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libnvdimm, region : make 'resource' attribute only readable by root 

commit b8ff981f88 upstream.

For the same reason that /proc/iomem returns 0's for non-root readers
and acpi tables are root-only, make the 'resource' attribute for region
devices only readable by root. Otherwise we disclose physical address
information.

Fixes: 802f4be6fe ("libnvdimm: Add 'resource' sysfs attribute to regions")
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reported-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Dan Williams 2017-09-26 11:17:52 -07:00 committed by Greg Kroah-Hartman
parent 913ff23bac
commit d6667298d1
1 changed files with 6 additions and 2 deletions
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8
drivers/nvdimm/region_devs.c
View File

@ -562,8 +562,12 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
if (!is_nd_pmem(dev) && a == &dev_attr_badblocks.attr)
return 0;
if (!is_nd_pmem(dev) && a == &dev_attr_resource.attr)
return 0;
if (a == &dev_attr_resource.attr) {
if (is_nd_pmem(dev))
return 0400;
else
return 0;
}
if (a == &dev_attr_deep_flush.attr) {
int has_flush = nvdimm_has_flush(nd_region);