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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442
test/jdk/java/nio/file/Files/IsSameFile.java
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test/jdk/java/nio/file/Files/IsSameFile.java
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/*
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* Copyright (c) 2025, 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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/* @test
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* @bug 8154364 8365626 8366254
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* @summary Test of Files.isSameFile
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* @library .. /test/lib
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* @run junit IsSameFile
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*/
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import java.io.IOException;
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import java.io.FileOutputStream;
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import java.nio.file.Files;
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import java.nio.file.FileSystem;
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import java.nio.file.FileSystemLoopException;
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import java.nio.file.FileSystemException;
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import java.nio.file.FileSystems;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.stream.Stream;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipOutputStream;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.TestInstance;
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import org.junit.jupiter.api.TestInstance.Lifecycle;
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import org.junit.jupiter.api.condition.EnabledIf;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.Arguments;
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import org.junit.jupiter.params.provider.MethodSource;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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@TestInstance(Lifecycle.PER_CLASS)
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public class IsSameFile {
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private Path home;
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private Path a;
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private Path aa;
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private Path b;
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private Path c;
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private boolean supportsSymbolicLinks;
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@BeforeAll
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public void init() throws IOException {
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Path cwd = Path.of(System.getProperty("user.dir"));
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home = Files.createTempDirectory(cwd, IsSameFile.class.getSimpleName());
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a = home.resolve("a");
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aa = home.resolve("a");
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b = home.resolve("b");
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c = home.resolve("c");
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supportsSymbolicLinks = TestUtil.supportsSymbolicLinks(home);
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}
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private boolean supportsSymbolicLinks() {
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return supportsSymbolicLinks;
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}
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public void deleteFiles() throws IOException {
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for (Path p : Files.list(home).toList())
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Files.deleteIfExists(p);
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}
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@AfterAll
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public void deleteHome() throws IOException {
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TestUtil.removeAll(home);
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}
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public void test(boolean expect, Path x, Path y) throws IOException {
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assertTrue(Files.isSameFile(x, y) == expect);
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}
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private Stream<Arguments> stringCompareSource() throws IOException {
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deleteFiles();
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List<Arguments> list = new ArrayList<Arguments>();
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Path x = Path.of("x/y/z");
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list.add(Arguments.of(true, x, x));
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list.add(Arguments.of(false, Path.of("w/x/y/z"), x));
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Path y = Path.of("v/w/x/../y/z");
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list.add(Arguments.of(false, y, Path.of("v/w/y/z")));
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list.add(Arguments.of(false, y, Path.of("v/w/x/y/../z")));
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return list.stream();
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}
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@ParameterizedTest
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@MethodSource("stringCompareSource")
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public void stringCompare(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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private Stream<Arguments> noneExistSource() throws IOException {
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deleteFiles();
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(true, a, a));
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list.add(Arguments.of(true, a, aa));
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list.add(Arguments.of(false, a, b));
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list.add(Arguments.of(true, b, b));
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return list.stream();
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}
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@Test
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public void obj2Null() {
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Path x = Path.of("x/y");
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assertThrows(NullPointerException.class, () -> Files.isSameFile(x, null));
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}
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private static void zipStringToFile(String entry, String content,
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Path path)
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throws IOException
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{
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FileOutputStream fos = new FileOutputStream(path.toString());
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ZipOutputStream zos = new ZipOutputStream(fos);
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ZipEntry zipEntry = new ZipEntry(entry);
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zos.putNextEntry(zipEntry);
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zos.write(content.getBytes());
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zos.close();
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fos.close();
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}
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@Test
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public void obj2Zip() throws IOException {
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deleteFiles();
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Files.createFile(a);
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zipStringToFile("quote.txt", "To be determined", b);
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try (FileSystem zipfs = FileSystems.newFileSystem(b)) {
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test(false, a, zipfs.getPath(b.toString()));
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}
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}
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@ParameterizedTest
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@MethodSource("noneExistSource")
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public void noneExist(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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private Stream<Arguments> aExistsSource() throws IOException {
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deleteFiles();
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Files.createFile(a);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(true, a, a));
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list.add(Arguments.of(true, a, aa));
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list.add(Arguments.of(false, a, b));
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return list.stream();
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}
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@ParameterizedTest
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@MethodSource("aExistsSource")
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public void aExists(boolean expect, Path x, Path y) throws IOException {
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test(expect, x, y);
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}
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private Stream<Arguments> abExistSource() throws IOException {
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deleteFiles();
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Files.createFile(a);
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Files.createFile(b);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(false, a, b));
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list.add(Arguments.of(true, b, b));
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list.add(Arguments.of(false, a, c));
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return list.stream();
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}
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@ParameterizedTest
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@MethodSource("abExistSource")
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public void abExist(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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private Stream<Arguments> abcExistSource() throws IOException {
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deleteFiles();
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Files.createFile(a);
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Files.createFile(b);
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List<Arguments> list = new ArrayList<Arguments>();
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if (supportsSymbolicLinks) {
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Files.createSymbolicLink(c, a);
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list.add(Arguments.of(true, a, c));
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}
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list.add(Arguments.of(false, a, b));
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return list.stream();
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}
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@ParameterizedTest
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@MethodSource("abcExistSource")
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public void abcExist(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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private Stream<Arguments> bcExistSource() throws IOException {
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deleteFiles();
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Files.createFile(b);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(true, a, a));
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list.add(Arguments.of(true, a, aa));
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list.add(Arguments.of(false, a, b));
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list.add(Arguments.of(true, b, b));
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if (supportsSymbolicLinks) {
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list.add(Arguments.of(false, a, c));
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Files.createSymbolicLink(c, a);
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}
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return list.stream();
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}
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@ParameterizedTest
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@MethodSource("bcExistSource")
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public void bcExist(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 => L2 => target
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// L3 => L4 => target
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//
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private Stream<Arguments> equalFollowingSource() throws IOException {
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deleteFiles();
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Path target = home.resolve("target");
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Files.createFile(target);
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Path L2 = home.resolve("link2");
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Files.createSymbolicLink(L2, target);
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Path L1 = home.resolve("link1");
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Files.createSymbolicLink(L1, L2);
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Path L4 = home.resolve("link4");
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Files.createSymbolicLink(L4, target);
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Path L3 = home.resolve("link3");
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Files.createSymbolicLink(L3, L4);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(true, L1, L3));
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("equalFollowingSource")
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public void equalFollowing(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 => L2 => target
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// L3 => L4 => cible
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//
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private Stream<Arguments> unequalFollowingSource() throws IOException {
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deleteFiles();
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Path target = home.resolve("target");
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Files.createFile(target);
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Path L2 = home.resolve("link2");
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Files.createSymbolicLink(L2, target);
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Path L1 = home.resolve("link1");
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Files.createSymbolicLink(L1, L2);
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Path cible = home.resolve("cible");
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Files.createFile(cible);
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Path L4 = home.resolve("link4");
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Files.createSymbolicLink(L4, cible);
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Path L3 = home.resolve("link3");
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Files.createSymbolicLink(L3, L4);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(false, L1, L3));
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("unequalFollowingSource")
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public void unequalFollowing(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 => L2 => <does not exist>
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// L3 => L4 => <does not exist>
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//
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private Stream<Arguments> unequalNotFollowingSource() throws IOException {
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deleteFiles();
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Path doesNotExist = home.resolve("doesNotExist");
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Path L2 = home.resolve("link2");
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Files.createSymbolicLink(L2, doesNotExist);
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Path L1 = home.resolve("link1");
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Files.createSymbolicLink(L1, L2);
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Path L4 = home.resolve("link4");
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Files.createSymbolicLink(L4, doesNotExist);
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Path L3 = home.resolve("link3");
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Files.createSymbolicLink(L3, L4);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(false, L1, L3));
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("unequalNotFollowingSource")
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public void unequalNotFollowing(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 => L2 => L3 => L4 => target
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//
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// isSameFile(LX,LY) should be true for all X, Y
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//
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private Stream<Arguments> multiLinkSource() throws IOException {
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deleteFiles();
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Path target = home.resolve("target");
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Files.createFile(target);
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Path[] links = new Path[4];
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links[3] = Files.createSymbolicLink(home.resolve("link4"), target);
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for (int i = 3; i > 0; i--) {
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links[i-1] = Files.createSymbolicLink(home.resolve("link"+i), links[i]);
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}
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List<Arguments> list = new ArrayList<Arguments>();
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for (int i = 0; i < 4; i++) {
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list.add(Arguments.of(true, links[i], target));
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for (int j = i+1; j < 4; j++)
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list.add(Arguments.of(true, links[i], links[j]));
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}
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("multiLinkSource")
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public void multiLink(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 => L2 => L3 => L4 => <does not exist>
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//
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// isSameFile(LX,LY) should be true for all X, Y
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//
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private Stream<Arguments> multiLinkNoTargetSource() throws IOException {
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deleteFiles();
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Path target = home.resolve("target");
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Files.createFile(target);
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Path[] links = new Path[4];
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links[3] = Files.createSymbolicLink(home.resolve("link4"), target);
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Files.delete(target);
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for (int i = 3; i > 0; i--) {
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links[i-1] = Files.createSymbolicLink(home.resolve("link"+i), links[i]);
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}
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List<Arguments> list = new ArrayList<Arguments>();
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for (int i = 0; i < 4; i++) {
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list.add(Arguments.of(false, links[i], target));
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for (int j = i+1; j < 4; j++)
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list.add(Arguments.of(true, links[i], links[j]));
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}
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("multiLinkNoTargetSource")
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public void multiLinkNoTarget(boolean expect, Path x, Path y)
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throws IOException {
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test(expect, x, y);
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}
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//
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// L1 -> L2 -> L3 -> L1...
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//
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// This is a loop and should throw FileSystemException.
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//
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private Stream<Arguments> linkLoopSource() throws IOException {
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deleteFiles();
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Path link1 = home.resolve("L1");
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Path link2 = home.resolve("L2");
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Path link3 = home.resolve("L3");
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Files.createSymbolicLink(link1, link2);
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Files.createSymbolicLink(link2, link3);
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Files.createSymbolicLink(link3, link1);
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List<Arguments> list = new ArrayList<Arguments>();
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list.add(Arguments.of(true, link1, link2));
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list.add(Arguments.of(true, link2, link3));
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list.add(Arguments.of(true, link3, link1));
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return list.stream();
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}
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@EnabledIf("supportsSymbolicLinks")
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@ParameterizedTest
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@MethodSource("linkLoopSource")
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public void linkLoop(boolean expect, Path x, Path y) throws IOException {
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assertThrows(FileSystemLoopException.class, () -> Files.isSameFile(x, y));
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}
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}
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