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authorDan Williams <dan.j.williams@intel.com>2017-09-26 11:17:52 -0700
committerDan Williams <dan.j.williams@intel.com>2017-09-28 09:13:06 -0700
commitb8ff981f88df03c72a4de2f6eaa9ce447a10ac03 (patch)
treea579c2ee08e7a64aa872a19dae3507a74a9b4471 /drivers/nvdimm
parentd083e6dae083ba3576ee454d5cab4491d9c21ec5 (diff)
downloadlinux-b8ff981f88df03c72a4de2f6eaa9ce447a10ac03.tar.bz2
libnvdimm, region : make 'resource' attribute only readable by root
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: 802f4be6feee ("libnvdimm: Add 'resource' sysfs attribute to regions") Cc: <stable@vger.kernel.org> 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>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/region_devs.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 829d760f651c..abaf38c61220 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -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);