From 0995f6b340679063fa78e330792f86c94afb34b0 Mon Sep 17 00:00:00 2001
From: bluhm <bluhm@openbsd.org>
Date: Thu, 27 May 2021 18:18:41 +0000
Subject: [PATCH] Check that libexpat uses arc4random_buf as entropy source.

---
 regress/lib/libexpat/Makefile          |  4 +--
 regress/lib/libexpat/entropy/Makefile  | 11 +++++++
 regress/lib/libexpat/entropy/entropy.c | 40 ++++++++++++++++++++++++++
 3 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100644 regress/lib/libexpat/entropy/Makefile
 create mode 100644 regress/lib/libexpat/entropy/entropy.c

diff --git a/regress/lib/libexpat/Makefile b/regress/lib/libexpat/Makefile
index 16614df6e2a..63c2eaefb98 100644
--- a/regress/lib/libexpat/Makefile
+++ b/regress/lib/libexpat/Makefile
@@ -1,5 +1,5 @@
-# $OpenBSD: Makefile,v 1.1.1.1 2017/06/30 14:56:08 bluhm Exp $
+# $OpenBSD: Makefile,v 1.2 2021/05/27 18:18:41 bluhm Exp $
 
-SUBDIR=	runtests runtestspp benchmark
+SUBDIR=	runtests runtestspp benchmark entropy
 
 .include <bsd.subdir.mk>
diff --git a/regress/lib/libexpat/entropy/Makefile b/regress/lib/libexpat/entropy/Makefile
new file mode 100644
index 00000000000..522db333040
--- /dev/null
+++ b/regress/lib/libexpat/entropy/Makefile
@@ -0,0 +1,11 @@
+# $OpenBSD: Makefile,v 1.1 2021/05/27 18:18:41 bluhm Exp $
+# check that libexpat uses arc4random_buf as entropy source
+
+CLEANFILES=	stderr stdout
+
+run-regress-entropy: entropy
+	./entropy 2>stderr >stdout
+	cat stderr stdout
+	grep -q arc4random_buf stderr
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libexpat/entropy/entropy.c b/regress/lib/libexpat/entropy/entropy.c
new file mode 100644
index 00000000000..a227110b75c
--- /dev/null
+++ b/regress/lib/libexpat/entropy/entropy.c
@@ -0,0 +1,40 @@
+/*	$OpenBSD: entropy.c,v 1.1 2021/05/27 18:18:41 bluhm Exp $	*/
+
+/*
+ * Copyright (c) 2021 Alexander Bluhm <bluhm@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <err.h>
+#include <expat.h>
+#include <string.h>
+
+int
+main(int argc, char *argv[])
+{
+	XML_Parser p;
+	enum XML_Status s;
+
+	if (setenv("EXPAT_ENTROPY_DEBUG", "1", 1) != 0)
+		err(1, "setenv EXPAT_ENTROPY_DEBUG");
+
+	p = XML_ParserCreate(NULL);
+	if (p == NULL)
+		errx(1, "XML_ParserCreate");
+	s = XML_Parse(p, "", 0, 0);
+	if (s != XML_STATUS_OK)
+		errx(1, "XML_Parse: %d", s);
+
+	return 0;
+}
-- 
2.20.1