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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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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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russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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119
test/hotspot/jtreg/runtime/ClassFile/PreviewVersion.java Normal file
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/*
* Copyright (c) 2018, 2023, 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
* @bug 8198908
* @summary Check that preview minor version and --enable-preview are handled
* correctly.
* @modules java.base/jdk.internal.misc
* @library /test/lib
* @run main PreviewVersion
*/
import java.io.File;
import jdk.test.lib.compiler.InMemoryJavaCompiler;
import jdk.test.lib.ByteCodeLoader;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.helpers.ClassFileInstaller;
public class PreviewVersion {
public static void main(String args[]) throws Throwable {
System.out.println("Regression test for bug 8198908");
byte klassbuf[] = InMemoryJavaCompiler.compile("PVTest",
"public class PVTest { " +
"public static void main(String argv[]) { " +
"System.out.println(\"Hi!\"); } }");
// Set class's minor version to 65535.
klassbuf[4] = -1;
klassbuf[5] = -1;
// Run the test. This should fail because --enable-preview is not specified.
ClassFileInstaller.writeClassToDisk("PVTest", klassbuf, System.getProperty("test.classes"));
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(
"-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
OutputAnalyzer oa = new OutputAnalyzer(pb.start());
oa.shouldContain("Preview features are not enabled");
oa.shouldHaveExitValue(1);
// This should be successful because --enable-preview is specified.
pb = ProcessTools.createLimitedTestJavaProcessBuilder("--enable-preview",
"-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
oa = new OutputAnalyzer(pb.start());
oa.shouldContain("Hi!");
oa.shouldHaveExitValue(0);
// Test -Xlog:class+preview
pb = ProcessTools.createLimitedTestJavaProcessBuilder("--enable-preview", "-Xlog:class+preview",
"-cp", "." + File.pathSeparator + System.getProperty("test.classes"), "PVTest");
oa = new OutputAnalyzer(pb.start());
oa.shouldContain("[info][class,preview] Loading class PVTest that depends on preview features");
oa.shouldHaveExitValue(0);
// Subtract 1 from class's major version. The class should fail to load
// because its major_version does not match the JVM current version.
int prev_major_version = (klassbuf[6] << 8 | klassbuf[7]) - 1;
klassbuf[6] = (byte)((prev_major_version >> 8) & 0xff);
klassbuf[7] = (byte)(prev_major_version & 0xff);
try {
ByteCodeLoader.load("PVTest", klassbuf);
throw new RuntimeException("UnsupportedClassVersionError exception not thrown");
} catch (java.lang.UnsupportedClassVersionError e) {
if (!e.getMessage().contains("compiled with preview features that are unsupported")) {
throw new RuntimeException(
"Wrong UnsupportedClassVersionError exception: " + e.getMessage());
}
}
// Set class's major version to 45. The class should load because class
// version 45.65535 is valid.
klassbuf[6] = 0;
klassbuf[7] = 45;
try {
ByteCodeLoader.load("PVTest", klassbuf);
} catch (java.lang.UnsupportedClassVersionError e) {
throw new RuntimeException(
"Unexpected UnsupportedClassVersionError exception thrown: " + e.getMessage());
}
// Check that a class with a recent older major version > JDK-11 and a minor version
// that is neither 0 nor 65535 fails to load.
klassbuf[6] = 0;
klassbuf[7] = 56;
klassbuf[4] = 0;
klassbuf[5] = 2;
try {
ByteCodeLoader.load("PVTest", klassbuf);
throw new RuntimeException("UnsupportedClassVersionError exception not thrown");
} catch (java.lang.UnsupportedClassVersionError e) {
if (!e.getMessage().contains("was compiled with an invalid non-zero minor version")) {
throw new RuntimeException(
"Wrong UnsupportedClassVersionError exception: " + e.getMessage());
}
}
}
}