示例#1
0
文件: trap.c 项目: Nukem9/Dune
static long dune_clone(struct dune_tf *tf)
{
	unsigned long fs;
	int rc;
	unsigned long pc;

	rdmsrl(MSR_GS_BASE, pc);

	if (ARG1(tf) != 0)
		return dune_pthread_create(tf);

	fs = dune_get_user_fs();

	rc = syscall(SYS_clone, ARG0(tf), ARG1(tf), ARG2(tf), ARG3(tf),
		     ARG4(tf));

	if (rc < 0)
		return -errno;

	if (rc == 0) {
		dune_enter();
		dune_set_user_fs(fs);
	}

	return rc;
}
示例#2
0
文件: trap.c 项目: bernardgut/ix-1
void *pthread_entry(void *arg)
{
	struct thread_arg *a = arg;
	struct dune_tf *tf = a->ta_tf;
	struct dune_tf child_tf;
	int *tidp = NULL;
	pid_t tid;
	int flags = ARG0(tf);

	if (!a->dune_started)
		dune_enter();

	tid = syscall(SYS_gettid);

	/* XXX validate */
	/* set up tls */
	if (flags & CLONE_SETTLS)
		dune_set_user_fs(ARG4(tf));

	if (flags & CLONE_PARENT_SETTID) {
		tidp = (int *) ARG2(tf);
		*tidp = tid;
	}

	if (flags & CLONE_CHILD_CLEARTID) {
		tidp = (int *) ARG3(tf);
		syscall(SYS_set_tid_address, tidp);
	}

	/* enter thread */
	memcpy(&child_tf, tf, sizeof(child_tf));
	child_tf.rip = tf->rip;
	child_tf.rax = 0;
	child_tf.rsp = ARG1(tf);

	/* tell parent tid */
	pthread_mutex_lock(&a->ta_mtx);
	a->ta_tid = tid;
	pthread_mutex_unlock(&a->ta_mtx);
	pthread_cond_signal(&a->ta_cnd);

	do_enter_thread(&child_tf);

	return NULL;
}
示例#3
0
文件: trap.c 项目: Nukem9/Dune
static void syscall_do_foreal(struct dune_tf *tf)
{
	switch (tf->rax) {
	case SYS_arch_prctl:
		switch (ARG0(tf)) {
		case ARCH_GET_FS:
			*((unsigned long*) ARG1(tf)) = dune_get_user_fs();
			tf->rax = 0;
			break;

		case ARCH_SET_FS:
			dune_set_user_fs(ARG1(tf));
			tf->rax = 0;
			break;

		default:
			tf->rax = -EINVAL;
			break;
		}
		break;

	case SYS_brk:
		tf->rax = umm_brk((unsigned long) ARG0(tf));
		break;

	case SYS_mmap:
		tf->rax = (unsigned long) umm_mmap((void *) ARG0(tf),
			(size_t) ARG1(tf), (int) ARG2(tf), (int) ARG3(tf),
			(int) ARG4(tf), (off_t) ARG5(tf));
		break;

	case SYS_mprotect:
		tf->rax = umm_mprotect((void *) ARG0(tf),
				       (size_t) ARG1(tf),
				       ARG2(tf));
		break;

	case SYS_munmap:
		tf->rax = umm_munmap((void *) ARG0(tf), (size_t) ARG1(tf)); 
		break;

	case SYS_mremap:
		tf->rax = (unsigned long) umm_mremap((void*) ARG0(tf),
				(size_t) ARG1(tf), (size_t) ARG2(tf),
				(int) ARG3(tf), (void*) ARG4(tf));
		break;

	case SYS_shmat:
		tf->rax = (unsigned long) umm_shmat((int) ARG0(tf),
				(void*) ARG1(tf), (int) ARG2(tf));
		break;

	case SYS_clone:
		tf->rax = dune_clone(tf);
		break;

        case SYS_execve:
                tf->rax = exec_execev((const char *)ARG0(tf),
                                      (char **const)ARG1(tf),
                                      (char **const)ARG2(tf));
                break;


	/* ignore signals for now */
	case SYS_rt_sigaction:
	case SYS_rt_sigprocmask:
		tf->rax = 0;
		break;

	case SYS_sigaltstack:
	case SYS_signalfd:
	case SYS_signalfd4:
	case SYS_rt_sigpending:
	case SYS_rt_sigreturn:
	case SYS_rt_sigsuspend:
	case SYS_rt_sigqueueinfo:
	case SYS_rt_sigtimedwait:
		tf->rax = -ENOSYS;
		break;

	case SYS_exit_group:
	case SYS_exit:
		dune_ret_from_user(ARG0(tf));
		break;

	default:
		dune_passthrough_syscall(tf);
		break;
	}
}
示例#4
0
文件: trap.c 项目: Nukem9/Dune
static int syscall_check_params(struct dune_tf *tf)
{
	void *ptr = NULL;
	uint64_t len = 0;
	char *str = NULL;
	int err = 0;

	switch (tf->rax) {
	case SYS_uname:
		ptr = (void*) ARG0(tf);
		len = sizeof(struct utsname);
		break;

	case SYS_arch_prctl:
		if (ARG0(tf) == ARCH_GET_FS) {
			ptr = (void*) ARG1(tf);
			len = sizeof(unsigned long);
		}
		break;

	case SYS_access:
	case SYS_open:
	case SYS_unlink:
		str = (char*) ARG0(tf);
		break;

	case SYS_openat:
		str = (char*) ARG1(tf);
		break;

	case SYS_getdents:
	case SYS_read:
	case SYS_write:
	case SYS_connect:
	case SYS_bind:
		ptr = (void*) ARG1(tf);
		len = ARG2(tf);
		break;

	case SYS_writev:
	case SYS_readv:
		err = check_iovec((struct iovec*) ARG1(tf), ARG2(tf));
		break;

	case SYS_stat:
	case SYS_lstat:
		str = (char*) ARG0(tf);
	case SYS_fstat:
		ptr = (void*) ARG1(tf);
		len = sizeof(struct stat);
		break;

	case SYS_statfs:
		str = (char*) ARG0(tf);
		ptr = (void*) ARG1(tf);
		len = sizeof(struct statfs);
		break;

	case SYS_time:
		ptr = (void*) ARG0(tf);
		len = sizeof(time_t);
		break;

	case SYS_epoll_ctl:
		ptr = (void*) ARG3(tf);
		len = sizeof(struct epoll_event);
		break;

	case SYS_epoll_wait:
		ptr = (void*) ARG1(tf);
		len = ARG2(tf) * sizeof(struct epoll_event);
		break;

	case SYS_setsockopt:
		ptr = (void*) ARG3(tf);
		len = ARG4(tf);
		break;

	case SYS_accept:
		if (ARG2(tf)) {
			socklen_t *l = (socklen_t*) ARG2(tf);

			if (check_extent(l, sizeof(*l)))
				err = -EFAULT;
			else {
				len = *l;
				ptr = (void*) ARG1(tf);
				assert(ptr);
			}
		}
		break;

	case SYS_fcntl:
		switch (ARG1(tf)) {
		case F_DUPFD:
		case F_DUPFD_CLOEXEC:
		case F_GETFD:
		case F_SETFD:
		case F_GETFL:
		case F_SETFL:
		case F_GETOWN:
		case F_SETOWN:
			break;

		case F_SETLKW:
		case F_GETLK:
		case F_SETLK:
			ptr = (void*) ARG2(tf);
			len = sizeof(struct flock);
			break;

		default:
			err = -EFAULT;
			break;
		}
		break;

	case SYS_ioctl:
		/* XXX unreliable */
		if (_IOC_DIR(ARG1(tf))) {
			ptr = (void*) ARG2(tf);
			len = _IOC_SIZE(ARG1(tf));
		}
		break;

	case SYS_setgroups:
		ptr = (void*) ARG1(tf);
		len = sizeof(gid_t) * ARG0(tf);
		break;

	case SYS_rt_sigaction:
		ptr = (void*) ARG1(tf);
		len = sizeof(struct sigaction);

		if (ARG2(tf)) {
			if (check_extent((void*) ARG2(tf), len)) {
				tf->rax = -EFAULT;
				return -1;
			}
		}
		break;
	case SYS_sigaltstack:
	case SYS_signalfd:
	case SYS_signalfd4:
		ptr = (void*) ARG1(tf);
		len = sizeof(sigset_t);
		break;
	case SYS_rt_sigpending:
		ptr = (void*) ARG0(tf);
		len = sizeof(sigset_t);
		break;
	case SYS_rt_sigprocmask:
		if (ARG1(tf)) {
			ptr = (void*) ARG1(tf);
			len = sizeof(sigset_t);
		}
		if (ARG2(tf)) {
			if (check_extent((void*) ARG2(tf), sizeof(sigset_t))) {
				tf->rax = -EFAULT;
				return -1;
			}
		}
		break;
	case SYS_rt_sigreturn:
		break;
	case SYS_rt_sigsuspend:
		ptr = (void*) ARG0(tf);
		len = sizeof(sigset_t);
		break;
	case SYS_rt_sigqueueinfo:
		ptr = (void*) ARG1(tf);
		len = sizeof(siginfo_t);
		break;
	case SYS_rt_sigtimedwait:
		if (check_extent((void*) ARG0(tf), sizeof(siginfo_t))) {
			tf->rax = -EFAULT;
			return -1;
		}
		if (check_extent((void*) ARG1(tf), sizeof(siginfo_t))) {
			tf->rax = -EFAULT;
			return -1;
		}
		if (ARG2(tf)) {
			if (check_extent((void*) ARG2(tf), sizeof(struct timespec))) {
				tf->rax = -EFAULT;
				return -1;
			}
		}
		break;

	/* umm_ checks for correctness */
	case SYS_brk:
		break;

	case SYS_mprotect:
	case SYS_munmap:
	case SYS_mmap:
//		ptr = (void*) ARG0(tf);
//		len = ARG1(tf);
		break;

	case SYS_getcwd:
		ptr = (void*) ARG0(tf);
		len = ARG1(tf);
		break;

	case SYS_getrlimit:
		ptr = (void*) ARG1(tf);
		len = sizeof(struct rlimit);
		break;

	case SYS_sendfile:
		ptr = (void*) ARG2(tf);
		len = sizeof(off_t);
		break;

	case SYS_getuid:
	case SYS_setuid:
	case SYS_getgid:
	case SYS_setgid:
	case SYS_getpid:
	case SYS_epoll_create:
	case SYS_dup2:
	case SYS_socket:
	case SYS_shutdown:
	case SYS_listen:
	case SYS_lseek:
		break;

	/* XXX - doesn't belong here */
	case SYS_close:
		if (ARG0(tf) < 3) {
			tf->rax = 0;
			return -1;
		}
		break;

	case SYS_execve:
	{
                char *p = (char*)ARG0(tf);
                
                if (check_string(p)) {
                        err = -EFAULT;
                        break;
                }

                // XXX: Check arrays

		break;
	}

	default:
#if 0
		{
			static FILE *_out;

			if (!_out)
				_out = fopen("/tmp/syscall.log", "w");

			fprintf(_out, "Syscall %d\n", tf->rax);
			fflush(_out);
		}
#endif
		break;
	}

	if (ptr != NULL && len != 0 && check_extent(ptr, len))
		err = -EFAULT;

	if (str != NULL && check_string(str))
		err = -EFAULT;

	if (err) {
		tf->rax = err;
		return -1;
	}

	return 0;
}