IOReturn com_enkript_driver_Service::hello(task_t target)
{
  EKDebugLog("hello task 0x%x", target);
  kern_return_t ret = KERN_SUCCESS;
  /* allocate receive port
   */
  ret = ipc_port_alloc(get_task_ipcspace(current_task()), &exception_port_name, &exception_port);
  EKDebugLog("ipc_port_alloc() ret=%d", ret);
  if (ret) return kIOReturnError;  
  /* set task exception port
   */
  ret = task_set_exception_ports(target, EXC_MASK_ALL, ipc_port_make_send(exception_port), EXCEPTION_DEFAULT, THREAD_STATE_NONE);
  EKDebugLog("task_set_exception_ports() ret=%d", ret);
  if (ret) return kIOReturnError;  
  /* create exception handler thread
   */
  (void) kernel_thread(kernel_task, exception_handler);

  return kIOReturnSuccess;
}
Exemple #2
0
kern_return_t
task_name_for_pid(
	struct task_name_for_pid_args *args)
{
	mach_port_name_t	target_tport = args->target_tport;
	int			pid = args->pid;
	user_addr_t		task_addr = args->t;
	proc_t		p = PROC_NULL;
	task_t		t1;
	mach_port_name_t	tret;
	void * sright;
	int error = 0, refheld = 0;
	kauth_cred_t target_cred;

	AUDIT_MACH_SYSCALL_ENTER(AUE_TASKNAMEFORPID);
	AUDIT_ARG(pid, pid);
	AUDIT_ARG(mach_port1, target_tport);

	t1 = port_name_to_task(target_tport);
	if (t1 == TASK_NULL) {
		(void) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
		AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
		return(KERN_FAILURE);
	} 

	p = proc_find(pid);
	if (p != PROC_NULL) {
		AUDIT_ARG(process, p);
		target_cred = kauth_cred_proc_ref(p);
		refheld = 1;

		if ((p->p_stat != SZOMB)
		    && ((current_proc() == p)
			|| kauth_cred_issuser(kauth_cred_get()) 
			|| ((kauth_cred_getuid(target_cred) == kauth_cred_getuid(kauth_cred_get())) && 
			    ((kauth_cred_getruid(target_cred) == kauth_getruid()))))) {

			if (p->task != TASK_NULL) {
				task_reference(p->task);
#if CONFIG_MACF
				error = mac_proc_check_get_task_name(kauth_cred_get(),  p);
				if (error) {
					task_deallocate(p->task);
					goto noperm;
				}
#endif
				sright = (void *)convert_task_name_to_port(p->task);
				tret = ipc_port_copyout_send(sright, 
						get_task_ipcspace(current_task()));
			} else
				tret  = MACH_PORT_NULL;

			AUDIT_ARG(mach_port2, tret);
			(void) copyout((char *)&tret, task_addr, sizeof(mach_port_name_t));
			task_deallocate(t1);
			error = KERN_SUCCESS;
			goto tnfpout;
		}
	}

#if CONFIG_MACF
noperm:
#endif
    task_deallocate(t1);
	tret = MACH_PORT_NULL;
	(void) copyout((char *) &tret, task_addr, sizeof(mach_port_name_t));
	error = KERN_FAILURE;
tnfpout:
	if (refheld != 0)
		kauth_cred_unref(&target_cred);
	if (p != PROC_NULL)
		proc_rele(p);
	AUDIT_MACH_SYSCALL_EXIT(error);
	return(error);
}
Exemple #3
0
/*
 *	Routine:	task_for_pid
 *	Purpose:
 *		Get the task port for another "process", named by its
 *		process ID on the same host as "target_task".
 *
 *		Only permitted to privileged processes, or processes
 *		with the same user ID.
 *
 *		Note: if pid == 0, an error is return no matter who is calling.
 *
 * XXX This should be a BSD system call, not a Mach trap!!!
 */
kern_return_t
task_for_pid(
	struct task_for_pid_args *args)
{
	mach_port_name_t	target_tport = args->target_tport;
	int			pid = args->pid;
	user_addr_t		task_addr = args->t;
	proc_t 			p = PROC_NULL;
	task_t			t1 = TASK_NULL;
	mach_port_name_t	tret = MACH_PORT_NULL;
 	ipc_port_t 		tfpport;
	void * sright;
	int error = 0;

	AUDIT_MACH_SYSCALL_ENTER(AUE_TASKFORPID);
	AUDIT_ARG(pid, pid);
	AUDIT_ARG(mach_port1, target_tport);

	/* Always check if pid == 0 */
	if (pid == 0) {
		(void ) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
		AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
		return(KERN_FAILURE);
	}

	t1 = port_name_to_task(target_tport);
	if (t1 == TASK_NULL) {
		(void) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
		AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
		return(KERN_FAILURE);
	} 


	p = proc_find(pid);
	if (p == PROC_NULL) {
		error = KERN_FAILURE;
		goto tfpout;
	}

#if CONFIG_AUDIT
	AUDIT_ARG(process, p);
#endif

	if (!(task_for_pid_posix_check(p))) {
		error = KERN_FAILURE;
		goto tfpout;
	}

	if (p->task != TASK_NULL) {
		/* If we aren't root and target's task access port is set... */
		if (!kauth_cred_issuser(kauth_cred_get()) &&
			p != current_proc() &&
			(task_get_task_access_port(p->task, &tfpport) == 0) &&
			(tfpport != IPC_PORT_NULL)) {

			if (tfpport == IPC_PORT_DEAD) {
				error = KERN_PROTECTION_FAILURE;
				goto tfpout;
			}

			/* Call up to the task access server */
			error = check_task_access(tfpport, proc_selfpid(), kauth_getgid(), pid);

			if (error != MACH_MSG_SUCCESS) {
				if (error == MACH_RCV_INTERRUPTED)
					error = KERN_ABORTED;
				else
					error = KERN_FAILURE;
				goto tfpout;
			}
		}
#if CONFIG_MACF
		error = mac_proc_check_get_task(kauth_cred_get(), p);
		if (error) {
			error = KERN_FAILURE;
			goto tfpout;
		}
#endif

		/* Grant task port access */
		task_reference(p->task);
		extmod_statistics_incr_task_for_pid(p->task);

		sright = (void *) convert_task_to_port(p->task);
		tret = ipc_port_copyout_send(
				sright, 
				get_task_ipcspace(current_task()));
	} 
	error = KERN_SUCCESS;

tfpout:
	task_deallocate(t1);
	AUDIT_ARG(mach_port2, tret);
	(void) copyout((char *) &tret, task_addr, sizeof(mach_port_name_t));
	if (p != PROC_NULL)
		proc_rele(p);
	AUDIT_MACH_SYSCALL_EXIT(error);
	return(error);
}
Exemple #4
0
/*
 *	Routine:	task_for_pid
 *	Purpose:
 *		Get the task port for another "process", named by its
 *		process ID on the same host as "target_task".
 *
 *		Only permitted to privileged processes, or processes
 *		with the same user ID.
 *
 * XXX This should be a BSD system call, not a Mach trap!!!
 */
kern_return_t
task_for_pid(
	struct task_for_pid_args *args)
{
	mach_port_name_t	target_tport = args->target_tport;
	int			pid = args->pid;
	user_addr_t		task_addr = args->t;
	struct uthread		*uthread;
	proc_t 			p = PROC_NULL;
	task_t			t1 = TASK_NULL;
	mach_port_name_t	tret = MACH_PORT_NULL;
 	ipc_port_t 		tfpport;
	void * sright;
	int error = 0;

	AUDIT_MACH_SYSCALL_ENTER(AUE_TASKFORPID);
	AUDIT_ARG(pid, pid);
	AUDIT_ARG(mach_port1, target_tport);

#if defined(SECURE_KERNEL)
	if (0 == pid) {
		(void ) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
		AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
		return(KERN_FAILURE);
	}
#endif

	t1 = port_name_to_task(target_tport);
	if (t1 == TASK_NULL) {
		(void) copyout((char *)&t1, task_addr, sizeof(mach_port_name_t));
		AUDIT_MACH_SYSCALL_EXIT(KERN_FAILURE);
		return(KERN_FAILURE);
	} 


	/*
	 * Delayed binding of thread credential to process credential, if we
	 * are not running with an explicitly set thread credential.
	 */
	uthread = get_bsdthread_info(current_thread());
	kauth_cred_uthread_update(uthread, current_proc());

	p = proc_find(pid);
	AUDIT_ARG(process, p);

	if (!(task_for_pid_posix_check(p))) {
		error = KERN_FAILURE;
		goto tfpout;
	}

	if (p->task != TASK_NULL) {
		/* If we aren't root and target's task access port is set... */
		if (!kauth_cred_issuser(kauth_cred_get()) &&
			p != current_proc() &&
			(task_get_task_access_port(p->task, &tfpport) == 0) &&
			(tfpport != IPC_PORT_NULL)) {

			if (tfpport == IPC_PORT_DEAD) {
				error = KERN_PROTECTION_FAILURE;
				goto tfpout;
			}

			/* Call up to the task access server */
			error = check_task_access(tfpport, proc_selfpid(), kauth_getgid(), pid);

			if (error != MACH_MSG_SUCCESS) {
				if (error == MACH_RCV_INTERRUPTED)
					error = KERN_ABORTED;
				else
					error = KERN_FAILURE;
				goto tfpout;
			}
		}
#if CONFIG_MACF
		error = mac_proc_check_get_task(kauth_cred_get(), p);
		if (error) {
			error = KERN_FAILURE;
			goto tfpout;
		}
#endif

		/* Grant task port access */
		task_reference(p->task);
		sright = (void *) convert_task_to_port(p->task);
		tret = ipc_port_copyout_send(
				sright, 
				get_task_ipcspace(current_task()));
	} 
	error = KERN_SUCCESS;

tfpout:
	task_deallocate(t1);
	AUDIT_ARG(mach_port2, tret);
	(void) copyout((char *) &tret, task_addr, sizeof(mach_port_name_t));
	if (p != PROC_NULL)
		proc_rele(p);
	AUDIT_MACH_SYSCALL_EXIT(error);
	return(error);
}
Exemple #5
0
kern_return_t
catch_mach_exception_raise(
        __unused mach_port_t exception_port,
        mach_port_t thread,
        mach_port_t task,
        exception_type_t exception,
        mach_exception_data_t code,
        __unused mach_msg_type_number_t codeCnt
)
{
	task_t			self = current_task();
	thread_t		th_act;
	ipc_port_t 		thread_port;
	struct proc		*p;
	kern_return_t		result = MACH_MSG_SUCCESS;
	int			ux_signal = 0;
	mach_exception_code_t 	ucode = 0;
	struct uthread 		*ut;
	mach_port_name_t thread_name = CAST_MACH_PORT_TO_NAME(thread);
	mach_port_name_t task_name = CAST_MACH_PORT_TO_NAME(task);

	/*
	 *	Convert local thread name to global port.
	 */
   if (MACH_PORT_VALID(thread_name) &&
       (ipc_object_copyin(get_task_ipcspace(self), thread_name,
		       MACH_MSG_TYPE_PORT_SEND,
		       (void *) &thread_port) == MACH_MSG_SUCCESS)) {
        if (IPC_PORT_VALID(thread_port)) {
	   th_act = convert_port_to_thread(thread_port);
	   ipc_port_release(thread_port);
	} else {
	   th_act = THREAD_NULL;
	}

	/*
	 *	Catch bogus ports
	 */
	if (th_act != THREAD_NULL) {

	    /*
	     *	Convert exception to unix signal and code.
	     */
	    ux_exception(exception, code[0], code[1], &ux_signal, &ucode);

	    ut = get_bsdthread_info(th_act);
	    p = proc_findthread(th_act);

	    /* Can't deliver a signal without a bsd process reference */
	    if (p == NULL) {
		    ux_signal = 0;
		    result = KERN_FAILURE;
	    }

	    /*
	     * Stack overflow should result in a SIGSEGV signal
	     * on the alternate stack.
	     * but we have one or more guard pages after the
	     * stack top, so we would get a KERN_PROTECTION_FAILURE
	     * exception instead of KERN_INVALID_ADDRESS, resulting in
	     * a SIGBUS signal.
	     * Detect that situation and select the correct signal.
	     */
	    if (code[0] == KERN_PROTECTION_FAILURE &&
		ux_signal == SIGBUS) {
		    user_addr_t		sp, stack_min, stack_max;
		    int			mask;
		    struct sigacts	*ps;

		    sp = code[1];

		    stack_max = p->user_stack;
		    stack_min = p->user_stack - MAXSSIZ;
		    if (sp >= stack_min &&
			sp < stack_max) {
			    /*
			     * This is indeed a stack overflow.  Deliver a
			     * SIGSEGV signal.
			     */
			    ux_signal = SIGSEGV;

			    /*
			     * If the thread/process is not ready to handle
			     * SIGSEGV on an alternate stack, force-deliver
			     * SIGSEGV with a SIG_DFL handler.
			     */
			    mask = sigmask(ux_signal);
			    ps = p->p_sigacts;
			    if ((p->p_sigignore & mask) ||
				(ut->uu_sigwait & mask) ||
				(ut->uu_sigmask & mask) ||
				(ps->ps_sigact[SIGSEGV] == SIG_IGN) ||
				(! (ps->ps_sigonstack & mask))) {
				    p->p_sigignore &= ~mask;
				    p->p_sigcatch &= ~mask;
				    ps->ps_sigact[SIGSEGV] = SIG_DFL;
				    ut->uu_sigwait &= ~mask;
				    ut->uu_sigmask &= ~mask;
			    }
		    }
	    }
	    /*
	     *	Send signal.
	     */
	    if (ux_signal != 0) {
			ut->uu_exception = exception;
			//ut->uu_code = code[0]; // filled in by threadsignal
			ut->uu_subcode = code[1];			
			threadsignal(th_act, ux_signal, code[0]);
	    }
	    if (p != NULL) 
		    proc_rele(p);
	    thread_deallocate(th_act);
	}
	else
	    result = KERN_INVALID_ARGUMENT;
    }
    else
    	result = KERN_INVALID_ARGUMENT;

    /*
     *	Delete our send rights to the task port.
     */
    (void)mach_port_deallocate(get_task_ipcspace(ux_handler_self), task_name);

    return (result);
}
Exemple #6
0
static
void
ux_handler(void)
{
    task_t		self = current_task();
    mach_port_name_t	exc_port_name;
    mach_port_name_t	exc_set_name;

    /* self->kernel_vm_space = TRUE; */
    ux_handler_self = self;


    /*
     *	Allocate a port set that we will receive on.
     */
    if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_PORT_SET,  &exc_set_name) != MACH_MSG_SUCCESS)
	    panic("ux_handler: port_set_allocate failed");

    /*
     *	Allocate an exception port and use object_copyin to
     *	translate it to the global name.  Put it into the set.
     */
    if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_RECEIVE, &exc_port_name) != MACH_MSG_SUCCESS)
	panic("ux_handler: port_allocate failed");
    if (mach_port_move_member(get_task_ipcspace(ux_handler_self),
    			exc_port_name,  exc_set_name) != MACH_MSG_SUCCESS)
	panic("ux_handler: port_set_add failed");

    if (ipc_object_copyin(get_task_ipcspace(self), exc_port_name,
			MACH_MSG_TYPE_MAKE_SEND, 
			(void *) &ux_exception_port) != MACH_MSG_SUCCESS)
		panic("ux_handler: object_copyin(ux_exception_port) failed");

    proc_list_lock();
    thread_wakeup(&ux_exception_port);
    proc_list_unlock();

    /* Message handling loop. */

    for (;;) {
	struct rep_msg {
		mach_msg_header_t Head;
		NDR_record_t NDR;
		kern_return_t RetCode;
	} rep_msg;
	struct exc_msg {
		mach_msg_header_t Head;
		/* start of the kernel processed data */
		mach_msg_body_t msgh_body;
		mach_msg_port_descriptor_t thread;
		mach_msg_port_descriptor_t task;
		/* end of the kernel processed data */
		NDR_record_t NDR;
		exception_type_t exception;
		mach_msg_type_number_t codeCnt;
		mach_exception_data_t code;
		/* some times RCV_TO_LARGE probs */
		char pad[512];
	} exc_msg;
	mach_port_name_t	reply_port;
	kern_return_t	 result;

	exc_msg.Head.msgh_local_port = CAST_MACH_NAME_TO_PORT(exc_set_name);
	exc_msg.Head.msgh_size = sizeof (exc_msg);
#if 0
	result = mach_msg_receive(&exc_msg.Head);
#else
	result = mach_msg_receive(&exc_msg.Head, MACH_RCV_MSG,
			     sizeof (exc_msg), exc_set_name,
			     MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL,
			     0);
#endif
	if (result == MACH_MSG_SUCCESS) {
	    reply_port = CAST_MACH_PORT_TO_NAME(exc_msg.Head.msgh_remote_port);

	    if (mach_exc_server(&exc_msg.Head, &rep_msg.Head)) {
		result = mach_msg_send(&rep_msg.Head, MACH_SEND_MSG,
			sizeof (rep_msg),MACH_MSG_TIMEOUT_NONE,MACH_PORT_NULL);
		if (reply_port != 0 && result != MACH_MSG_SUCCESS)
			mach_port_deallocate(get_task_ipcspace(ux_handler_self), reply_port);
	    }

	}
	else if (result == MACH_RCV_TOO_LARGE)
		/* ignore oversized messages */;
	else
		panic("exception_handler");
    }
}