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authorDan Williams <dan.j.williams@intel.com>2017-09-26 13:07:06 -0700
committerDan Williams <dan.j.williams@intel.com>2017-09-28 09:13:06 -0700
commit26417ae4fc6108f8db436f24108b08f68bdc520e (patch)
treebbfe1892d5a968c15e55571535f1ed82cb08766a /drivers/nvdimm/pfn_devs.c
parentc1fb3542074fd0c4d901d778bd52455111e4eb6f (diff)
libnvdimm, pfn: 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 pfn devices only readable by root. Otherwise we disclose physical address information. Fixes: f6ed58c70d14 ("libnvdimm, pfn: 'resource'-address and 'size'...") Cc: <stable@vger.kernel.org> Reported-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/pfn_devs.c')
-rw-r--r--drivers/nvdimm/pfn_devs.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 9576c444f0ab..65cc171c721d 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -282,8 +282,16 @@ static struct attribute *nd_pfn_attributes[] = {
NULL,
};
+static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n)
+{
+ if (a == &dev_attr_resource.attr)
+ return 0400;
+ return a->mode;
+}
+
struct attribute_group nd_pfn_attribute_group = {
.attrs = nd_pfn_attributes,
+ .is_visible = pfn_visible,
};
static const struct attribute_group *nd_pfn_attribute_groups[] = {