From: deraadt <deraadt@openbsd.org>
Date: Thu, 30 Nov 1995 22:52:05 +0000 (+0000)
Subject: prevent access to page 0 of virtual space
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=f7daf2579bfe9421813cc4ae251f83d343916090;p=openbsd

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 4330f7a459f..ad1173a50b6 100644
--- 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;