[src/trunk]: src/sys/kern Add sanity check to sysctl_kern_maxvnodes.

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

details:   https://anonhg.NetBSD.org/src/rev/31b0dacd222b
branches:  trunk
changeset: 781829:31b0dacd222b
user:      mlelstv <mlelstv%NetBSD.org@localhost>
date:      Wed Oct 03 07:22:59 2012 +0000

description:
Add sanity check to sysctl_kern_maxvnodes.

diffstat:

 sys/kern/init_sysctl.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r 586090b9364f -r 31b0dacd222b sys/kern/init_sysctl.c
--- a/sys/kern/init_sysctl.c    Wed Oct 03 07:20:50 2012 +0000
+++ b/sys/kern/init_sysctl.c    Wed Oct 03 07:22:59 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: init_sysctl.c,v 1.190 2012/06/02 21:36:46 dsl Exp $ */
+/*     $NetBSD: init_sysctl.c,v 1.191 2012/10/03 07:22:59 mlelstv Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: init_sysctl.c,v 1.190 2012/06/02 21:36:46 dsl Exp $");
+__KERNEL_RCSID(0, "$NetBSD: init_sysctl.c,v 1.191 2012/10/03 07:22:59 mlelstv Exp $");
 
 #include "opt_sysv.h"
 #include "opt_compat_netbsd.h"
@@ -968,6 +968,13 @@
        if (error || newp == NULL)
                return (error);
 
+       /*
+        * sysctl passes down unsigned values, require them
+        * to be positive
+        */
+       if (new_vnodes <= 0)
+               return (EINVAL);
+
        /* Limits: 75% of KVA and physical memory. */
        new_max = calc_cache_size(kernel_map, 75, 75) / VNODE_COST;
        if (new_vnodes > new_max)