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/invoke/lookup/java.base/java/lang/LookupTest.java
+++ b/test/jdk/java/lang/invoke/lookup/java.base/java/lang/LookupTest.java
@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+package java.lang;
+
+import java.lang.invoke.*;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.reflect.InvocationTargetException;
+
+import static java.lang.invoke.MethodType.*;
+
+/*
+ * Verify that a Lookup object can be obtained statically from java.base
+ * but fails when it's obtained via reflection from java.base.
+ */
+public class LookupTest {
+    public static void main(String... args) throws Throwable {
+        // Get a full power lookup
+        Lookup lookup1 =  MethodHandles.lookup();
+        MethodHandle mh1 = lookup1.findStatic(lookup1.lookupClass(),
+                                              "foo",
+                                              methodType(String.class));
+        assertEquals((String) mh1.invokeExact(), foo());
+
+        // access protected member
+        MethodHandle mh2 = lookup1.findVirtual(java.lang.ClassLoader.class,
+                                               "getPackage",
+                                               methodType(Package.class, String.class));
+        ClassLoader loader = ClassLoader.getPlatformClassLoader();
+        Package pkg = (Package)mh2.invokeExact(loader, "java.lang");
+        assertEquals(pkg.getName(), "java.lang");
+
+        // MethodHandles.lookup will fail if it's called reflectively
+        try {
+            MethodHandles.class.getMethod("lookup").invoke(null);
+        } catch (InvocationTargetException e) {
+            if (!(e.getCause() instanceof InternalError)) {
+                throw e.getCause();
+            }
+        }
+    }
+
+    static String foo() { return "foo!"; }
+
+    static void assertEquals(Object o1, Object o2) {
+        if (!o1.equals(o2)) {
+            throw new RuntimeException(o1 + " != " + o2);
+        }
+    }
+}