[src/trunk]: src/sys/compat/netbsd32 In netbsd32___mount50() zero out the nat...

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

details:   https://anonhg.NetBSD.org/src/rev/6657388dc747
branches:  trunk
changeset: 952745:6657388dc747
user:      simonb <simonb%NetBSD.org@localhost>
date:      Tue Feb 16 14:47:20 2021 +0000

description:
In netbsd32___mount50() zero out the native fs_args union before use so
we don't pass stack garbage to the lower layers in the MNT_GETARGS case.

Fixes random errors like "Bad address" from "mount -vv" with nfs mounts.

diffstat:

 sys/compat/netbsd32/netbsd32_fs.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r e3ce2393b769 -r 6657388dc747 sys/compat/netbsd32/netbsd32_fs.c
--- a/sys/compat/netbsd32/netbsd32_fs.c Tue Feb 16 14:44:25 2021 +0000
+++ b/sys/compat/netbsd32/netbsd32_fs.c Tue Feb 16 14:47:20 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: netbsd32_fs.c,v 1.92 2021/01/19 03:41:22 simonb Exp $  */
+/*     $NetBSD: netbsd32_fs.c,v 1.93 2021/02/16 14:47:20 simonb Exp $  */
 
 /*
  * Copyright (c) 1998, 2001 Matthew R. Green
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: netbsd32_fs.c,v 1.92 2021/01/19 03:41:22 simonb Exp $");
+__KERNEL_RCSID(0, "$NetBSD: netbsd32_fs.c,v 1.93 2021/02/16 14:47:20 simonb Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -825,6 +825,7 @@
  
        udata = data = SCARG_P32(uap, data);
        memset(&fs_args32, 0, sizeof(fs_args32));
+       memset(&fs_args, 0, sizeof(fs_args));
 
        error = copyinstr(type, mtype, sizeof(mtype), &len);
        if (error)