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 4.4-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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c1fb3542074fd0c4d901d778bd52455111e4eb6f Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@xxxxxxxxx>
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@xxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1305,7 +1305,7 @@ 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@xxxxxxxxx are
queue-4.4/libnvdimm-namespace-make-resource-attribute-only-readable-by-root.patch
queue-4.4/libnvdimm-namespace-fix-label-initialization-to-use-valid-seq-numbers.patch