linux-kernel - Re: [PATCH] clocksource: Fix permissions for available

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Date:	Fri, 2 May 2008 16:36:37 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clocksource: Fix permissions for available_clocksource

On Fri, 2 May 2008, Heiko Carstens wrote:
> From: Heiko Carstens <heiko.carstens@...ibm.com>
> 
> File permissions for
> /sys/devices/system/clocksource/clocksource0/available_clocksource
> are 600 which allows write access. But this is in fact a read only
> file. So change permissions to 400.

Indeed. The question is whether we should make this 444. There is no
harm, when users can read the info. Same applies for the
current_clocksource entry, making it 644 should be fine.
 
Thanks,
	tglx

> Cc: John Stultz <johnstul@...ibm.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
> ---
>  kernel/time/clocksource.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/kernel/time/clocksource.c
> ===================================================================
> --- linux-2.6.orig/kernel/time/clocksource.c
> +++ linux-2.6/kernel/time/clocksource.c
> @@ -474,7 +474,7 @@ sysfs_show_available_clocksources(struct
>  static SYSDEV_ATTR(current_clocksource, 0600, sysfs_show_current_clocksources,
>  		   sysfs_override_clocksource);
>  
> -static SYSDEV_ATTR(available_clocksource, 0600,
> +static SYSDEV_ATTR(available_clocksource, 0400,
>  		   sysfs_show_available_clocksources, NULL);
>  
>  static struct sysdev_class clocksource_sysclass = {
> 
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