linux-kernel - Re: [PATCH 3/9] drivers/hid/hid-lg4ff.c: avoid world-writable sysfs files.

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Message-ID: <87eh0nfly3.fsf@rustcorp.com.au>
Date:	Thu, 24 Apr 2014 12:55:24 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	simon@...gewell.org
Cc:	Michal Malý <madcatxster@...oid-pointer.net>,
	linux-kernel@...r.kernel.org,
	HID CORE LAYER <linux-input@...r.kernel.org>,
	"Greg KH" <greg@...ah.com>
Subject: Re: [PATCH 3/9] drivers/hid/hid-lg4ff.c: avoid world-writable sysfs files.

simon@...gewell.org writes:
>> simon@...gewell.org writes:
>>> Yep I'm OK with that, however what it the recommended way to make sure
>>> that the end user is able to send changes to this /sys portal? I asked
>>> the
>>> same question before regarding the led class /sys interface, but never
>>> got
>>> any suggestions.
>>>
>>> Signed-off-by: Simon Wood <simon@...gewell.org>
>>
>> If you need that, we'll need to make an exception.  That's one purpose
>> of spamming everyone with these changs...
>
>
> What's the right way of doing it?... I don't need to be 'special'. ;-)
>
> The '/sys/.../range' control allows the user to limit the rotation of the
> gaming wheel from a maximum of 900' down to match the 'car' they
> sim-driving. Probably not many people use it, but it probably should be
> assigned properly.
>
> With gaming controllers the /dev/input/event* seem to get set
> appropriately, but I'm not sure how this happens.
>
> The same /should/ also happen for all the LED class controls, I don't want
> to have to 'sudo' just to set a LED on/off. This is currently a problem
> for (at least) hid-lg, hid-sony and hid-steelseries.
> Simon

I think this is a udev duty.  Someone needs to chmod/chown/chgrp the
files if you want to allow a particular group/user access (I just
checked, that works fot sysfs files).

I have no idea about HID, so I don't know how you'd figure out who that
user/group is...

Cheers,
Rusty.
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