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.
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374
test/jdk/java/util/logging/CheckZombieLockTest.java
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374
test/jdk/java/util/logging/CheckZombieLockTest.java
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/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8048020
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* @author Daniel Fuchs
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* @summary Regression on java.util.logging.FileHandler.
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* The fix is to avoid filling up the file system with zombie lock files.
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*
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* @run main/othervm CheckZombieLockTest WRITABLE CLOSE CLEANUP
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* @run main/othervm CheckZombieLockTest CLEANUP
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* @run main/othervm CheckZombieLockTest WRITABLE
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* @run main/othervm CheckZombieLockTest CREATE_FIRST
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* @run main/othervm CheckZombieLockTest CREATE_NEXT
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* @run main/othervm CheckZombieLockTest CREATE_NEXT
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* @run main/othervm CheckZombieLockTest CLEANUP
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* @run main/othervm CheckZombieLockTest REUSE
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* @run main/othervm CheckZombieLockTest CLEANUP
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* @key randomness
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*/
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import java.io.File;
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import java.io.IOException;
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import java.nio.channels.FileChannel;
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import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.UUID;
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import java.util.logging.FileHandler;
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import java.util.logging.Level;
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import java.util.logging.LogRecord;
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import static java.nio.file.StandardOpenOption.*;
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public class CheckZombieLockTest {
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private static final String WRITABLE_DIR = "writable-lockfile-dir";
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private static volatile boolean supportsLocking = true;
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static enum TestCase {
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WRITABLE, // just verifies that we can create a file in our 'writable-lockfile-dir'
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CLOSE, // checks that closing a FileHandler removes its lock file
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CREATE_FIRST, // verifies that 'writable-lockfile-dir' contains no lock, then creates a first FileHandler.
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CREATE_NEXT, // verifies that 'writable-lockfile-dir' contains a single lock, then creates the next FileHandler
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REUSE, // verifies that zombie lock files can be reused
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CLEANUP // removes "writable-lockfile-dir"
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};
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public static void main(String... args) throws IOException {
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// we'll base all file creation attempts on the system temp directory,
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// %t
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File writableDir = setup();
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System.out.println("Writable dir is: " + writableDir.getAbsolutePath());
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// we now have one writable directory to work with:
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// writableDir
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if (args == null || args.length == 0) {
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args = new String[] { "WRITABLE", "CLOSE", "CLEANUP" };
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}
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try {
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runTests(writableDir, args);
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} catch (RuntimeException | IOException | Error x) {
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// some error occured: cleanup
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delete(writableDir);
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throw x;
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}
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}
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/**
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* @param writableDir in which log and lock file are created
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* @throws SecurityException
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* @throws RuntimeException
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* @throws IOException
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*/
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private static void runTests(File writableDir, String... args) throws SecurityException,
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RuntimeException, IOException {
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for (String arg : args) {
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switch(TestCase.valueOf(arg)) {
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// Test 1: makes sure we can create FileHandler in writable directory
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case WRITABLE: checkWritable(writableDir); break;
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// Test 2: verifies that FileHandler.close() cleans up its lock file
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case CLOSE: testFileHandlerClose(writableDir); break;
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// Test 3: creates the first file handler
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case CREATE_FIRST: testFileHandlerCreate(writableDir, true); break;
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// Test 4, 5, ... creates the next file handler
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case CREATE_NEXT: testFileHandlerCreate(writableDir, false); break;
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// Checks that zombie lock files are reused appropriatly
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case REUSE: testFileHandlerReuse(writableDir); break;
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// Removes the writableDir
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case CLEANUP: delete(writableDir); break;
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default: throw new RuntimeException("No such test case: " + arg);
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}
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}
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}
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/**
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* @param writableDir in which log and lock file are created
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* @throws SecurityException
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* @throws RuntimeException
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* @throws IOException
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*/
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private static void checkWritable(File writableDir) throws SecurityException,
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RuntimeException, IOException {
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// Test 1: make sure we can create/delete files in the writable dir.
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final File file = new File(writableDir, "test.txt");
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if (!createFile(file, false)) {
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throw new IOException("Can't create " + file + "\n\tUnable to run test");
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} else {
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delete(file);
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}
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}
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private static FileHandler createFileHandler(File writableDir) throws SecurityException,
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RuntimeException, IOException {
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// Test 1: make sure we can create FileHandler in writable directory
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try {
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FileHandler handler = new FileHandler("%t/" + WRITABLE_DIR + "/log.log");
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handler.publish(new LogRecord(Level.INFO, handler.toString()));
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handler.flush();
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return handler;
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} catch (IOException ex) {
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throw new RuntimeException("Test failed: should have been able"
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+ " to create FileHandler for " + "%t/" + WRITABLE_DIR
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+ "/log.log in writable directory.", ex);
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}
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}
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private static List<File> listLocks(File writableDir, boolean print)
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throws IOException {
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List<File> locks = new ArrayList<>();
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for (File f : writableDir.listFiles()) {
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if (print) {
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System.out.println("Found file: " + f.getName());
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}
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if (f.getName().endsWith(".lck")) {
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locks.add(f);
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}
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}
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return locks;
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}
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private static void testFileHandlerClose(File writableDir) throws IOException {
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File fakeLock = new File(writableDir, "log.log.lck");
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if (!createFile(fakeLock, false)) {
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throw new IOException("Can't create fake lock file: " + fakeLock);
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}
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try {
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List<File> before = listLocks(writableDir, true);
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System.out.println("before: " + before.size() + " locks found");
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FileHandler handler = createFileHandler(writableDir);
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System.out.println("handler created: " + handler);
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List<File> after = listLocks(writableDir, true);
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System.out.println("after creating handler: " + after.size() + " locks found");
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handler.close();
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System.out.println("handler closed: " + handler);
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List<File> afterClose = listLocks(writableDir, true);
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System.out.println("after closing handler: " + afterClose.size() + " locks found");
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afterClose.removeAll(before);
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if (!afterClose.isEmpty()) {
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throw new RuntimeException("Zombie lock file detected: " + afterClose);
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}
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} finally {
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if (fakeLock.canRead()) delete(fakeLock);
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}
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List<File> finalLocks = listLocks(writableDir, false);
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System.out.println("After cleanup: " + finalLocks.size() + " locks found");
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}
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private static void testFileHandlerReuse(File writableDir) throws IOException {
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List<File> before = listLocks(writableDir, true);
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System.out.println("before: " + before.size() + " locks found");
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try {
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if (!before.isEmpty()) {
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throw new RuntimeException("Expected no lock file! Found: " + before);
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}
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} finally {
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before.stream().forEach(CheckZombieLockTest::delete);
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}
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FileHandler handler1 = createFileHandler(writableDir);
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System.out.println("handler created: " + handler1);
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List<File> after = listLocks(writableDir, true);
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System.out.println("after creating handler: " + after.size() + " locks found");
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if (after.size() != 1) {
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throw new RuntimeException("Unexpected number of lock files found for "
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+ handler1 + ": " + after);
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}
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final File lock = after.get(0);
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after.clear();
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handler1.close();
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after = listLocks(writableDir, true);
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System.out.println("after closing handler: " + after.size() + " locks found");
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if (!after.isEmpty()) {
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throw new RuntimeException("Unexpected number of lock files found for "
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+ handler1 + ": " + after);
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}
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if (!createFile(lock, false)) {
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throw new IOException("Can't create fake lock file: " + lock);
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}
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try {
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before = listLocks(writableDir, true);
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System.out.println("before: " + before.size() + " locks found");
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if (before.size() != 1) {
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throw new RuntimeException("Unexpected number of lock files found: "
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+ before + " expected [" + lock + "].");
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}
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FileHandler handler2 = createFileHandler(writableDir);
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System.out.println("handler created: " + handler2);
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after = listLocks(writableDir, true);
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System.out.println("after creating handler: " + after.size() + " locks found");
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after.removeAll(before);
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if (!after.isEmpty()) {
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throw new RuntimeException("Unexpected lock file found: " + after
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+ "\n\t" + lock + " should have been reused");
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}
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handler2.close();
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System.out.println("handler closed: " + handler2);
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List<File> afterClose = listLocks(writableDir, true);
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System.out.println("after closing handler: " + afterClose.size() + " locks found");
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if (!afterClose.isEmpty()) {
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throw new RuntimeException("Zombie lock file detected: " + afterClose);
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}
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if (supportsLocking) {
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handler2 = null;
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try (FileChannel fc = FileChannel.open(lock.toPath(), CREATE_NEW, APPEND, WRITE)) {
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if (fc.tryLock() != null) {
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System.out.println("locked: " + lock);
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handler2 = createFileHandler(writableDir);
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System.out.println("handler created: " + handler2);
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after = listLocks(writableDir, true);
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System.out.println("after creating handler: " + after.size()
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+ " locks found");
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after.removeAll(before);
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if (after.size() != 1) {
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throw new RuntimeException("Unexpected lock files found: " + after
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+ "\n\t" + lock + " should not have been reused");
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}
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} else {
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throw new RuntimeException("Failed to lock: " + lock);
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}
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} finally {
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if (handler2 != null) handler2.close();
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delete(lock);
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}
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}
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} finally {
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List<File> finalLocks = listLocks(writableDir, false);
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System.out.println("end: " + finalLocks.size() + " locks found");
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delete(writableDir);
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}
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}
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private static void testFileHandlerCreate(File writableDir, boolean first)
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throws IOException {
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List<File> before = listLocks(writableDir, true);
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System.out.println("before: " + before.size() + " locks found");
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try {
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if (first && !before.isEmpty()) {
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throw new RuntimeException("Expected no lock file! Found: " + before);
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} else if (!first && before.size() != 1) {
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throw new RuntimeException("Expected a single lock file! Found: " + before);
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}
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} finally {
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before.stream().forEach(CheckZombieLockTest::delete);
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}
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FileHandler handler = createFileHandler(writableDir);
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System.out.println("handler created: " + handler);
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List<File> after = listLocks(writableDir, true);
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System.out.println("after creating handler: " + after.size() + " locks found");
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if (after.size() != 1) {
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throw new RuntimeException("Unexpected number of lock files found for "
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+ handler + ": " + after);
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}
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}
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/**
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* Setup all the files and directories needed for the tests
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*
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* @return writable directory created that needs to be deleted when done
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* @throws RuntimeException
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*/
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private static File setup() throws RuntimeException {
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// First do some setup in the temporary directory (using same logic as
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// FileHandler for %t pattern)
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String tmpDir = System.getProperty("java.io.tmpdir"); // i.e. %t
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if (tmpDir == null) {
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tmpDir = System.getProperty("user.home");
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}
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File tmpOrHomeDir = new File(tmpDir);
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// Create a writable directory here (%t/writable-lockfile-dir)
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File writableDir = new File(tmpOrHomeDir, WRITABLE_DIR);
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if (!createFile(writableDir, true)) {
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throw new RuntimeException("Test setup failed: unable to create"
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+ " writable working directory "
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+ writableDir.getAbsolutePath() );
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}
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// try to determine whether file locking is supported
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final String uniqueFileName = UUID.randomUUID().toString()+".lck";
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try (FileChannel fc = FileChannel.open(Paths.get(writableDir.getAbsolutePath(),
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uniqueFileName), CREATE_NEW, APPEND, DELETE_ON_CLOSE)) {
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try {
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fc.tryLock();
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} catch (IOException x) {
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supportsLocking = false;
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}
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} catch (IOException t) {
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// should not happen
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System.err.println("Failed to create new file " + uniqueFileName +
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" in " + writableDir.getAbsolutePath());
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throw new RuntimeException("Test setup failed: unable to run test", t);
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}
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return writableDir;
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}
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/**
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* @param newFile
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* @return true if file already exists or creation succeeded
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*/
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private static boolean createFile(File newFile, boolean makeDirectory) {
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if (newFile.exists()) {
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return true;
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}
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if (makeDirectory) {
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return newFile.mkdir();
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} else {
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try {
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return newFile.createNewFile();
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} catch (IOException ioex) {
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ioex.printStackTrace();
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return false;
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}
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}
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}
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/*
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* Recursively delete all files starting at specified file
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*/
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private static void delete(File f) {
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if (f != null && f.isDirectory()) {
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for (File c : f.listFiles())
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delete(c);
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}
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if (!f.delete())
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System.err.println(
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"WARNING: unable to delete/cleanup writable test directory: "
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+ f );
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}
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}
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