[src/trunk]: src/sys/uvm Make break(2) reject high adresses that wrap to 0 af...

[njoly <njoly%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/510ea13eb961
branches:  trunk
changeset: 749349:510ea13eb961
user:      njoly <njoly%NetBSD.org@localhost>
date:      Fri Nov 27 12:25:10 2009 +0000

description:
Make break(2) reject high adresses that wrap to 0 after page rounding.

diffstat:

 sys/uvm/uvm_unix.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r 3c7f36ed5451 -r 510ea13eb961 sys/uvm/uvm_unix.c
--- a/sys/uvm/uvm_unix.c        Fri Nov 27 11:44:36 2009 +0000
+++ b/sys/uvm/uvm_unix.c        Fri Nov 27 12:25:10 2009 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_unix.c,v 1.41 2009/03/04 21:52:38 christos Exp $   */
+/*     $NetBSD: uvm_unix.c,v 1.42 2009/11/27 12:25:10 njoly Exp $      */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -50,7 +50,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.41 2009/03/04 21:52:38 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.42 2009/11/27 12:25:10 njoly Exp $");
 
 #include "opt_pax.h"
 
@@ -86,7 +86,8 @@
        mutex_enter(&p->p_auxlock);
        old = (vaddr_t)vm->vm_daddr;
        new = round_page((vaddr_t)SCARG(uap, nsize));
-       if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old) {
+       if (new == 0 ||
+           ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old)) {
                mutex_exit(&p->p_auxlock);
                return (ENOMEM);
        }