From 3a9b9b2deb8e19fa10e7c3c99ad0baa2f90f13fa Mon Sep 17 00:00:00 2001
From: Kurt Roeckx <kurt@roeckx.be>
Date: Sat, 19 Nov 2016 17:20:34 +0100
Subject: Make the random number generator predictable when fuzzing.

Reviewed-by: Rich Salz <rsalz@openssl.org>
GH: #2023
---
 fuzz/server.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'fuzz/server.c')

diff --git a/fuzz/server.c b/fuzz/server.c
index b8a3ac44e3..4f2c794a4c 100644
--- a/fuzz/server.c
+++ b/fuzz/server.c
@@ -191,6 +191,10 @@ static const uint8_t kRSAPrivateKeyDER[] = {
 
 static SSL_CTX *ctx;
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+extern int rand_predictable;
+#endif
+
 int FuzzerInitialize(int *argc, char ***argv)
 {
     const uint8_t *bufp = kRSAPrivateKeyDER;
@@ -214,6 +218,10 @@ int FuzzerInitialize(int *argc, char ***argv)
     OPENSSL_assert(ret == 1);
     X509_free(cert);
 
+#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    rand_predictable = 1;
+#endif
+
     return 1;
 }
 
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