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

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

details:   https://anonhg.NetBSD.org/src/rev/8530105f7e61
branches:  netbsd-8
changeset: 850920:8530105f7e61
user:      snj <snj%NetBSD.org@localhost>
date:      Wed Aug 09 05:14:20 2017 +0000

description:
Pull up following revision(s) (requested by spz in ticket #194):
        sys/kern/kern_ktrace.c: revision 1.171
Clamp the length we use, not the length we don't.
Avoids uninitialized memory disclosure to userland.
>From Ilja Van Sprundel.

diffstat:

 sys/kern/kern_ktrace.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r a0b0c7eed581 -r 8530105f7e61 sys/kern/kern_ktrace.c
--- a/sys/kern/kern_ktrace.c    Wed Aug 09 05:12:18 2017 +0000
+++ b/sys/kern/kern_ktrace.c    Wed Aug 09 05:14:20 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_ktrace.c,v 1.170 2017/06/01 02:45:13 chs Exp $    */
+/*     $NetBSD: kern_ktrace.c,v 1.170.2.1 2017/08/09 05:14:20 snj Exp $        */
 
 /*-
  * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_ktrace.c,v 1.170 2017/06/01 02:45:13 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_ktrace.c,v 1.170.2.1 2017/08/09 05:14:20 snj Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -926,7 +926,7 @@
 
        user_dta = (void *)(ktp + 1);
        if ((error = copyin(addr, user_dta, len)) != 0)
-               len = 0;
+               kte->kte_kth.ktr_len = 0;
 
        ktraddentry(l, kte, KTA_WAITOK);
        return error;