static int valid_ecryptfs_desc(const char *ecryptfs_desc)
{
	int i;

	if (strlen(ecryptfs_desc) != KEY_ECRYPTFS_DESC_LEN) {
		pr_err("encrypted_key: key description must be %d hexadecimal "
		       "characters long\n", KEY_ECRYPTFS_DESC_LEN);
		return -EINVAL;
	}

	for (i = 0; i < KEY_ECRYPTFS_DESC_LEN; i++) {
		if (!isxdigit(ecryptfs_desc[i])) {
			pr_err("encrypted_key: key description must contain "
			       "only hexadecimal characters\n");
			return -EINVAL;
		}
	}

	return 0;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.