmable chips and
> devices (avrdude, STLink, sunxi bootloader, flashrom, etc.)
> - 3D printers
> - scanners
> - LCD "displays"
> - user-space webcam and still cameras
> - game controllers
> - video/audio capture devices
> - sensors
> - software-defined radios
> - DJ/music equipment
> - protocol analysers
> - Rio 500 music player

We can't take "footnotes" after a signed-off-by line, you know this :(