From: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Date: Thu, 12 Mar 2015 13:58:27 +0000 (-0400)
Subject: sysfs: Only accept read/write permissions for file attributes
X-Git-Tag: omap-for-v4.1/fixes-rc1~166^2~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d8bf8c92e80fed9119eb222c7e5cc88acf57c12c;p=pandora-kernel.git

sysfs: Only accept read/write permissions for file attributes

For sysfs file attributes, only read and write permissions make sense.
Mask provided attribute permissions accordingly and send a warning
to the console if invalid permission bits are set.

This patch is originally from Guenter [1] and includes the fixup
explained in the thread, that is printing permissions in octal format
and limiting the scope of attributes to SYSFS_PREALLOC | 0664.

[1] https://lkml.org/lkml/2015/1/19/599

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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