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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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test/hotspot/jtreg/compiler/codecache/OverflowCodeCacheTest.java Normal file
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/*
* Copyright (c) 2014, 2022, 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 OverflowCodeCacheTest
* @bug 8059550 8279356
* @summary testing of code cache segments overflow
* @library /test/lib
* @modules java.base/jdk.internal.misc
* java.management
*
* @build jdk.test.whitebox.WhiteBox
* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,null::*
* -XX:-SegmentedCodeCache -Xmixed
* compiler.codecache.OverflowCodeCacheTest CompilationDisabled
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,null::*
* -XX:+SegmentedCodeCache -Xmixed
* compiler.codecache.OverflowCodeCacheTest CompilationDisabled
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI -XX:-SegmentedCodeCache -Xmixed
* compiler.codecache.OverflowCodeCacheTest
*/
package compiler.codecache;
import jdk.test.lib.Asserts;
import jdk.test.whitebox.WhiteBox;
import jdk.test.whitebox.code.BlobType;
import jdk.test.whitebox.code.CodeBlob;
import java.lang.management.MemoryPoolMXBean;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.EnumSet;
class Helper {
// Uncommon signature to prevent sharing and force creation of a new adapter
public void method(float a, float b, float c, Object o) { }
}
public class OverflowCodeCacheTest {
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
private static boolean COMPILATION_DISABLED = false;
public static void main(String[] args) {
COMPILATION_DISABLED = args.length > 0;
EnumSet<BlobType> blobTypes = BlobType.getAvailable();
for (BlobType type : blobTypes) {
new OverflowCodeCacheTest(type).test();
}
}
private final BlobType type;
private final MemoryPoolMXBean bean;
private OverflowCodeCacheTest(BlobType type) {
this.type = type;
this.bean = type.getMemoryPool();
}
private void test() {
System.out.printf("type %s%n", type);
System.out.println("allocating till possible...");
ArrayList<Long> blobs = new ArrayList<>();
int compilationActivityMode = -1;
// Lock compilation to be able to better control code cache space
WHITE_BOX.lockCompilation();
try {
long addr;
int size = (int) (getHeapSize() >> 7);
while ((addr = WHITE_BOX.allocateCodeBlob(size, type.id)) != 0) {
blobs.add(addr);
BlobType actualType = CodeBlob.getCodeBlob(addr).code_blob_type;
if (actualType != type) {
// check we got allowed overflow handling
Asserts.assertTrue(type.allowTypeWhenOverflow(actualType),
type + " doesn't allow using " + actualType + " when overflow");
}
}
/* now, remember compilationActivityMode to check it later, after freeing, since we
possibly have no free cache for further work */
compilationActivityMode = WHITE_BOX.getCompilationActivityMode();
// Use smallest allocation size to make sure all of the available space
// is filled up. Don't free these below to put some pressure on the sweeper.
while ((addr = WHITE_BOX.allocateCodeBlob(1, type.id)) != 0) { }
} finally {
try {
// Trigger creation of a new adapter for Helper::method
// which will fail because we are out of code cache space.
Helper helper = new Helper();
} catch (VirtualMachineError e) {
// Expected
}
// Free code cache space
for (Long blob : blobs) {
WHITE_BOX.freeCodeBlob(blob);
}
// Let the GC free nmethods and re-enable compilation
WHITE_BOX.unlockCompilation();
WHITE_BOX.fullGC();
// Trigger compilation of Helper::method which will hit an assert because
// adapter creation failed above due to a lack of code cache space.
Helper helper = new Helper();
for (int i = 0; i < 100_000; i++) {
helper.method(0, 0, 0, null);
}
}
// Only check this if compilation is disabled, otherwise the sweeper might have
// freed enough nmethods to allow for re-enabling compilation.
if (COMPILATION_DISABLED) {
Asserts.assertNotEquals(compilationActivityMode, 1 /* run_compilation*/,
"Compilation must be disabled when CodeCache(CodeHeap) overflows");
}
}
private long getHeapSize() {
return bean.getUsage().getMax();
}
}