prevent access to page 0 of virtual space

diff --git a/sys/arch/mvme68k/mvme68k/mem.c b/sys/arch/mvme68k/mvme68k/mem.c
index 4330f7a..ad1173a 100644 (file)
--- a/sys/arch/mvme68k/mvme68k/mem.c
+++ b/sys/arch/mvme68k/mvme68k/mem.c
@@ -1,4 +1,4 @@
-/*     $Id: mem.c,v 1.2 1995/11/07 08:50:22 deraadt Exp $ */
+/*     $Id: mem.c,v 1.3 1995/11/30 22:52:05 deraadt Exp $ */
 
 /*
  * Copyright (c) 1995 Theo de Raadt
@@ -169,6 +169,8 @@ mmrw(dev, uio, flags)
                        if (!kernacc((caddr_t)v, c,
                            uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
                                return (EFAULT);
+                       if (v < NBPG)
+                               return (EFAULT);
                        error = uiomove((caddr_t)v, c, uio);
                        continue;