diff --git a/sys/cam/cam_xpt.c b/sys/cam/cam_xpt.c
index bc7e7c647388..418e0088e4e4 100644
--- a/sys/cam/cam_xpt.c
+++ b/sys/cam/cam_xpt.c
@@ -26,7 +26,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *      $Id: cam_xpt.c,v 1.1 1998/09/15 06:33:23 gibbs Exp $
+ *      $Id: cam_xpt.c,v 1.2 1998/09/15 22:05:44 gibbs Exp $
  */
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -632,6 +632,12 @@ xptopen(dev_t dev, int flags, int fmt, struct proc *p)
 
 	unit = minor(dev) & 0xff;
 
+	/*
+	 * Only allow read-write access.
+	 */
+	if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
+		return(EPERM);
+
 	/*
 	 * We don't allow nonblocking access.
 	 */
diff --git a/sys/cam/scsi/scsi_pass.c b/sys/cam/scsi/scsi_pass.c
index f16b11ea1f3e..cc29ae408578 100644
--- a/sys/cam/scsi/scsi_pass.c
+++ b/sys/cam/scsi/scsi_pass.c
@@ -24,7 +24,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *      $Id$
+ *      $Id: scsi_pass.c,v 1.1 1998/09/15 06:36:34 gibbs Exp $
  */
 
 #include <sys/param.h>
@@ -389,6 +389,12 @@ passopen(dev_t dev, int flags, int fmt, struct proc *p)
 	if (softc->flags & PASS_FLAG_INVALID)
 		return(ENXIO);
 
+	/*
+	 * Only allow read-write access.
+	 */
+	if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0))
+		return(EPERM);
+
 	/*
 	 * We don't allow nonblocking access.
 	 */