Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 065/138] libnvdimm, pfn: make resource attribute only readable by root | Date | Tue, 28 Nov 2017 11:22:46 +0100 |
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4.9-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 26417ae4fc6108f8db436f24108b08f68bdc520e 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 pfn devices only readable by root. Otherwise we disclose physical address information.
Fixes: f6ed58c70d14 ("libnvdimm, pfn: 'resource'-address and 'size'...") 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/pfn_devs.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/drivers/nvdimm/pfn_devs.c +++ b/drivers/nvdimm/pfn_devs.c @@ -270,8 +270,16 @@ static struct attribute *nd_pfn_attribut NULL, }; +static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n) +{ + if (a == &dev_attr_resource.attr) + return 0400; + return a->mode; +} + struct attribute_group nd_pfn_attribute_group = { .attrs = nd_pfn_attributes, + .is_visible = pfn_visible, }; static const struct attribute_group *nd_pfn_attribute_groups[] = {
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