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/nio/channels/FileLock/Overlaps.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2022, 2026, 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 5041655
+ * @summary Verify FileLock.overlaps
+ * @run junit Overlaps
+ */
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.FileLock;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.stream.Stream;
+
+import static java.lang.Boolean.*;
+import static java.nio.file.StandardOpenOption.*;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Overlaps {
+    private static final long POS = 27;
+    private static final long SIZE = 42;
+
+    private static FileChannel fc;
+
+    @BeforeAll
+    public static void before() throws IOException {
+        Path path = Files.createTempFile(Path.of("."), "foo", ".bar");
+        fc = FileChannel.open(path, CREATE, WRITE, DELETE_ON_CLOSE);
+        fc.position(POS);
+        fc.write(ByteBuffer.wrap(new byte[(int)SIZE]));
+    }
+
+    @AfterAll
+    public static void after() throws IOException {
+        fc.close();
+    }
+
+    public static Stream<Arguments> ranges() {
+        return Stream.of(
+            Arguments.of(POS, SIZE, -1, -1, FALSE),
+            Arguments.of(POS, SIZE, 0, -1, FALSE),
+            Arguments.of(POS, SIZE, POS - 1, -1, FALSE),
+            Arguments.of(POS, SIZE, POS + SIZE/2, -1, FALSE),
+            Arguments.of(POS, SIZE, POS + SIZE, -1, FALSE),
+            Arguments.of(POS, SIZE, -1, POS, FALSE),
+            Arguments.of(POS, SIZE, -1, POS + SIZE/2, TRUE),
+            Arguments.of(POS, SIZE, POS - 2, 1, FALSE),
+            Arguments.of(POS, SIZE, POS + 1, 1, TRUE),
+            Arguments.of(POS, SIZE, POS + SIZE/2, 0, TRUE),
+            Arguments.of(POS, SIZE, Long.MAX_VALUE, 2, FALSE),
+            Arguments.of(POS, SIZE, POS + SIZE / 2, Long.MAX_VALUE, TRUE),
+            Arguments.of(POS, SIZE, 0, 0, TRUE),
+            Arguments.of(Long.MAX_VALUE - SIZE/2, 0, 0, SIZE, FALSE),
+            Arguments.of(Long.MAX_VALUE - SIZE/2, 0, Long.MAX_VALUE - SIZE/4, SIZE, TRUE),
+            Arguments.of(Long.MAX_VALUE - SIZE/2, 0, Long.MAX_VALUE - SIZE, 0, TRUE),
+            Arguments.of(Long.MAX_VALUE - SIZE, 0, Long.MAX_VALUE - SIZE/2, 0, TRUE));
+    }
+
+    @ParameterizedTest
+    @MethodSource("ranges")
+    public void overlaps(long lockPos, long lockSize, long pos, long size,
+        boolean overlaps) throws IOException {
+        try (FileLock lock = fc.lock(lockPos, lockSize, false)) {
+            assertEquals(overlaps, lock.overlaps(pos, size));
+        }
+    }
+}