linux-kernel - Re: [PATCH] sysfs: change permissions for /sys from 0755 to 0555

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Message-ID: <43fec27192a0a3b8ed2bd4e3af55494d@hadoop.ru>
Date:	Tue, 20 Dec 2011 16:34:24 +0400
From:	Vitaly Kuznetsov <vitty@...linux.ru>
To:	<ebiederm@...ssion.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysfs: change permissions for /sys from 0755 to 0555

On Sun, 18 Dec 2011 18:32:18 -0800, ebiederm@...ssion.com wrote:
> Vitaly Kuznetsov <vitty@...linux.ru> writes:
>
>> There is a misleading difference between /proc and /sys permissions, 
>> /proc is
>> 0555 and /sys is 0755. But
>> as it is impossible to create or unlink something in /sys it would 
>> be nice to
>> have same permissions.
>
> Where does this difference matter?  This doesn't look like something
> that could matter in practice.  If this does matter in practice this
> change deserves a comment and a fuller explanation.

This matters only for programs which 'read' permissions instead of 
'testing' them, but it's a challenge to imagine such program.

>
> The change itself seems reasonable and probably worth making as 
> general
> cleanup.
>

Let's consider it cleanup-only. The main idea is: /proc and /sys 
permissions must be the same as they are really the same.
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