linux-kernel - Re: [PATCH] led-class.c permission change

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Date:	Sun, 6 May 2007 00:20:28 +0200
From:	Colin Leroy <colin@...ino.net>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Richard Purdie <rpurdie@...nedhand.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] led-class.c permission change

On 05 May 2007 at 22h05, Alan Cox wrote:

Hi, 

> > This patch changes the led brightness file's permissions to 0666,
> > so that a user's MUA can light up the mail LED without needing root
> > permissions.  
> 
> NAK.
> 
> The management of user specific temporary permissions belongs in user
> space with a safe "no" default value to stop background daemons doing
> silly things.

Mmh, ok... My usage pattern for this is for an MUA plugin[1] that does
write 1 to /sys/class/leds/asus:mail/brightness, for example, when new
mail comes. The MUA typically runs as user and until now most of the
handled LEDs had no such permission problems
(/proc/acpi/asus/mled, /proc/acpi/acer/mailled etc). 

So, I've got to find a way to write into that file as user so that
things automatically work.

> Take a look at the various pam console management modules (and also
> beat people up to get revoke() support into the kernel).

So, you suggest me to link my plugin to libpam and find something that
allows the plugin to write into /brightness? 

Thanks,

[1] http://www.claws-mail.org/plugin.php?plugin=acpinotifier
-- 
Colin

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