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/lang/ref/SoftReference/Pin.java
+++ b/test/jdk/java/lang/ref/SoftReference/Pin.java
@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 1997, 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.
+ */
+
+/* @test
+ * @bug 4076287
+ * @summary Invoking get on a SoftReference shouldn't pin the referent
+ * @run main/othervm -Xms16m -Xmx16m Pin
+ */
+
+
+import java.lang.ref.SoftReference;
+
+public class Pin {
+
+    static final int NUM_BLOCKS = 128;
+    static final int BLOCK_SIZE = 32768;
+
+    public static void main(String[] args) throws Exception {
+
+        SoftReference[] blocks = new SoftReference[NUM_BLOCKS];
+
+        byte[] block;
+
+        System.err.println("Filling array with " + NUM_BLOCKS +
+                           " SoftReferences to blocks of " +
+                           BLOCK_SIZE + " bytes.");
+
+        for (int i = 0; i < NUM_BLOCKS; ++ i) {
+            block = new byte[BLOCK_SIZE];
+            SoftReference ref = new SoftReference(block);
+            blocks[i] = ref;
+        }
+        block = null;
+
+        System.err.println("Allowing SoftReferences to be enqueued.");
+        System.gc();
+        Thread.sleep(1000);
+
+        /* -- Commenting out the following section will hide the bug -- */
+        System.err.println("Invoking get() on SoftReferences.");
+        for (int i = 0; i < NUM_BLOCKS; ++ i) {
+            block = (byte[]) blocks[i].get();
+        }
+        block = null;
+        /* -- end -- */
+
+        System.err.println("Forcing desperate garbage collection...");
+        java.util.Vector chain = new java.util.Vector();
+        try {
+            while (true) {
+                System.gc();
+                int[] hungry = new int[65536];
+                chain.addElement(hungry);
+                Thread.sleep(100);              // yield, for what it's worth
+            }
+        } catch (OutOfMemoryError e) {
+            chain = null; // Free memory for further work.
+            System.err.println("Got OutOfMemoryError, as expected.");
+        }
+
+        int emptyCount = 0, fullCount = 0;
+        System.err.print("Examining contents of array:");
+        for (int i = 0; i < NUM_BLOCKS; ++ i) {
+            block = (byte[]) blocks[i].get();
+            if (block == null) {
+                emptyCount++;
+            } else {
+                fullCount++;
+            }
+        }
+        System.err.println(" " + emptyCount + " empty, " +
+                           fullCount + " full.");
+        if (emptyCount == 0)
+            throw new Exception("No SoftReference instances were cleared");
+    }
+
+}