zram: restrict add/remove attributes to root only
authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Wed, 7 Dec 2016 22:44:31 +0000 (14:44 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 8 Dec 2016 01:10:00 +0000 (17:10 -0800)
commit5c7e9ccd91b90d87029261f8856294ee51934cab
tree5bb12cbd8f271f71c1a7141ca7d86916ab92d71a
parentea5a9eff96fed8252f3a8c94a84959f981a93cae
zram: restrict add/remove attributes to root only

zram hot_add sysfs attribute is a very 'special' attribute - reading
from it creates a new uninitialized zram device.  This file, by a
mistake, can be read by a 'normal' user at the moment, while only root
must be able to create a new zram device, therefore hot_add attribute
must have S_IRUSR mode, not S_IRUGO.

[akpm@linux-foundation.org: s/sence/sense/, reflow comment to use 80 cols]
Fixes: 6566d1a32bf72 ("zram: add dynamic device add/remove functionality")
Link: http://lkml.kernel.org/r/20161205155845.20129-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reported-by: Steven Allen <steven@stebalien.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org> [4.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/block/zram/zram_drv.c