コード例 #1
0
static int
sysctl_settfp_policy(__unused struct sysctl_oid *oidp, void *arg1,
    __unused int arg2, struct sysctl_req *req)
{
    int error = 0;
	int new_value;

    error = SYSCTL_OUT(req, arg1, sizeof(int));
    if (error || req->newptr == USER_ADDR_NULL)
        return(error);

	if (!is_suser())
		return(EPERM);

	if ((error = SYSCTL_IN(req, &new_value, sizeof(int)))) {
		goto out;
	}
	if ((new_value == KERN_TFP_POLICY_DENY) 
		|| (new_value == KERN_TFP_POLICY_DEFAULT))
			tfp_policy = new_value;
	else
			error = EINVAL;		
out:
    return(error);

}
コード例 #2
0
int
ptrace(struct proc *p, struct ptrace_args *uap, register_t *retval)
{
	struct proc *t = current_proc();	/* target process */
	task_t		task;
	thread_t	th_act;
	struct uthread 	*ut;
	int tr_sigexc = 0;
	int error = 0;
	int stopped = 0;

	AUDIT_ARG(cmd, uap->req);
	AUDIT_ARG(pid, uap->pid);
	AUDIT_ARG(addr, uap->addr);
	AUDIT_ARG(value, uap->data);

	if (uap->req == PT_DENY_ATTACH) {
		proc_lock(p);
		if (ISSET(p->p_lflag, P_LTRACED)) {
			proc_unlock(p);
			exit1(p, W_EXITCODE(ENOTSUP, 0), retval);
			/* drop funnel before we return */
			thread_exception_return();
			/* NOTREACHED */
		}
		SET(p->p_lflag, P_LNOATTACH);
		proc_unlock(p);

		return(0);
	}

	if (uap->req == PT_FORCEQUOTA) {
		if (is_suser()) {
			OSBitOrAtomic(P_FORCEQUOTA, (UInt32 *)&t->p_flag);
			return (0);
		} else
			return (EPERM);
	}

	/*
	 *	Intercept and deal with "please trace me" request.
	 */	 
	if (uap->req == PT_TRACE_ME) {
		proc_lock(p);
		SET(p->p_lflag, P_LTRACED);
		/* Non-attached case, our tracer is our parent. */
		p->p_oppid = p->p_ppid;
		proc_unlock(p);
		return(0);
	}
	if (uap->req == PT_SIGEXC) {
		proc_lock(p);
		if (ISSET(p->p_lflag, P_LTRACED)) {
			SET(p->p_lflag, P_LSIGEXC);
			proc_unlock(p);
			return(0);
		} else {
			proc_unlock(p);
			return(EINVAL);
		}
	}

	/* 
	 * We do not want ptrace to do anything with kernel or launchd 
	 */
	if (uap->pid < 2) {
		return(EPERM);
	}

	/*
	 *	Locate victim, and make sure it is traceable.
	 */
	if ((t = proc_find(uap->pid)) == NULL)
			return (ESRCH);

	AUDIT_ARG(process, t);

	task = t->task;
	if (uap->req == PT_ATTACHEXC) {
		uap->req = PT_ATTACH;
		tr_sigexc = 1;
	}
	if (uap->req == PT_ATTACH) {
		int		err;
		
		if ( kauth_authorize_process(proc_ucred(p), KAUTH_PROCESS_CANTRACE, 
									 t, (uintptr_t)&err, 0, 0) == 0 ) {
			/* it's OK to attach */
			proc_lock(t);
			SET(t->p_lflag, P_LTRACED);
			if (tr_sigexc) 
				SET(t->p_lflag, P_LSIGEXC);
	
			t->p_oppid = t->p_ppid;
			proc_unlock(t);
			if (t->p_pptr != p)
				proc_reparentlocked(t, p, 1, 0);
	
			proc_lock(t);
			if (get_task_userstop(task) > 0 ) {
				stopped = 1;
			}
			t->p_xstat = 0;
			proc_unlock(t);
			psignal(t, SIGSTOP);
			/*
			 * If the process was stopped, wake up and run through
			 * issignal() again to properly connect to the tracing
			 * process.
			 */
			if (stopped)
				task_resume(task);       
			error = 0;
			goto out;
		}
		else {
			/* not allowed to attach, proper error code returned by kauth_authorize_process */
			if (ISSET(t->p_lflag, P_LNOATTACH)) {
				psignal(p, SIGSEGV);
			}
			
			error = err;
			goto out;
		}
	}

	/*
	 * You can't do what you want to the process if:
	 *	(1) It's not being traced at all,
	 */
	proc_lock(t);
	if (!ISSET(t->p_lflag, P_LTRACED)) {
		proc_unlock(t);
		error = EPERM;
		goto out;
	}

	/*
	 *	(2) it's not being traced by _you_, or
	 */
	if (t->p_pptr != p) {
		proc_unlock(t);
		error = EBUSY;
		goto out;
	}

	/*
	 *	(3) it's not currently stopped.
	 */
	if (t->p_stat != SSTOP) {
		proc_unlock(t);
		error = EBUSY;
		goto out;
	}

	/*
	 *	Mach version of ptrace executes request directly here,
	 *	thus simplifying the interaction of ptrace and signals.
	 */
	/* proc lock is held here */
	switch (uap->req) {

	case PT_DETACH:
		if (t->p_oppid != t->p_ppid) {
			struct proc *pp;

			proc_unlock(t);
			pp = proc_find(t->p_oppid);
			proc_reparentlocked(t, pp ? pp : initproc, 1, 0);
			if (pp != PROC_NULL)
				proc_rele(pp);
			proc_lock(t);
			
		}

		t->p_oppid = 0;
		CLR(t->p_lflag, P_LTRACED);
		CLR(t->p_lflag, P_LSIGEXC);
		proc_unlock(t);
		goto resume;
		
	case PT_KILL:
		/*
		 *	Tell child process to kill itself after it
		 *	is resumed by adding NSIG to p_cursig. [see issig]
		 */
		proc_unlock(t);
		psignal(t, SIGKILL);
		goto resume;

	case PT_STEP:			/* single step the child */
	case PT_CONTINUE:		/* continue the child */
		proc_unlock(t);
		th_act = (thread_t)get_firstthread(task);
		if (th_act == THREAD_NULL) {
			error = EINVAL;
			goto out;
		}

		if (uap->addr != (user_addr_t)1) {
#if defined(ppc)
#define ALIGNED(addr,size)	(((unsigned)(addr)&((size)-1))==0)
			if (!ALIGNED((int)uap->addr, sizeof(int)))
				return (ERESTART);
#undef 	ALIGNED
#endif
			thread_setentrypoint(th_act, uap->addr);
		}

		if ((unsigned)uap->data >= NSIG) {
			error = EINVAL;
			goto out;
		}

		if (uap->data != 0) {
			psignal(t, uap->data);
                }

		if (uap->req == PT_STEP) {
		        /*
			 * set trace bit
			 */
			if (thread_setsinglestep(th_act, 1) != KERN_SUCCESS) {
				error = ENOTSUP;
				goto out;
			}
		} else {
		        /*
			 * clear trace bit if on
			 */
			if (thread_setsinglestep(th_act, 0) != KERN_SUCCESS) {
				error = ENOTSUP;
				goto out;
			}
		}	
	resume:
		proc_lock(t);
		t->p_xstat = uap->data;
		t->p_stat = SRUN;
		if (t->sigwait) {
			wakeup((caddr_t)&(t->sigwait));
			proc_unlock(t);
			if ((t->p_lflag & P_LSIGEXC) == 0) {
				task_resume(task);
			}
		} else
			proc_unlock(t);
			
		break;
		
	case PT_THUPDATE:  {
		proc_unlock(t);
		if ((unsigned)uap->data >= NSIG) {
			error = EINVAL;
			goto out;
		}
		th_act = port_name_to_thread(CAST_DOWN(mach_port_name_t, uap->addr));
		if (th_act == THREAD_NULL)
			return (ESRCH);
		ut = (uthread_t)get_bsdthread_info(th_act);
		if (uap->data)
			ut->uu_siglist |= sigmask(uap->data);
		proc_lock(t);
		t->p_xstat = uap->data;
		t->p_stat = SRUN;
		proc_unlock(t);
		thread_deallocate(th_act);
		error = 0;
		}
		break;
	default:
		proc_unlock(t);
		error = EINVAL;
		goto out;
	}

	error = 0;
out:
	proc_rele(t);
	return(error);
}