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zram: restrict add/remove attributes to root only

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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.

[[email protected]: s/sence/sense/, reflow comment to use 80 cols]
Fixes: 6566d1a32b ("zram: add dynamic device add/remove functionality")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Sergey Senozhatsky <[email protected]>
Reported-by: Steven Allen <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: <[email protected]>    [4.2+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Sergey Senozhatsky 2016-12-07 14:44:31 -08:00 • committed by Linus Torvalds
commit 5c7e9ccd91
1 changed files with 7 additions and 1 deletions
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8
drivers/block/zram/zram_drv.c
View file

@ -1413,8 +1413,14 @@ static ssize_t hot_remove_store(struct class *class,
return ret ? ret : count;
}
/*
* NOTE: hot_add attribute is not the usual read-only sysfs attribute. In a
* sense that reading from this file does alter the state of your system -- it
* creates a new un-initialized zram device and returns back this device's
* device_id (or an error code if it fails to create a new device).
*/
static struct class_attribute zram_control_class_attrs[] = {
__ATTR_RO(hot_add),
__ATTR(hot_add, 0400, hot_add_show, NULL),
__ATTR_WO(hot_remove),
__ATTR_NULL,
};