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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
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test/hotspot/jtreg/compiler/macronodes/TestCompleteVolatileStore.java Normal file
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/*
* Copyright (c) 2020, 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 8236140
* @requires vm.gc.Serial
* @summary Tests proper rehashing of a captured volatile field StoreL node when completing it.
* @run main/othervm -Xbatch -XX:+UseSerialGC -XX:CompileCommand=compileonly,compiler.macronodes.TestCompleteVolatileStore::test
* compiler.macronodes.TestCompleteVolatileStore
*/
package compiler.macronodes;
public class TestCompleteVolatileStore {
int i1 = 4;
public void test() {
/*
* The store to the volatile field 'l1' (StoreL) of 'a' is captured in the Initialize node of 'a'
* (i.e. additional input to it) and completed in InitializeNode::complete_stores.
* Since 'l1' is volatile, the hash of the StoreL is non-zero triggering the hash assertion failure.
*/
A a = new A();
// Make sure that the CheckCastPP node of 'a' is used in the input chain of the Intialize node of 'b'
B b = new B(a);
// Make sure 'b' is non-scalar-replacable to avoid eliminating all allocations
B[] arr = new B[i1];
arr[i1-3] = b;
}
public static void main(String[] strArr) {
TestCompleteVolatileStore _instance = new TestCompleteVolatileStore();
for (int i = 0; i < 10_000; i++ ) {
_instance.test();
}
}
}
class A {
// Needs to be volatile to have a non-zero hash for the StoreL node.
volatile long l1;
A() {
// StoreL gets captured and is later processed in InitializeNode::complete_stores while expanding the allocation node.
this.l1 = 256;
}
}
class B {
A a;
B(A a) {
this.a = a;
}
}