Patch "libnvdimm, pfn: make 'resource' attribute only readable by root" has been added to the 4.9-stable tree

Patch "libnvdimm, pfn: make 'resource' attribute only readable by root" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     libnvdimm-pfn-make-resource-attribute-only-readable-by-root.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 26417ae4fc6108f8db436f24108b08f68bdc520e Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 26 Sep 2017 13:07:06 -0700
Subject: libnvdimm, pfn: make 'resource' attribute only readable by root

From: Dan Williams <dan.j.williams@intel.com>

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>

---
 drivers/nvdimm/pfn_devs.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -270,8 +270,16 @@ static struct attribute *nd_pfn_attribut
 	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[] = {


Patches currently in stable-queue which might be from dan.j.williams@intel.com are

queue-4.9/libnvdimm-pfn-make-resource-attribute-only-readable-by-root.patch
queue-4.9/libnvdimm-namespace-make-resource-attribute-only-readable-by-root.patch
queue-4.9/libnvdimm-namespace-fix-label-initialization-to-use-valid-seq-numbers.patch