cov: avoid using strcpy

Coverity is complaining about unchecked strcpy here, which is
irelevant as we preallocate buffer to fit in copied string,
however we could actually reuse these size and use just memcpy().
So lets make some simple conversions.

device_mapper/ioctl/libdm-iface.c

@@ -843,8 +843,8 @@ int dm_task_get_device_list(struct dm_task *dmt, struct dm_list **devs_list,
 		dm_dev->event_nr = 0;
 		dm_dev->uuid = NULL;
 
-		strcpy(dm_dev->name, names->name);
 		len = strlen(names->name) + 1;
+		memcpy(dm_dev->name, names->name, len);
 
 		dm_new_dev = _align_ptr((char*)(dm_dev + 1) + len);
 		if (_check_has_event_nr()) {
@@ -862,8 +862,9 @@ int dm_task_get_device_list(struct dm_task *dmt, struct dm_list **devs_list,
 				*devs_features |= DM_DEVICE_LIST_HAS_UUID;
 				uuid_ptr = _align_ptr(event_nr + 2);
 				dm_dev->uuid = (char*) dm_new_dev;
-				dm_new_dev = _align_ptr((char*)dm_new_dev + strlen(uuid_ptr) + 1);
+				len = strlen(uuid_ptr) + 1;
-				strcpy(dm_dev->uuid, uuid_ptr);
+				dm_new_dev = _align_ptr((char*)dm_new_dev + len);
+				memcpy(dm_dev->uuid, uuid_ptr, len);
 				if (!dm_hash_insert(devs->uuids, dm_dev->uuid, dm_dev))
 					return_0; // FIXME
 #if 0
@@ -1201,9 +1202,10 @@ static char *_add_target(struct target *t, char *out, char *end)
 	while (*pt)
 		if (*pt++ == '\\')
 			backslash_count++;
-	len = strlen(t->params) + backslash_count;
 
-	if ((out >= end) || (out + len + 1) >= end) {
+	len = strlen(t->params) + 1;
+
+	if ((out >= end) || (out + len + backslash_count) >= end) {
 		log_error("Ran out of memory building ioctl parameter");
 		return NULL;
 	}
@@ -1219,8 +1221,8 @@ static char *_add_target(struct target *t, char *out, char *end)
 		*out++ = '\0';
 	}
 	else {
-		strcpy(out, t->params);
+		memcpy(out, t->params, len);
-		out += len + 1;
+		out += len + backslash_count;
 	}
 
 	/* align next block */
@@ -1291,6 +1293,7 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
 	struct target *t;
 	struct dm_target_msg *tmsg;
 	size_t len = sizeof(struct dm_ioctl);
+	size_t message_len = 0, newname_len = 0, geometry_len = 0;
 	char *b, *e;
 	int count = 0;
 
@@ -1351,14 +1354,20 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
 		return NULL;
 	}
 
-	if (dmt->newname)
+	if (dmt->newname) {
-		len += strlen(dmt->newname) + 1;
+		newname_len = strlen(dmt->newname) + 1;
+		len += newname_len;
+	}
 
-	if (dmt->message)
+	if (dmt->message) {
-		len += sizeof(struct dm_target_msg) + strlen(dmt->message) + 1;
+		message_len = strlen(dmt->message) + 1;
+		len += sizeof(struct dm_target_msg) + message_len;
+	}
 
-	if (dmt->geometry)
+	if (dmt->geometry) {
-		len += strlen(dmt->geometry) + 1;
+		geometry_len = strlen(dmt->geometry) + 1;
+		len += geometry_len;
+	}
 
 	/*
 	 * Give len a minimum size so that we have space to store
@@ -1480,16 +1489,16 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
 				goto_bad;
 
 	if (dmt->newname)
-		strcpy(b, dmt->newname);
+		memcpy(b, dmt->newname, newname_len);
 
 	if (dmt->message) {
 		tmsg = (struct dm_target_msg *) b;
 		tmsg->sector = dmt->sector;
-		strcpy(tmsg->message, dmt->message);
+		memcpy(tmsg->message, dmt->message, message_len);
 	}
 
 	if (dmt->geometry)
-		strcpy(b, dmt->geometry);
+		memcpy(b, dmt->geometry, geometry_len);
 
 	return dmi;
 

lib/activate/fs.c

@@ -318,9 +318,10 @@ struct fs_op_parms {
 
 static void _store_str(char **pos, char **ptr, const char *str)
 {
-	strcpy(*pos, str);
+	size_t len = strlen(str) + 1;
+	memcpy(*pos, str, len);
 	*ptr = *pos;
-	*pos += strlen(*ptr) + 1;
+	*pos += len;
 }
 
 static void _del_fs_op(struct fs_op_parms *fsp)

lib/commands/toolcontext.c

@@ -1581,7 +1581,7 @@ struct cmd_context *create_config_context(void)
 	if (!(cmd = zalloc(sizeof(*cmd))))
 		goto_out;
 
-	strcpy(cmd->system_dir, DEFAULT_SYS_DIR);
+	strncpy(cmd->system_dir, DEFAULT_SYS_DIR, sizeof(cmd->system_dir) - 1);
 
 	if (!_get_env_vars(cmd))
 		goto_out;
@@ -1713,10 +1713,8 @@ struct cmd_context *create_toolcontext(unsigned is_clvmd,
 	/*
 	 * Environment variable LVM_SYSTEM_DIR overrides this below.
 	 */
-        if (system_dir)
+	strncpy(cmd->system_dir, (system_dir) ? system_dir : DEFAULT_SYS_DIR,
-		strncpy(cmd->system_dir, system_dir, sizeof(cmd->system_dir) - 1);
+		sizeof(cmd->system_dir) - 1);
-	else
-		strcpy(cmd->system_dir, DEFAULT_SYS_DIR);
 
 	if (!_get_env_vars(cmd))
 		goto_out;

lib/format_text/format-text.c

@@ -1389,7 +1389,7 @@ static int _vg_commit_file(struct format_instance *fid, struct volume_group *vg,
 	struct text_context *tc = (struct text_context *) mda->metadata_locn;
 	const char *slash;
 	char new_name[PATH_MAX];
-	size_t len;
+	size_t len, vglen;
 
 	if (!_vg_commit_file_backup(fid, vg, mda))
 		return 0;
@@ -1401,14 +1401,15 @@ static int _vg_commit_file(struct format_instance *fid, struct volume_group *vg,
 		slash = tc->path_live;
 
 	if (strcmp(slash, vg->name)) {
+		vglen = strlen(vg->name) + 1;
 		len = slash - tc->path_live;
-		if ((len + strlen(vg->name)) > (sizeof(new_name) - 1)) {
+		if ((len + vglen) > (sizeof(new_name) - 1)) {
 			log_error("Renaming path %s is too long for VG %s.",
 				  tc->path_live, vg->name);
 			return 0;
 		}
 		strncpy(new_name, tc->path_live, len);
-		strcpy(new_name + len, vg->name);
+		memcpy(new_name + len, vg->name, vglen);
 		log_debug_metadata("Renaming %s to %s", tc->path_live, new_name);
 		if (test_mode())
 			log_verbose("Test mode: Skipping rename");