1 files changed, 72 insertions, 0 deletions
diff --git a/lib/libc/gen/arc4random-compat.c b/lib/libc/gen/arc4random-compat.c
new file mode 100644
index 000000000000..065998e80553
--- /dev/null
+++ b/lib/libc/gen/arc4random-compat.c
@@ -0,0 +1,72 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Google LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <syslog.h>
+
+/*
+ * The following functions were removed from OpenBSD for good reasons:
+ *
+ *  - arc4random_stir()
+ *  - arc4random_addrandom()
+ *
+ * On FreeBSD, for backward ABI compatibility, we provide two wrapper which
+ * logs this event and returns.
+ */
+
+void __arc4random_stir_fbsd11(void);
+void __arc4random_addrandom_fbsd11(u_char *, int);
+
+void
+__arc4random_stir_fbsd11(void)
+{
+	static bool warned = false;
+
+	if (!warned)
+		syslog(LOG_DEBUG, "Deprecated function arc4random_stir() called");
+	warned = true;
+}
+
+void
+__arc4random_addrandom_fbsd11(u_char * dummy1 __unused, int dummy2 __unused)
+{
+	static bool warned = false;
+
+	if (!warned)
+		syslog(LOG_DEBUG, "Deprecated function arc4random_addrandom() called");
+	warned = true;
+}
+
+__sym_compat(arc4random_stir, __arc4random_stir_fbsd11, FBSD_1.0);
+__sym_compat(arc4random_addrandom, __arc4random_addrandom_fbsd11, FBSD_1.0);