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Date: Tue, 18 Jul 2006 08:20:04 -0400 From: "Dmitry Torokhov" <dmitry.torokhov@...il.com> To: "Anssi Hannula" <anssi.hannula@...il.com> Cc: linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org Subject: Re: input/eventX permissions, force feedback Hi Anssi, On 7/18/06, Anssi Hannula <anssi.hannula@...il.com> wrote: > Currently most distributions have /dev/input/event* strictly as 0600 > root:root or 0640 root:root. The user logged in will not have rights to > the device, unlike /dev/input/js*, as he could read all passwords from > the keyboard device. > > This is a problem, because /dev/input/event* is used for force feedback > and should therefore be user-accessible. > > I can think of the following solutions to this problem: > > 1. Some creative udev rule to chmod /dev/input/event* less strictly when > it has a /dev/input/js* and is thus a gaming device. > > 2. Some creative udev rule to chmod /dev/input/event* more strictly when > it is a keyboard. > > 3. Have another force feedback interface also in /dev/input/js*. > You can do it in udev looking either at MODALIAS or at EV and ABS environment variables. I think it is pretty safe to say that a device with EV_ABS, EV_FF, ABS_X and ABS_Y is a force-feedback joystick-type device and not a keyboard. Another solution would be to relax permissions if user is also console owner (home box installation). One thing is for sure - I do not like #3 at all ;) -- Dmitry - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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