Patch "libnvdimm, region : make 'resource' attribute only readable by root" has been added to the 4.14-stable tree

Patch "libnvdimm, region : make 'resource' attribute only readable by root" has been added to the 4.14-stable tree

[gregkh]

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

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

to the 4.14-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-region-make-resource-attribute-only-readable-by-root.patch
and it can be found in the queue-4.14 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 b8ff981f88df03c72a4de2f6eaa9ce447a10ac03 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 26 Sep 2017 11:17:52 -0700
Subject: libnvdimm, region : make 'resource' attribute only readable by root

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

commit b8ff981f88df03c72a4de2f6eaa9ce447a10ac03 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 region
devices only readable by root. Otherwise we disclose physical address
information.

Fixes: 802f4be6feee ("libnvdimm: Add 'resource' sysfs attribute to regions")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/nvdimm/region_devs.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -562,8 +562,12 @@ static umode_t region_visible(struct kob
 	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);


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

queue-4.14/libnvdimm-dimm-clear-locked-status-on-successful-dimm-enable.patch
queue-4.14/libnvdimm-pfn-make-resource-attribute-only-readable-by-root.patch
queue-4.14/libnvdimm-region-make-resource-attribute-only-readable-by-root.patch
queue-4.14/dax-fix-pmd-faults-on-zero-length-files.patch
queue-4.14/libnvdimm-namespace-make-resource-attribute-only-readable-by-root.patch
queue-4.14/dax-fix-general-protection-fault-in-dax_alloc_inode.patch
queue-4.14/libnvdimm-namespace-fix-label-initialization-to-use-valid-seq-numbers.patch