tree 76781b5c56d41e896e0b29cc0cd7e884ee4a22b8
parent da4759c73b0f1aac79f37bdb39ad2124439c30e7
author Vivien Didelot <vivien.didelot@savoirfairelinux.com> 1426168707 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1427286477 +0100

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>