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/io/BufferedInputStream/TransferToTrusted.java
+++ b/test/jdk/java/io/BufferedInputStream/TransferToTrusted.java
@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2023, 2024, 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 java.io.*;
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.Random;
+
+/*
+ * @test
+ * @bug 8320971
+ * @summary Verify BufferedInputStream.buf is used directly by
+ *          BufferedInputStream.implTransferTo() only when its OutputStream
+ *          parameter is trusted
+ * @key randomness
+ * @run main/othervm --add-opens=java.base/java.io=ALL-UNNAMED TransferToTrusted
+ */
+public class TransferToTrusted {
+
+    private static final Random RND = new Random(System.nanoTime());
+
+    private static final class UntrustedOutputStream extends OutputStream {
+
+        UntrustedOutputStream() {
+            super();
+        }
+
+        @Override
+        public void write(byte[] b, int off, int len) {
+            Objects.checkFromIndexSize(off, len, b.length);
+            byte[] tmp = new byte[len];
+            RND.nextBytes(tmp);
+            System.arraycopy(tmp, 0, b, off, len);
+        }
+
+        @Override
+        public void write(int b) throws IOException {
+            write(new byte[]{(byte) b});
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        final int length = 128;
+        byte[] buf = new byte[length];
+        RND.nextBytes(buf);
+
+        var outputStreams = new OutputStream[]{
+                new ByteArrayOutputStream(),
+                new FileOutputStream(File.createTempFile(TransferToTrusted.class.getName(), null)),
+                new PipedOutputStream(new PipedInputStream(length)),
+                new UntrustedOutputStream()
+        };
+
+        for (var out : outputStreams) {
+            System.err.println("out: " + out.getClass().getName());
+
+            var bis = new BufferedInputStream(new ByteArrayInputStream(buf.clone()));
+            try (out; bis) {
+                bis.read();//need this to fill the BIS.buf in
+                bis.transferTo(out);
+                var internalBuffer = bis.getClass().getDeclaredField("buf");
+                internalBuffer.setAccessible(true);
+                if (!Arrays.equals(buf, Arrays.copyOf((byte[]) internalBuffer.get(bis), length))) {
+                    throw new RuntimeException("Internal buffer was modified");
+                }
+            }
+        }
+    }
+}