On Mon, 12 Aug 2024, Peter Hutterer wrote: > There is a need for userspace applications to open HID devices directly. > Use-cases include configuration of gaming mice or direct access to > joystick devices. The latter is currently handled by the uaccess tag in > systemd, other devices include more custom/local configurations or just > sudo. > > A better approach is what we already have for evdev devices: give the > application a file descriptor and revoke it when it may no longer access > that device. > > This patch is the hidraw equivalent to the EVIOCREVOKE ioctl, see > commit c7dc65737c9a607d3e6f8478659876074ad129b8 for full details. > > An MR for systemd-logind has been filed here: > https://github.com/systemd/systemd/pull/33970 > > hidraw_is_revoked() and hidraw_open_errno() are both defined as weak > functions to allow for a BPF program to deny access to a /dev/hidraw > device. The function returns 0 on success or a negative errno > otherwise that is returned to the caller. > > As a use-case example, a gamepad-managing process could attach a BPF > program that defaults to -EACCESS for all hidraw devices except those > with ID_INPUT_JOYSTICK set by udev. > > Signed-off-by: Peter Hutterer <peter.hutterer@xxxxxxxxx> Thanks Peter. Now queued in hid.git#for-6.12/hidraw. -- Jiri Kosina SUSE Labs
