russell@unturf.com
0a580b313d
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.
102 lines
4 KiB
Java
102 lines
4 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2026, NTT DATA
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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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import java.lang.foreign.Arena;
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import java.lang.foreign.FunctionDescriptor;
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import java.lang.foreign.Linker;
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import java.lang.foreign.MemoryLayout;
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import java.lang.foreign.ValueLayout;
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import com.sun.tools.attach.VirtualMachine;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.thread.ProcessThread;
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import jdk.test.lib.process.ProcessTools;
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/*
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* @test
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* @bug 8226919 8373867
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* @summary Test to make sure attach target process which is not dumpable.
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* @library /test/lib
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* @modules jdk.attach
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* @requires os.family == "linux"
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*
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* @run main/timeout=200 TestWithoutDumpableProcess
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*/
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public class TestWithoutDumpableProcess {
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private static final String EXPECTED_PROP_KEY = "attach.test";
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private static final String EXPECTED_PROP_VALUE = "true";
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public static class Debuggee {
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// Disable dumpable attribute via prctl(2)
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private static void disableDumpable() throws Throwable {
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var linker = Linker.nativeLinker();
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var prctl = linker.downcallHandle(linker.defaultLookup().findOrThrow("prctl"),
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FunctionDescriptor.of(ValueLayout.JAVA_INT, ValueLayout.JAVA_INT, ValueLayout.JAVA_LONG),
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Linker.Option.firstVariadicArg(1), Linker.Option.captureCallState("errno"));
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var errnoSeg = Arena.global().allocate(Linker.Option.captureStateLayout());
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final int PR_SET_DUMPABLE = 4; // from linux/prctl.h
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int ret = (int)prctl.invoke(errnoSeg, PR_SET_DUMPABLE, 0L);
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if (ret == -1){
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var hndErrno = Linker.Option
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.captureStateLayout()
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.varHandle(MemoryLayout.PathElement.groupElement("errno"));
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int errno = (int)hndErrno.get(errnoSeg, 0L);
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throw new RuntimeException("prctl: errno=" + errno);
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}
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}
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public static void main(String[] args) throws Throwable {
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disableDumpable();
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IO.println(Application.READY_MSG);
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while (IO.readln().equals(Application.SHUTDOWN_MSG));
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}
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public static ProcessThread start() {
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var args = new String[]{
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"--enable-native-access=ALL-UNNAMED",
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String.format("-D%s=%s", EXPECTED_PROP_KEY, EXPECTED_PROP_VALUE), Debuggee.class.getName()
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};
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var pb = ProcessTools.createLimitedTestJavaProcessBuilder(args);
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var pt = new ProcessThread("runApplication", Application.READY_MSG::equals, pb);
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pt.start();
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return pt;
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}
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}
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public static void main(String[] args) throws Exception {
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var pt = Debuggee.start();
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var vm = VirtualMachine.attach(Long.toString(pt.getPid()));
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var val = vm.getSystemProperties().getProperty(EXPECTED_PROP_KEY);
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Asserts.assertNotNull(val, "Expected sysprop not found");
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Asserts.assertEquals(val, "true", "Unexpected sysprop value");
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}
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}
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