libnvdimm/label: Clear 'updating' flag after label-set update

commit 966d23a006ca7b44ac8cf4d0c96b19785e0c3da0 upstream.

The UEFI 2.7 specification sets expectations that the 'updating' flag is
eventually cleared. To date, the libnvdimm core has never adhered to
that protocol. The policy of the core matches the policy of other
multi-device info-block formats like MD-Software-RAID that expect
administrator intervention on inconsistent info-blocks, not automatic
invalidation.

However, some pre-boot environments may unfortunately attempt to "clean
up" the labels and invalidate a set when it fails to find at least one
"non-updating" label in the set. Clear the updating flag after set
updates to minimize the window of vulnerability to aggressive pre-boot
environments.

Ideally implementations would not write to the label area outside of
creating namespaces.

Note that this only minimizes the window, it does not close it as the
system can still crash while clearing the flag and the set can be
subsequently deleted / invalidated by the pre-boot environment.

Fixes: f524bf271a5c ("libnvdimm: write pmem label set")
Cc: <stable@vger.kernel.org>
Cc: Kelly Couch <kelly.j.couch@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c
index d8d189d14834..66a089d561cf 100644
--- a/drivers/nvdimm/label.c
+++ b/drivers/nvdimm/label.c
@@ -492,7 +492,7 @@ static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd,
 
 static int __pmem_label_update(struct nd_region *nd_region,
 		struct nd_mapping *nd_mapping, struct nd_namespace_pmem *nspm,
-		int pos)
+		int pos, unsigned long flags)
 {
 	u64 cookie = nd_region_interleave_set_cookie(nd_region);
 	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
@@ -530,7 +530,7 @@ static int __pmem_label_update(struct nd_region *nd_region,
 	memcpy(nd_label->uuid, nspm->uuid, NSLABEL_UUID_LEN);
 	if (nspm->alt_name)
 		memcpy(nd_label->name, nspm->alt_name, NSLABEL_NAME_LEN);
-	nd_label->flags = __cpu_to_le32(NSLABEL_FLAG_UPDATING);
+	nd_label->flags = __cpu_to_le32(flags);
 	nd_label->nlabel = __cpu_to_le16(nd_region->ndr_mappings);
 	nd_label->position = __cpu_to_le16(pos);
 	nd_label->isetcookie = __cpu_to_le64(cookie);
@@ -922,13 +922,13 @@ static int del_labels(struct nd_mapping *nd_mapping, u8 *uuid)
 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
 		struct nd_namespace_pmem *nspm, resource_size_t size)
 {
-	int i;
+	int i, rc;
 
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 		struct resource *res;
-		int rc, count = 0;
+		int count = 0;
 
 		if (size == 0) {
 			rc = del_labels(nd_mapping, nspm->uuid);
@@ -946,7 +946,20 @@ int nd_pmem_namespace_label_update(struct nd_region *nd_region,
 		if (rc < 0)
 			return rc;
 
-		rc = __pmem_label_update(nd_region, nd_mapping, nspm, i);
+		rc = __pmem_label_update(nd_region, nd_mapping, nspm, i,
+				NSLABEL_FLAG_UPDATING);
+		if (rc)
+			return rc;
+	}
+
+	if (size == 0)
+		return 0;
+
+	/* Clear the UPDATING flag per UEFI 2.7 expectations */
+	for (i = 0; i < nd_region->ndr_mappings; i++) {
+		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
+
+		rc = __pmem_label_update(nd_region, nd_mapping, nspm, i, 0);
 		if (rc)
 			return rc;
 	}