lkml.org 
[lkml]   [2006]   [Jul]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: input/eventX permissions, force feedback
    Andrey Borzenkov wrote:
    > Dmitry Torokhov wrote:
    >
    >
    >>Hi Anssi,
    >>
    >>On 7/18/06, Anssi Hannula <anssi.hannula@gmail.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.
    >>
    >
    >
    > You could also have udev create specific symlink for such devices,
    > say /dev/input/ff* and make a rule for pam_console to change their
    > permissions. That is finally what is done e.g. for CD-ROMs (cdrom ->
    > hdc/sr0)

    Yes, I proposed this kind of solution too in a later post :)

    >
    >
    >>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 ;)
    >>
    >
    >


    --
    Anssi Hannula

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2006-07-18 19:11    [W:0.024 / U:1.076 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site