Function sys___mac_get_pid

freebsd/security/mac/mac_syscalls.c:84–131

		    struct mac *mac_p, int follow);

int
sys___mac_get_pid(struct thread *td, struct __mac_get_pid_args *uap)
{
	char *elements, *buffer;
	struct mac mac;
	struct proc *tproc;
	struct ucred *tcred;
	int error;

	error = copyin(uap->mac_p, &mac, sizeof(mac));
	if (error)
		return (error);

	error = mac_check_structmac_consistent(&mac);
	if (error)
		return (error);

	tproc = pfind(uap->pid);
	if (tproc == NULL)
		return (ESRCH);

	tcred = NULL;				/* Satisfy gcc. */
	error = p_cansee(td, tproc);
	if (error == 0)
		tcred = crhold(tproc->p_ucred);
	PROC_UNLOCK(tproc);
	if (error)
		return (error);

	elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
	error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
	if (error) {
		free(elements, M_MACTEMP);
		crfree(tcred);
		return (error);
	}

	buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
	error = mac_cred_externalize_label(tcred->cr_label, elements,
	    buffer, mac.m_buflen);
	if (error == 0)
		error = copyout(buffer, mac.m_string, strlen(buffer)+1);

	free(buffer, M_MACTEMP);
	free(elements, M_MACTEMP);
	crfree(tcred);
	return (error);
}

int
sys___mac_get_proc(struct thread *td, struct __mac_get_proc_args *uap)