From 0234691abb87288f099114a76a3691edb0404a34 Mon Sep 17 00:00:00 2001
From: uebayasi <uebayasi@openbsd.org>
Date: Tue, 19 Aug 2014 10:01:50 +0000
Subject: [PATCH] ld.so(1): Missing stack var initialization

Explicitly zero-clear stack array to read dynamic segments.  This code has
been working because stack is mapped as anon and zero'ed right after execve(2).

Found by work-in-progress Valgrind port for OpenBSD/amd64.

OK millert@ guenther@
---
 libexec/ld.so/boot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libexec/ld.so/boot.c b/libexec/ld.so/boot.c
index 5c2843e5b5f..536f4f593b3 100644
--- a/libexec/ld.so/boot.c
+++ b/libexec/ld.so/boot.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: boot.c,v 1.2 2014/07/06 17:33:10 otto Exp $ */
+/*	$OpenBSD: boot.c,v 1.3 2014/08/19 10:01:50 uebayasi Exp $ */
 
 /*
  * Copyright (c) 1998 Per Fogelstrom, Opsycon AB
@@ -115,6 +115,7 @@ _dl_boot_bind(const long sp, long *dl_data, Elf_Dyn *dynamicp)
 #else
 	dynp = (Elf_Dyn *)((long)_DYNAMIC + loff);
 #endif
+	_dl_memset(dynld.Dyn.info, 0, sizeof(dynld.Dyn.info));
 	while (dynp != NULL && dynp->d_tag != DT_NULL) {
 		if (dynp->d_tag < DT_NUM)
 			dynld.Dyn.info[dynp->d_tag] = dynp->d_un.d_val;
-- 
2.20.1