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/file/Files/CallWithInterruptSet.java

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+/*
+ * Copyright (c) 2018, 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 8205612
+ * @run junit CallWithInterruptSet
+ * @summary Test invoking Files methods with the interrupted status set
+ */
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class CallWithInterruptSet {
+
+    @Test
+    public void testReadAllBytes() throws Exception {
+        Path file = mkfile(100);
+        Thread.currentThread().interrupt();
+        try {
+            byte[] bytes = Files.readAllBytes(file);
+            assertEquals(100, bytes.length);
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+    }
+
+    @Test
+    public void testInputStream() throws IOException {
+        Path file = mkfile(100);
+        Thread.currentThread().interrupt();
+        try (InputStream in = Files.newInputStream(file)) {
+            int n = in.read(new byte[10]);
+            assertTrue(n > 0);
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+    }
+
+    @Test
+    public void testOutputStream() throws Exception {
+        Path file = mkfile();
+        try (OutputStream out = Files.newOutputStream(file)) {
+            Thread.currentThread().interrupt();
+            out.write(new byte[10]);
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+        assertEquals(10, Files.size(file));
+    }
+
+    @Test
+    public void testReadString() throws Exception {
+        Path file = mkfile();
+        Files.writeString(file, "hello");
+        Thread.currentThread().interrupt();
+        try {
+            String msg = Files.readString(file);
+            assertEquals("hello", msg);
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+    }
+
+    @Test
+    public void testWriteString() throws Exception {
+        Path file = mkfile();
+        Thread.currentThread().interrupt();
+        try {
+            Files.writeString(file, "hello");
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+        String msg = Files.readString(file);
+        assertEquals("hello", msg);
+    }
+
+    @Test
+    public void testBufferedReader() throws Exception {
+        Path file = mkfile();
+        Files.writeString(file, "hello");
+        Thread.currentThread().interrupt();
+        try (BufferedReader reader = Files.newBufferedReader(file)) {
+            String msg = reader.readLine();
+            assertEquals("hello", msg);
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+    }
+
+    @Test
+    public void testBufferedWriter() throws Exception {
+        Path file = mkfile();
+        Thread.currentThread().interrupt();
+        try (BufferedWriter writer = Files.newBufferedWriter(file)) {
+            writer.write("hello");
+        } finally {
+            assertTrue(Thread.interrupted());  // clear interrupt
+        }
+        String msg = Files.readString(file);
+        assertEquals("hello", msg);
+    }
+
+    private Path mkfile() throws IOException {
+        return Files.createTempFile(Path.of("."), "tmp", "tmp");
+    }
+
+    private Path mkfile(int size) throws IOException {
+        return Files.write(mkfile(), new byte[size]);
+    }
+
+}