Messages in this thread Patch in this message | | | Subject | [PATCH 2/3] libnvdimm, namespace: make 'resource' attribute only readable by root | From | Dan Williams <> | Date | Tue, 26 Sep 2017 15:57:20 -0700 |
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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@vger.kernel.org> Reported-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.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)) {
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