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/nio/MappedByteBuffer/MapSyncFail.java
+++ b/test/jdk/java/nio/MappedByteBuffer/MapSyncFail.java
@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2019, 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
+ * @summary Test failure paths for MAP_SYNC FileChannel.map of non-DAX files
+ * @modules java.base/jdk.internal.misc
+ * @run main MapSyncFail true
+ * @run main MapSyncFail false
+ */
+
+import java.io.*;
+import java.nio.*;
+import java.util.*;
+import java.nio.channels.*;
+import jdk.nio.mapmode.*;
+import jdk.internal.misc.Unsafe;
+
+public class MapSyncFail {
+
+    public static final int K = 1024;
+
+    public static void main(String[] args) throws Exception {
+        if (args.length != 1) {
+            throw new Exception("Expected true or false as argument");
+        }
+        boolean is_rw = Boolean.valueOf(args[0]);
+        FileChannel.MapMode mode = (is_rw ? ExtendedMapMode.READ_WRITE_SYNC : ExtendedMapMode.READ_ONLY_SYNC);
+        // it is assumed that /tmp is not a DAX file system
+        File file = File.createTempFile("MapSyncFail", null);
+        file.deleteOnExit();
+        long filesize = (8 * K);
+        try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
+            raf.setLength(filesize);
+            FileChannel fc = raf.getChannel();
+            MappedByteBuffer mbb = fc.map(mode, 0, filesize);
+        } catch(IOException ioe) {
+            // when writeback is enabled for the current os/cpu
+            // combination the underlying mmap should be attempted and
+            // the map call should fail with IOException
+            if (!Unsafe.isWritebackEnabled()) {
+                throw new Exception("IOException not expected");
+            }
+            System.out.println("caught " + ioe);
+            ioe.printStackTrace();
+            return;
+        } catch (UnsupportedOperationException uoe) {
+            // when writeback is not enabled for the current os/cpu
+            // combination the mmap should not be attempted and the
+            // map call should fail with UnsupportedOperationException
+
+            if (Unsafe.isWritebackEnabled()) {
+                throw new Exception("UnsupportedOperationException not expected");
+            }
+            System.out.println("caught " + uoe);
+            uoe.printStackTrace();
+            return;
+        }
+
+        throw new Exception("expected IOException or UnsupportedOperationException");
+    }
+}