Missing critical region locks.

---
 hurd/hurd/fd.h              |    2 ++
 sysdeps/mach/hurd/dirfd.c   |    3 +++
 sysdeps/mach/hurd/opendir.c |    2 ++
 3 files changed, 7 insertions(+)

--- a/hurd/hurd/fd.h
+++ b/hurd/hurd/fd.h
@@ -68,6 +68,7 @@
 {
   struct hurd_fd *descriptor;
 
+  HURD_CRITICAL_BEGIN;
   __mutex_lock (&_hurd_dtable_lock);
   if (fd < 0 || fd >= _hurd_dtablesize)
     descriptor = NULL;
@@ -90,6 +91,7 @@
 	}
     }
   __mutex_unlock (&_hurd_dtable_lock);
+  HURD_CRITICAL_END;
 
   return descriptor;
 }
--- a/sysdeps/mach/hurd/dirfd.c
+++ b/sysdeps/mach/hurd/dirfd.c
@@ -26,6 +26,8 @@
 dirfd (DIR *dirp)
 {
   int fd;
+
+  HURD_CRITICAL_BEGIN;
   __mutex_lock (&_hurd_dtable_lock);
   for (fd = 0; fd < _hurd_dtablesize; ++fd)
     if (_hurd_dtable[fd] == dirp->__fd)
@@ -36,6 +38,7 @@
       fd = -1;
     }
   __mutex_unlock (&_hurd_dtable_lock);
+  HURD_CRITICAL_END;
 
   return fd;
 }
--- a/sysdeps/mach/hurd/opendir.c
+++ b/sysdeps/mach/hurd/opendir.c
@@ -51,9 +51,11 @@
     return NULL;
 
   /* Set the descriptor to close on exec. */
+  HURD_CRITICAL_BEGIN;
   __spin_lock (&d->port.lock);
   d->flags |= FD_CLOEXEC;
   __spin_unlock (&d->port.lock);
+  HURD_CRITICAL_END;
 
   dirp->__fd = d;
   dirp->__data = dirp->__ptr = NULL;