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.

test/hotspot/jtreg/runtime/Metaspace/FragmentMetaspace.java

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+/*
+ * Copyright (c) 2013, 2023, 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.
+ */
+
+/**
+ * @test
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @modules java.compiler
+ * @run main/othervm/timeout=200 -Xmx1g FragmentMetaspace
+ */
+
+/**
+ * @test id=8320331
+ * @bug 8320331
+ * @requires vm.debug
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * @modules java.compiler
+ * @run main/othervm/timeout=200 -XX:+UnlockDiagnosticVMOptions -XX:+VerifyDuringGC -Xmx1g FragmentMetaspace
+ */
+
+import java.io.IOException;
+import jdk.test.lib.classloader.GeneratingCompilingClassLoader;
+
+/**
+ * Test that tries to fragment the native memory used by class loaders.
+ * This test creates class loaders that load classes of increasing size for every
+ * iteration. By increasing the size of the class meta data needed for every iteration
+ * we stress the subsystem for allocating native memory for meta data.
+ */
+public class FragmentMetaspace {
+
+    public static Class<?> c;
+
+    public static void main(String... args) {
+        runGrowing(Long.valueOf(System.getProperty("time", "40000")),
+            Integer.valueOf(System.getProperty("iterations", "100")));
+        // try to clean up and unload classes to decrease
+        // class verification time in debug vm
+        System.gc();
+    }
+
+    private static void runGrowing(long time, int iterations) {
+        long startTime = System.currentTimeMillis();
+        for (int i = 0; System.currentTimeMillis() < startTime + time && i < iterations; ++i) {
+            try {
+                GeneratingCompilingClassLoader gcl = new GeneratingCompilingClassLoader();
+
+                // getGeneratedClasses throws a RuntimeException in cases where
+                // the javac exit code is not 0. If the original reason for the exception is
+                // a "java.lang.OutOfMemoryError: Java heap space",
+                // increase the heap size in the @run tag and rerun the test.
+                // The heap can be exhausted by this test, but heap exhaustion
+                // is not a failure mode of this test and should be ignored.
+                c = gcl.getGeneratedClasses(i, 100)[0];
+                c.newInstance();
+                c = null;
+
+                gcl = null;
+            } catch (IOException | InstantiationException | IllegalAccessException ex) {
+                throw new RuntimeException(ex);
+            } catch (OutOfMemoryError oome) {
+                System.out.println("javac failed with OOM; ignored.");
+                return;
+            }
+        }
+    }
+}