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

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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.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/util/Random/RandomTestCoverage.java Normal file
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/*
* Copyright (c) 2021, 2024, 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.math.BigInteger;
import java.security.SecureRandom;
import java.util.concurrent.ThreadLocalRandom;
import java.util.random.RandomGenerator;
import java.util.random.RandomGenerator.ArbitrarilyJumpableGenerator;
import java.util.random.RandomGenerator.JumpableGenerator;
import java.util.random.RandomGenerator.LeapableGenerator;
import java.util.random.RandomGenerator.SplittableGenerator;
import java.util.random.RandomGenerator.StreamableGenerator;
import java.util.random.RandomGeneratorFactory;
import java.util.stream.DoubleStream;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;
/**
* @test
* @summary Ensure that all implementations of RandomGenerator supply required methods.
* @bug 8248862
* @run main RandomTestCoverage
* @key randomness
*/
public class RandomTestCoverage {
static void coverRandomGenerator(RandomGenerator rng) {
boolean bool = rng.nextBoolean();
byte[] bytes = new byte[8];
rng.nextBytes(bytes);
int i1 = rng.nextInt();
int i2 = rng.nextInt(10);
int i3 = rng.nextInt(5, 10);
long l1 = rng.nextLong();
long l2 = rng.nextLong(10L);
long l3 = rng.nextLong(5L, 10L);
float f1 = rng.nextFloat();
float f2 = rng.nextFloat(1.0f);
float f3 = rng.nextFloat(0.5f, 1.0f);
double d1 = rng.nextDouble();
double d2 = rng.nextDouble(1.0);
double d3 = rng.nextDouble(0.5, 1.0);
double exp = rng.nextExponential();
double gauss1 = rng.nextGaussian();
double gauss2 = rng.nextGaussian(0.5, 2.0);
IntStream intStream1 = rng.ints();
IntStream intStream2 = rng.ints(5, 10);
IntStream intStream3 = rng.ints(5L);
IntStream intStream4 = rng.ints(5L, 5, 10);
LongStream longStream1 = rng.longs();
LongStream longStream2 = rng.longs(5L, 10L);
LongStream longStream3 = rng.longs(5L);
LongStream longStream4 = rng.longs(5L, 5L, 10L);
DoubleStream doubleStream1 = rng.doubles();
DoubleStream doubleStream2 = rng.doubles(0.5, 1.0);
DoubleStream doubleStream3 = rng.doubles(5);
DoubleStream doubleStream4 = rng.doubles(5, 0.5, 1.0);
}
static void checkPredicates(RandomGeneratorFactory<RandomGenerator> factory) {
RandomGenerator rng = factory.create();
if (rng instanceof ArbitrarilyJumpableGenerator != factory.isArbitrarilyJumpable()) {
throw new RuntimeException("isArbitrarilyJumpable failing");
}
if (rng instanceof JumpableGenerator != factory.isJumpable()) {
throw new RuntimeException("isJumpable failing");
}
if (rng instanceof LeapableGenerator != factory.isLeapable()) {
throw new RuntimeException("isLeapable failing");
}
if (rng instanceof SplittableGenerator != factory.isSplittable()) {
throw new RuntimeException("isArbitrarilyJumpable failing");
}
if (rng instanceof StreamableGenerator != factory.isStreamable()) {
throw new RuntimeException("isArbitrarilyJumpable failing");
}
}
static void coverStreamable(StreamableGenerator rng) {
Stream<RandomGenerator> rngs1 = rng.rngs();
Stream<RandomGenerator> rngs2 = rng.rngs(5L);
}
static void coverSplittable(SplittableGenerator rng) {
SplittableGenerator s1 = rng.split();
SplittableGenerator s2 = rng.split(rng);
Stream<SplittableGenerator> s3 = rng.splits();
Stream<SplittableGenerator> s4 = rng.splits(5L);
Stream<SplittableGenerator> s5 = rng.splits(rng);
Stream<SplittableGenerator> s6 = rng.splits(5L, rng);
}
static void coverJumpable(JumpableGenerator rng) {
JumpableGenerator j1 = rng.copy();
rng.jump();
RandomGenerator j2 = rng.copyAndJump();
double d = rng.jumpDistance();
Stream<RandomGenerator> j3 = rng.jumps();
Stream<RandomGenerator> j4 = rng.jumps(5L);
}
static void coverLeapable(LeapableGenerator rng) {
LeapableGenerator l1 = rng.copy();
rng.leap();
JumpableGenerator l2 = rng.copyAndLeap();
double d = rng.leapDistance();
Stream<JumpableGenerator> l3 = rng.leaps();
Stream<JumpableGenerator> l4 = rng.leaps(5L);
}
static void coverArbitrarilyJumpable(ArbitrarilyJumpableGenerator rng) {
ArbitrarilyJumpableGenerator a1 = rng.copy();
rng.jump();
rng.leap();
rng.jump(1.2345);
rng.jumpPowerOfTwo(4);
RandomGenerator a2 = rng.copyAndJump();
RandomGenerator a3 = rng.copyAndJump(1.2345);
Stream<ArbitrarilyJumpableGenerator> a4 = rng.jumps(1.2345);
Stream<ArbitrarilyJumpableGenerator> a5 = rng.jumps(5L, 1.2345);
}
static void coverOf(String name) {
coverRandomGenerator(RandomGenerator.of(name));
coverFactory(RandomGeneratorFactory.of(name));
}
static void coverFactory(RandomGeneratorFactory<RandomGenerator> factory) {
String name = factory.name();
String group = factory.group();
int stateBits = factory.stateBits();
int equidistribution = factory.equidistribution();
BigInteger period = factory.period();
boolean isStatistical = factory.isStatistical();
boolean isStochastic = factory.isStochastic();
boolean isHardware = factory.isHardware();
boolean isArbitrarilyJumpable = factory.isArbitrarilyJumpable();
boolean isJumpable = factory.isJumpable();
boolean isLeapable = factory.isLeapable();
boolean isSplittable = factory.isSplittable();
coverRandomGenerator(factory.create());
// test create(long)
switch (factory.name()) {
// SecureRandom doesn't have long constructors so we expect
// UnsupportedOperationException
case "SecureRandom" -> {
try {
factory.create(12345L);
throw new AssertionError("RandomGeneratorFactory.create(long) was expected" +
"to throw UnsupportedOperationException for " + factory.name() + " but didn't");
} catch (UnsupportedOperationException ignored) {
}
}
default -> coverRandomGenerator(factory.create(12345L));
}
// test create(byte[])
switch (factory.name()) {
// these don't have byte[] constructors so we expect UnsupportedOperationException
case "Random",
"SplittableRandom" -> {
try {
factory.create(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});
throw new AssertionError("RandomGeneratorFactory.create(byte[]) was expected" +
"to throw UnsupportedOperationException for " + factory.name() + " but didn't");
} catch (UnsupportedOperationException ignored) {
}
}
default -> coverRandomGenerator(factory.create(new byte[] {1, 2, 3, 4, 5, 6, 7, 8}));
}
}
static void coverDefaults() {
RandomGeneratorFactory<RandomGenerator> factory =
RandomGeneratorFactory.getDefault();
RandomGenerator rng = RandomGenerator.getDefault();
}
public static void main(String[] args) throws Throwable {
RandomGeneratorFactory.all()
.forEach(factory -> {
coverFactory(factory);
coverOf(factory.name());
});
RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isStreamable)
.forEach(factory -> {
coverStreamable((StreamableGenerator)factory.create());
});
RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isSplittable)
.forEach(factory -> {
coverSplittable((SplittableGenerator)factory.create());
});
RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isJumpable)
.forEach(factory -> {
coverJumpable((JumpableGenerator)factory.create());
});
RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isLeapable)
.forEach(factory -> {
coverLeapable((LeapableGenerator)factory.create());
});
RandomGeneratorFactory.all()
.filter(RandomGeneratorFactory::isArbitrarilyJumpable)
.forEach(factory -> {
coverArbitrarilyJumpable((ArbitrarilyJumpableGenerator)factory.create());
});
RandomGeneratorFactory.all()
.forEach(RandomTestCoverage::checkPredicates);
coverRandomGenerator(new SecureRandom());
coverRandomGenerator(ThreadLocalRandom.current());
coverDefaults();
}
}