[src/trunk]: src/sys/kern Fix info leak. The padding of 'sigact' is not initi...

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

details:   https://anonhg.NetBSD.org/src/rev/c014bd2596e8
branches:  trunk
changeset: 1000089:c014bd2596e8
user:      maxv <maxv%NetBSD.org@localhost>
date:      Fri Jul 05 17:14:48 2019 +0000

description:
Fix info leak. The padding of 'sigact' is not initialized, it gets copied
in the proc, and can later be obtained by userland.

diffstat:

 sys/kern/kern_exec.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 0373e4c6f9e1 -r c014bd2596e8 sys/kern/kern_exec.c
--- a/sys/kern/kern_exec.c      Fri Jul 05 17:08:55 2019 +0000
+++ b/sys/kern/kern_exec.c      Fri Jul 05 17:14:48 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_exec.c,v 1.477 2019/06/27 19:56:10 maxv Exp $     */
+/*     $NetBSD: kern_exec.c,v 1.478 2019/07/05 17:14:48 maxv Exp $     */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -59,7 +59,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.477 2019/06/27 19:56:10 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_exec.c,v 1.478 2019/07/05 17:14:48 maxv Exp $");
 
 #include "opt_exec.h"
 #include "opt_execfmt.h"
@@ -2074,6 +2074,7 @@
        /* handle posix_spawnattr */
        if (spawn_data->sed_attrs != NULL) {
                struct sigaction sigact;
+               memset(&sigact, 0, sizeof(sigact));
                sigact._sa_u._sa_handler = SIG_DFL;
                sigact.sa_flags = 0;