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

Patch "libnvdimm, namespace: 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, namespace: 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-namespace-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 c1fb3542074fd0c4d901d778bd52455111e4eb6f Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 26 Sep 2017 11:21:24 -0700
Subject: libnvdimm, namespace: make 'resource' attribute only readable by root

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

commit c1fb3542074fd0c4d901d778bd52455111e4eb6f 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
namespace devices only readable by root. Otherwise we disclose physical
address information.

Fixes: bf9bccc14c05 ("libnvdimm: pmem label sets and namespace instantiation")
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/namespace_devs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1451,7 +1451,7 @@ static umode_t namespace_visible(struct
 	if (a == &dev_attr_resource.attr) {
 		if (is_namespace_blk(dev))
 			return 0;
-		return a->mode;
+		return 0400;
 	}
 
 	if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {


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