libselinux: selabel_digest -b x/media/db error

[stillyger]

After the commit 65c8fd4, the following error is reported:

[root@localhost ~]# selabel_digest -b db
ERROR: selabel_open: Invalid argument
[root@localhost ~]# 
[root@localhost ~]# selabel_digest -b x
ERROR: selabel_open: Invalid argument
[root@localhost ~]# 
[root@localhost ~]# 
[root@localhost ~]# selabel_digest -b media
ERROR: selabel_open: Invalid argument
[root@localhost ~]#

libselinux/utils/selabel_digest.c +74
The main function sets the type to SELABEL_OPT_PATH, SELABEL_OPT_BASEONLY and SELABEL_OPT_DIGEST.

	struct selinux_opt selabel_option[] = {
		{ SELABEL_OPT_PATH, file },
		{ SELABEL_OPT_BASEONLY, baseonly },
		{ SELABEL_OPT_DIGEST, digest }
	};

libselinux/src/label_media.c +85
In init, the supported types are SELABEL_OPT_PATH, SELABEL_OPT_UNUSED, SELABEL_OPT_VALIDATE and SELABEL_OPT_DIGEST.
Type SELABEL_OPT_BASEONLY is not supported.

	/* Process arguments */
	while (n) {
		n--;
		switch(opts[n].type) {
		case SELABEL_OPT_PATH:
			path = opts[n].value;
			break;
		case SELABEL_OPT_UNUSED:
		case SELABEL_OPT_VALIDATE:
		case SELABEL_OPT_DIGEST:
			break;
		default:
			errno = EINVAL;
			return -1;
		}
}

So when we go to type SELABEL_OPT_BASEONLY， the init func return failure.

[bachradsusi]

Proposed fix - https://lore.kernel.org/selinux/20240313111025.43720-5-cgzones@googlemail.com/T/#m750850db6e78d2e6b4c80d5e4fe95bd45e8eafc0