linux-kernel - [PATCH 2/3] libnvdimm, namespace: make 'resource' attribute only readable by root

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Message-ID: <150646664054.6588.4993849833026629042.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Tue, 26 Sep 2017 15:57:20 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH 2/3] libnvdimm,
 namespace: make 'resource' attribute only readable by root

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")
Cc: <stable@...r.kernel.org>
Reported-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/namespace_devs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 3e4d1e7998da..0af988739a06 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1620,7 +1620,7 @@ static umode_t namespace_visible(struct kobject *kobj,
 	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)) {