[src/netbsd-8]: src/sys/kern Pull up following revision(s) (requested by maxv...

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

details:   https://anonhg.NetBSD.org/src/rev/26a947447349
branches:  netbsd-8
changeset: 445771:26a947447349
user:      martin <martin%NetBSD.org@localhost>
date:      Mon Nov 12 08:56:15 2018 +0000

description:
Pull up following revision(s) (requested by maxv in ticket #1088):

        sys/kern/kern_proc.c: revision 1.219 (via patch)

Fix buffer overflow, which can lead to severe information leak. Detected
by kASan.

diffstat:

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

diffs (28 lines):

diff -r 249570b4a29b -r 26a947447349 sys/kern/kern_proc.c
--- a/sys/kern/kern_proc.c      Mon Nov 12 08:50:18 2018 +0000
+++ b/sys/kern/kern_proc.c      Mon Nov 12 08:56:15 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_proc.c,v 1.206.6.4 2018/04/16 13:31:33 martin Exp $       */
+/*     $NetBSD: kern_proc.c,v 1.206.6.5 2018/11/12 08:56:15 martin Exp $       */
 
 /*-
  * Copyright (c) 1999, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -62,7 +62,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.206.6.4 2018/04/16 13:31:33 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_proc.c,v 1.206.6.5 2018/11/12 08:56:15 martin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_kstack.h"
@@ -2461,7 +2461,8 @@
 
        len = strlen(path) + 1;
        if (oldp != NULL) {
-               error = sysctl_copyout(l, path, oldp, *oldlenp);
+               size_t copylen = min(len, *oldlenp);
+               error = sysctl_copyout(l, path, oldp, copylen);
                if (error == 0 && *oldlenp < len)
                        error = ENOSPC;
        }