From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 26 Sep 2017 20:07:06 +0000 (-0700)
Subject: libnvdimm, pfn: make 'resource' attribute only readable by root
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9a31016ea05be4c90ddf691f29aaf999e606e55e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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

commit 26417ae4fc6108f8db436f24108b08f68bdc520e 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 pfn
devices only readable by root. Otherwise we disclose physical address
information.

Fixes: f6ed58c70d14 ("libnvdimm, pfn: 'resource'-address and 'size'...")
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>
---

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[] = {