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/util/zip/GZIP/GZIPOutputStreamHeaderTest.java
+++ b/test/jdk/java/util/zip/GZIP/GZIPOutputStreamHeaderTest.java
@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2020, 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.
+ */
+
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+/**
+ * @test
+ * @bug 8244706
+ * @summary Verify that the OS header flag in the stream written out by java.util.zip.GZIPOutputStream
+ * has the correct expected value
+ * @run junit GZIPOutputStreamHeaderTest
+ */
+public class GZIPOutputStreamHeaderTest {
+
+    private static final int OS_HEADER_INDEX = 9;
+    private static final int HEADER_VALUE_OS_UNKNOWN = 255;
+
+    /**
+     * Test that the {@code OS} header field in the GZIP output stream
+     * has a value of {@code 255} which represents "unknown"
+     */
+    @Test
+    public void testOSHeader() throws Exception {
+        final String data = "Hello world!!!";
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try (final GZIPOutputStream gzipOutputStream = new GZIPOutputStream(baos);) {
+            gzipOutputStream.write(data.getBytes(StandardCharsets.UTF_8));
+        }
+        final byte[] compressed = baos.toByteArray();
+        assertNotNull(compressed, "Compressed data is null");
+        assertEquals(HEADER_VALUE_OS_UNKNOWN, toUnsignedByte(compressed[OS_HEADER_INDEX]),
+                "Unexpected value for OS header");
+        // finally verify that the compressed data is readable back to the original
+        final String uncompressed;
+        try (final ByteArrayOutputStream os = new ByteArrayOutputStream();
+             final ByteArrayInputStream bis = new ByteArrayInputStream(compressed);
+             final GZIPInputStream gzipInputStream = new GZIPInputStream(bis)) {
+            gzipInputStream.transferTo(os);
+            uncompressed = new String(os.toByteArray(), StandardCharsets.UTF_8);
+        }
+        assertEquals(data, uncompressed, "Unexpected data read from GZIPInputStream");
+    }
+
+    private static int toUnsignedByte(final byte b) {
+        return b & 0xff;
+    }
+}