dm ima: update dm target attributes for ima measurements

Certain DM targets ('integrity', 'multipath', 'verity') need to update the
way their attributes are recorded in the ima log, so that the attestation
servers can interpret the data correctly and decide if the devices
meet the attestation requirements. For instance, the "mode=%c" attribute
in the 'integrity' target is measured twice, the 'verity' target is
missing the attribute "root_hash_sig_key_desc=%s", and the 'multipath'
target needs to index the attributes properly.

Update 'integrity' target to remove the duplicate measurement of
the attribute "mode=%c". Add "root_hash_sig_key_desc=%s" attribute
for the 'verity' target. Index various attributes in 'multipath'
target. Also, add "nr_priority_groups=%u" attribute to 'multipath'
target to record the number of priority groups.

Signed-off-by: Tushar Sugandhi <[e-mail]>
Suggested-by: Thore Sommer <[e-mail]>
Signed-off-by: Mike Snitzer <[e-mail]>

drivers/md/dm-integrity.c

···
 		DMEMIT(",journal_sectors=%u", ic->initial_sectors - SB_SECTORS);
 		DMEMIT(",interleave_sectors=%u", 1U << ic->sb->log2_interleave_sectors);
 		DMEMIT(",buffer_sectors=%u", 1U << ic->log2_buffer_sectors);
-		DMEMIT(",mode=%c", ic->mode);
 		DMEMIT(";");
 		break;
 	}

drivers/md/dm-mpath.c

···
 static void multipath_status(struct dm_target *ti, status_type_t type,
 			     unsigned status_flags, char *result, unsigned maxlen)
 {
-	int sz = 0;
+	int sz = 0, pg_counter, pgpath_counter;
 	unsigned long flags;
 	struct multipath *m = ti->private;
 	struct priority_group *pg;
···
 		break;
 
 	case STATUSTYPE_IMA:
+		sz = 0; /*reset the result pointer*/
+
 		DMEMIT_TARGET_NAME_VERSION(ti->type);
+		DMEMIT(",nr_priority_groups=%u", m->nr_priority_groups);
+
+		pg_counter = 0;
 		list_for_each_entry(pg, &m->priority_groups, list) {
 			if (pg->bypassed)
 				state = 'D';	/* Disabled */
···
 				state = 'A';	/* Currently Active */
 			else
 				state = 'E';	/* Enabled */
-			DMEMIT(",pg_state=%c", state);
-			DMEMIT(",nr_pgpaths=%u", pg->nr_pgpaths);
-			DMEMIT(",path_selector_name=%s", pg->ps.type->name);
+			DMEMIT(",pg_state_%d=%c", pg_counter, state);
+			DMEMIT(",nr_pgpaths_%d=%u", pg_counter, pg->nr_pgpaths);
+			DMEMIT(",path_selector_name_%d=%s", pg_counter, pg->ps.type->name);
 
+			pgpath_counter = 0;
 			list_for_each_entry(p, &pg->pgpaths, list) {
-				DMEMIT(",path_name=%s,is_active=%c,fail_count=%u",
-				       p->path.dev->name, p->is_active ? 'A' : 'F',
-				       p->fail_count);
+				DMEMIT(",path_name_%d_%d=%s,is_active_%d_%d=%c,fail_count_%d_%d=%u",
+				       pg_counter, pgpath_counter, p->path.dev->name,
+				       pg_counter, pgpath_counter, p->is_active ? 'A' : 'F',
+				       pg_counter, pgpath_counter, p->fail_count);
 				if (pg->ps.type->status) {
-					DMEMIT(",path_selector_status=");
+					DMEMIT(",path_selector_status_%d_%d=",
+					       pg_counter, pgpath_counter);
 					sz += pg->ps.type->status(&pg->ps, &p->path,
 								  type, result + sz,
 								  maxlen - sz);
 				}
+				pgpath_counter++;
 			}
+			pg_counter++;
 		}
 		DMEMIT(";");
 		break;

drivers/md/dm-verity-target.c

···
 
 		DMEMIT(",ignore_zero_blocks=%c", v->zero_digest ? 'y' : 'n');
 		DMEMIT(",check_at_most_once=%c", v->validated_blocks ? 'y' : 'n');
+		if (v->signature_key_desc)
+			DMEMIT(",root_hash_sig_key_desc=%s", v->signature_key_desc);
 
 		if (v->mode != DM_VERITY_MODE_EIO) {
 			DMEMIT(",verity_mode=");