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/jdk/java/foreign/TestStringEncodingJumbo.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2023, 2025, 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 org.testng.annotations.*;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.lang.foreign.Arena;
+import java.lang.foreign.MemorySegment;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.function.Consumer;
+
+import static java.lang.foreign.ValueLayout.*;
+import static org.testng.Assert.*;
+
+/*
+ * @test
+ * @modules java.base/jdk.internal.foreign
+ * @requires sun.arch.data.model == "64"
+ * @requires vm.flavor != "zero"
+ *
+ * @run testng/othervm/timeout=480 -Xmx6G TestStringEncodingJumbo
+ */
+
+public class TestStringEncodingJumbo {
+
+    @Test()
+    public void testJumboSegment() {
+        testWithJumboSegment("testJumboSegment", segment -> {
+            segment.fill((byte) 1);
+            segment.set(JAVA_BYTE, Integer.MAX_VALUE + 10L, (byte) 0);
+            String big = segment.getString(100);
+            assertEquals(big.length(), Integer.MAX_VALUE - (100 - 10));
+        });
+    }
+
+    @Test()
+    public void testStringLargerThanMaxInt() {
+        testWithJumboSegment("testStringLargerThanMaxInt", segment -> {
+            segment.fill((byte) 1);
+            segment.set(JAVA_BYTE, Integer.MAX_VALUE + 10L, (byte) 0);
+            assertThrows(IllegalArgumentException.class, () -> {
+                segment.getString(0);
+            });
+        });
+    }
+
+    private static void testWithJumboSegment(String testName, Consumer<MemorySegment> tester) {
+        Path path = Paths.get("mapped_file");
+        try {
+            // Relly try to make sure the file is deleted after use
+            path.toFile().deleteOnExit();
+            deleteIfExistsOrThrow(path);
+            try (RandomAccessFile raf = new RandomAccessFile(path.toFile(), "rw")) {
+                FileChannel fc = raf.getChannel();
+                try (Arena arena = Arena.ofConfined()) {
+                    var segment = fc.map(FileChannel.MapMode.READ_WRITE, 0L, (long) Integer.MAX_VALUE + 100, arena);
+                    tester.accept(segment);
+                }
+            }
+        } catch (Exception e) {
+            throw new AssertionError(e);
+        } catch (OutOfMemoryError oome) {
+            // Unfortunately, we run out of memory and cannot run this test in this configuration
+            System.out.println("Skipping test because of insufficient memory: " + testName);
+        } finally {
+            deleteIfExistsOrThrow(path);
+        }
+    }
+
+    private static void deleteIfExistsOrThrow(Path file) {
+        try {
+            Files.deleteIfExists(file);
+        } catch (IOException ioe) {
+            throw new AssertionError("Unable to delete mapped file: " + file);
+        }
+    }
+
+}