undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
2026-03-26 17:11:57 -04:00 · 2026-03-26 17:11:57 -04:00 · 0a580b313d
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
--- a/test/jdk/java/util/Random/RandomCanaryPi.java
+++ b/test/jdk/java/util/Random/RandomCanaryPi.java
@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.util.Comparator;
+import java.util.random.RandomGenerator;
+import java.util.random.RandomGenerator.*;
+import java.util.random.RandomGeneratorFactory;
+
+/**
+ * @test
+ * @summary test bit sequences produced by clases that implement interface RandomGenerator
+ * @bug 8248862
+ * @run main RandomCanaryPi
+ * @key randomness
+ */
+
+public class RandomCanaryPi {
+   static double pi(RandomGenerator rng) {
+        int N = 10000000;
+        int k = 0;
+
+        for (int i = 0; i < N; i++) {
+            double x = rng.nextDouble();
+            double y = rng.nextDouble();
+
+            if (x * x + y * y <= 1.0) {
+                k++;
+            }
+        }
+
+        return 4.0 * (double)k / (double)N;
+    }
+
+    static int failed = 0;
+
+    public static void main(String[] args) {
+        RandomGeneratorFactory.all()
+                .sorted(Comparator.comparing(RandomGeneratorFactory::name))
+                .forEach(factory -> {
+                    RandomGenerator rng = factory.create();
+                    double pi = pi(rng);
+                    double delta = Math.abs(Math.PI - pi);
+                    boolean pass = delta < 1E-2;
+
+                    if (!pass) {
+                        System.err.println("Algorithm    = " + factory.name() + " failed");
+                        System.err.println("Actual       = " + Math.PI);
+                        System.err.println("Monte Carlo  = " + pi);
+                        System.err.println("Delta        = " + delta);
+                        System.err.println();
+
+                        failed++;
+                    }
+                });
+        if (failed != 0) {
+            throw new RuntimeException(failed + " tests failed");
+        }
+    }
+}