Golang WaitStatus.StopSignal方法代碼示例

func (c *CloneParams) CloneFrozen() (int, error) {
	pid := callClone(c)
	// TODO: clone errors?
	c.CommWriter.Close()
	c.stdhandles.Close()
	c.comm = make(chan CommStatus)
	go commReader(c.CommReader, c.comm)

	var status syscall.WaitStatus
	for {
		wpid, err := syscall.Wait4(pid, &status, 0, nil) // TODO: rusage
		if err != nil {
			return -1, os.NewSyscallError("Wait4", err)
		}
		if wpid == pid {
			break
		}
	}
	if status.Stopped() && status.StopSignal() == syscall.SIGTRAP {
		return pid, nil
	}
	if status.Exited() {
		co, ok := <-c.comm
		if ok {
			return -1, childError(co)
		}
		return -1, fmt.Errorf("DAFUQ")
	}
	err := syscall.Kill(pid, syscall.SIGKILL)
	if err != nil {
		return -1, os.NewSyscallError("Kill", err)
	}
	return -1, fmt.Errorf("traps, signals, dafuq is this")
}

// waitStatusToStateUpdate converts syscall.WaitStatus to a StateUpdate.
func waitStatusToStateUpdate(ws syscall.WaitStatus) *stateUpdate {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return newExitedStateUpdate(ok)
		}
		return newExitedStateUpdate(newFailure(fmt.Sprint(es)))
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return newUnexitedStateUpdate(msg)
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return newUnexitedStateUpdate(msg)
	case ws.Continued():
		return newUnexitedStateUpdate("continued")
	default:
		return newUnexitedStateUpdate(fmt.Sprint("unknown status", ws))
	}
}

func printStatus(ws syscall.WaitStatus) string {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return ""
		}
		return fmt.Sprintf("exited %v", es)
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return msg
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return msg
	case ws.Continued():
		return "continued"
	default:
		return fmt.Sprintf("unknown status %v", ws)
	}
}

func handleSigchld(mpid int) *resultPack {
	for {
		var status syscall.WaitStatus
		var spid int
		var err error
		spid, err = syscall.Wait4(-mpid, &status, syscall.WNOHANG|syscall.WALL, nil)
		if err != nil {
			poePanic(err, "wait4 failed")
		} else if spid == 0 {
			return nil
		}

		if spid == mpid && status.Exited() {
			return &resultPack{POE_SUCCESS, status.ExitStatus(), ""}
		} else if spid == mpid && status.Signaled() {
			return &resultPack{POE_SIGNALED, -1, fmt.Sprintf("Program terminated with signal %d (%s)", int(status.Signal()), status.Signal().String())}
		} else if status.Stopped() {
			e := status >> 16 & 0xff
			switch e {
			case PTRACE_EVENT_SECCOMP:
				if res := handleSyscall(spid); res != nil {
					return res
				}
			case syscall.PTRACE_EVENT_CLONE, syscall.PTRACE_EVENT_FORK, syscall.PTRACE_EVENT_VFORK:
				syscall.PtraceCont(spid, 0)
			default:
				syscall.PtraceCont(spid, int(status.StopSignal()))
			}
		}
	}
}

// waitStatusToError converts syscall.WaitStatus to an Error.
func waitStatusToError(ws syscall.WaitStatus) error {
	switch {
	case ws.Exited():
		es := ws.ExitStatus()
		if es == 0 {
			return nil
		}
		return errors.New(fmt.Sprint(es))
	case ws.Signaled():
		msg := fmt.Sprintf("signaled %v", ws.Signal())
		if ws.CoreDump() {
			msg += " (core dumped)"
		}
		return errors.New(msg)
	case ws.Stopped():
		msg := fmt.Sprintf("stopped %v", ws.StopSignal())
		trap := ws.TrapCause()
		if trap != -1 {
			msg += fmt.Sprintf(" (trapped %v)", trap)
		}
		return errors.New(msg)
	/*
		case ws.Continued():
			return newUnexitedStateUpdate("continued")
	*/
	default:
		return fmt.Errorf("unknown WaitStatus", ws)
	}
}

func ChildWaitingFunc(pid int, sig chan *ChildWaitData) {
	var status syscall.WaitStatus
	var rusage syscall.Rusage
	result := &ChildWaitData{}
	for {
		wpid, err := syscall.Wait4(pid, &status, syscall.WUNTRACED|syscall.WCONTINUED, &rusage)
		if wpid != pid {
			continue
		}

		if status.Exited() {
			result.ExitCode = uint32(status.ExitStatus())
			break
		}
		if status.Stopped() {
			result.SuccessCode |= EF_STOPPED
			result.StopSignal = uint32(status.StopSignal())
			syscall.Kill(pid, syscall.SIGKILL)
		}
		if status.Signaled() {
			result.SuccessCode |= EF_KILLED_BY_OTHER
			result.KillSignal = uint32(status.Signal())
			break
		}
		if err != nil {
			break
		}
	}
	result.RusageCpuUser = time.Nanosecond * time.Duration(rusage.Utime.Nano())
	result.RusageCpuKernel = time.Nanosecond * time.Duration(rusage.Stime.Nano())
	sig <- result
	close(sig)
}

func wait_for_syscall(pid int) (exited bool, err error) {
	var waitStatus syscall.WaitStatus
	for {
		// Entering a syscall
		if err = syscall.PtraceSyscall(pid, 0); err != nil {
			return
		}

		if _, err = syscall.Wait4(pid, &waitStatus, 0, nil); err != nil {
			return
		}

		// Is it for us ?
		if waitStatus.Stopped() && waitStatus.StopSignal()&0x80 == 0x80 {
			return
		}

		if waitStatus.Exited() {
			exited = true
			return
		}
	}
}

func (t *PTracer) handleStopped(pid int, status syscall.WaitStatus) {
	signal := syscall.Signal(0)
	target, err := t.thread(pid)
	if err != nil {
		log.Printf("thread failed: %v", err)
		return
	}

	if !target.attached {
		target.attached = true

		err = syscall.PtraceSetOptions(pid, ptraceOptions)
		if err != nil {
			log.Printf("SetOptions failed, pid=%d, err=%v", pid, err)
			return
		}

	} else if status.Stopped() && status.StopSignal() == syscall.SIGTRAP|ptraceTracesysgoodBit {
		// pid entered Syscall-enter-stop or syscall-exit-stop
		target.syscallStopped()

	} else if status.Stopped() && status.StopSignal() == syscall.SIGTRAP {
		// pid entered PTRACE_EVENT stop
		switch status.TrapCause() {
		case syscall.PTRACE_EVENT_CLONE:
			err := target.handleClone(pid)
			if err != nil {
				log.Printf("clone failed: %v", err)
				return
			}
		default:
			log.Printf("Unknown PTRACE_EVENT %d for pid %d", status.TrapCause(), pid)
		}
	} else if status.Exited() || status.Signaled() {
		// "tracer can safely assume pid will exit"
		t.threadExited(target)
		return
	} else if status.Stopped() {
		// tracee received a non-trace related signal
		signal = status.StopSignal()

		if signal == syscall.SIGSTOP && target.process.detaching {
			t.detachThread(target)
			return
		}
	} else {
		// unknown stop - shouldn't happen!
		log.Printf("Pid %d random stop with status %x", pid, status)
	}

	// Restart stopped caller in syscall trap mode.
	// log.Printf("Restarting pid %d with signal %d", pid, int(signal))
	err = syscall.PtraceSyscall(pid, int(signal))
	if err != nil {
		log.Printf("PtraceSyscall failed, pid=%d, err=%v", pid, err)
	}
}

//.........這裏部分代碼省略.........
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_STOP << 8):
				if *debug == true {
					log.Error("Ptrace stop event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				}
				continue
			case uint32(unix.SIGTRAP):
				if *debug == true {
					log.Error("SIGTRAP detected in pid %v (%s)", pid, getProcessCmdLine(pid))
				}
				continue
			case uint32(unix.SIGCHLD):
				if *debug == true {
					log.Error("SIGCHLD detected pid %v (%s)", pid, getProcessCmdLine(pid))
				}
				continue
			case uint32(unix.SIGSTOP):
				if *debug == true {
					log.Error("SIGSTOP detected pid %v (%s)", pid, getProcessCmdLine(pid))
				}
				continue
			case uint32(unix.SIGSEGV):
				if *debug == true {
					log.Error("SIGSEGV detected pid %v (%s)", pid, getProcessCmdLine(pid))
				}
				err = syscall.Kill(pid, 9)
				if err != nil {
					log.Error("kill: %v", err)
					os.Exit(1)
				}
				delete(children, pid)
				continue
			default:
				y := s.StopSignal()
				if *debug == true {
					log.Error("Child stopped for unknown reasons pid %v status %v signal %i (%s)", pid, s, y, getProcessCmdLine(pid))
				}
				continue
			}
		}

		if train == true {
			var u *user.User
			var e error
			u, e = user.Current()
			var resolvedpath = ""

			if e != nil {
				log.Error("user.Current(): %v", e)
			}

			if *trainingoutput != "" {
				resolvedpath = *trainingoutput
			} else {
				if *noprofile == false {
					resolvedpath, e = fs.ResolvePathNoGlob(p.Seccomp.TrainOutput, u)
					if e != nil {
						log.Error("resolveVars(): %v", e)
					}
				} else {
					s := fmt.Sprintf("${HOME}/%s-%d.seccomp", fname(os.Args[2]), cpid)
					resolvedpath, e = fs.ResolvePathNoGlob(s, u)
				}
			}
			policyout := "execve:1\n"
			for call := range trainingset {

//.........這裏部分代碼省略.........
			syscall.PtraceCont(pid, 0)
			pid, err = syscall.Wait4(-1, &s, syscall.WALL, nil)
			if err != nil {
				log.Error("Error (wait4) here: %v %i %v\n", err, pid, children)
				if len(children) == 0 {
					done = true
				}
				continue
			}
			children[pid] = true
			if s.Exited() == true {
				delete(children, pid)
				log.Info("Child pid %v finished.\n", pid)
				if len(children) == 0 {
					done = true
				}
				continue
			}
			if s.Signaled() == true {
				log.Error("Other pid signalled %v %v", pid, s)
				delete(children, pid)
				continue
			}
			switch uint32(s) >> 8 {

			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_SECCOMP << 8):
				if err != nil {
					log.Error("Error (ptrace): %v", err)
					continue
				}
				var regs syscall.PtraceRegs
				err = syscall.PtraceGetRegs(pid, &regs)

				if err != nil {
					log.Error("Error (ptrace): %v", err)
				}

				systemcall, err := syscallByNum(getSyscallNumber(regs))
				if err != nil {
					log.Error("Error: %v", err)
					continue
				}

				/* Render the system call invocation */

				r := getSyscallRegisterArgs(regs)
				call := ""

				if f, ok := renderFunctions[getSyscallNumber(regs)]; ok {
					call, err = f(pid, r)
					if err != nil {
						log.Info("%v", err)
						continue
					}
				} else {
					call = renderSyscallBasic(pid, systemcall, regs)
				}

				log.Info("==============================================\nseccomp hit on sandbox pid %v (%v) syscall %v (%v):\n\n%s\nI ==============================================\n\n", pid, getProcessCmdLine(pid), systemcall.name, systemcall.num, call)
				continue

			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_EXIT << 8):
				log.Error("Ptrace exit event detected pid %v (%s)", pid, getProcessCmdLine(pid))

			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_CLONE << 8):
				log.Error("Ptrace clone event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_FORK << 8):
				log.Error("PTrace fork event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_VFORK << 8):
				log.Error("Ptrace vfork event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_VFORK_DONE << 8):
				log.Error("Ptrace vfork done event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_EXEC << 8):
				log.Error("Ptrace exec event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP) | (unix.PTRACE_EVENT_STOP << 8):
				log.Error("Ptrace stop event detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGTRAP):
				log.Error("SIGTRAP detected in pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGCHLD):
				log.Error("SIGCHLD detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			case uint32(unix.SIGSTOP):
				log.Error("SIGSTOP detected pid %v (%s)", pid, getProcessCmdLine(pid))
				continue
			default:
				y := s.StopSignal()
				log.Error("Child stopped for unknown reasons pid %v status %v signal %i (%s)", pid, s, y, getProcessCmdLine(pid))
				continue
			}
		}
	}

}