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Wed, 21 Aug 2024 02:59:45 -0400 (EDT) Date: Wed, 21 Aug 2024 16:59:36 +1000 From: Peter Hutterer To: Jiri Kosina Cc: Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] HID: hidraw - add HIDIOCREVOKE ioctl Message-ID: <20240821065936.GA635104@quokka> References: <20240812052753.GA478917@quokka> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hi Jiri, On Wed, Aug 21, 2024 at 02:31:32AM +0200, Jiri Kosina wrote: > 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 > > Thanks Peter. Now queued in hid.git#for-6.12/hidraw. Benjamin just messaged me about a HID CI pipeline failure caused by this patch, looks like it's buggy. Can you please revert it again? I'll send out a fixed version ASAP, thanks. Cheeres, Peter