4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -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)) {