alpine 3.6
access weakness #307


Weakness Breakdown


An access weakness occurs when software does not properly implement permissions that could have unintended consequences if exploited by malicious actors. An example of this weakness is when a default username and password are set by the developer but do not get changed by the system administrator.

Warning code(s):

Ensure that umask is given most restrictive possible setting.

File Name:



The highlighted line of code below is the trigger point of this particular Alpine 3.6 access weakness.

 	old_mask = umask(0077);

	/* Open local socket */
	if ((local_socket = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
		log_error("Can't create local socket: %m");
		goto error;

	/* Set Close-on-exec & non-blocking */
	if (fcntl(local_socket, F_SETFD, 1))
		DEBUGLOG("setting CLOEXEC on local_socket failed: %s\n", strerror(errno));
	if (fcntl(local_socket, F_SETFL, fcntl(local_socket, F_GETFL, 0) | O_NONBLOCK))
		DEBUGLOG("setting O_NONBLOCK on local_socket failed: %s\n", strerror(errno));

	if (bind(local_socket, (struct sockaddr *) &sockaddr, sizeof(sockaddr))) {
		log_error("can't bind local socket: %m");
		goto error;
	if (listen(local_socket, 1) != 0) {
		log_error("listen local: %m");
		goto error;

	(void) dm_prepare_selinux_context(NULL, 0);
	return local_socket;
	(void) dm_prepare_selinux_context(NULL, 0);
	return -1;

void process_message(struct local_client *client, char *buf, int len,
		     const char *csid)
	char nodename[max_cluster_member_name_len];
	struct clvm_header *inheader = (struct clvm_header *) buf;
	ntoh_clvm(inheader);	/* Byteswap fields */

	if (verify_message(buf, len) < 0) {
		clops->name_from_csid(csid, nodename);
		log_error("process_message from %s len %d bad verify.", nodename, len);
		dump_message(buf, len);

	if (inheader->cmd == CLVMD_CMD_REPLY)
		process_reply(inheader, len, csid); 

The registered trademark Linux® is used pursuant to a sublicense from the Linux Foundation, the exclusive licensee of Linus Torvalds, owner of the mark on a world­wide basis.