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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/arraycopy/TestArrayCopyNoInit.java Normal file
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/*
* Copyright (c) 2014, 2025, 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 8064703 8347006
* @summary Deoptimization between array allocation and arraycopy may result in non initialized array
*
* @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:TypeProfileLevel=020
* compiler.arraycopy.TestArrayCopyNoInit
* @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:TypeProfileLevel=020
* -XX:+UseCompactObjectHeaders -XX:-UseTLAB
* compiler.arraycopy.TestArrayCopyNoInit
*/
package compiler.arraycopy;
public class TestArrayCopyNoInit {
static int[] m1(int[] src) {
int[] dest = new int[10];
try {
System.arraycopy(src, 0, dest, 0, 10);
} catch (NullPointerException npe) {
}
return dest;
}
static int[] m2(Object src, boolean flag) {
Class tmp = src.getClass();
if (flag) {
return null;
}
int[] dest = new int[10];
try {
System.arraycopy(src, 0, dest, 0, 10);
} catch (ArrayStoreException npe) {
}
return dest;
}
static int[] m3(int[] src, int src_offset) {
int tmp = src[0];
int[] dest = new int[10];
try {
System.arraycopy(src, src_offset, dest, 0, 10);
} catch (IndexOutOfBoundsException npe) {
}
return dest;
}
static int[] m4(int[] src, int length) {
int tmp = src[0];
int[] dest = new int[10];
try {
System.arraycopy(src, 0, dest, 0, length);
} catch (IndexOutOfBoundsException npe) {
}
return dest;
}
static TestArrayCopyNoInit[] m5(Object[] src) {
Object tmp = src[0];
TestArrayCopyNoInit[] dest = new TestArrayCopyNoInit[10];
System.arraycopy(src, 0, dest, 0, 10);
return dest;
}
static class A {
}
static class B extends A {
}
static class C extends B {
}
static class D extends C {
}
static class E extends D {
}
static class F extends E {
}
static class G extends F {
}
static class H extends G {
}
static class I extends H {
}
static H[] m6(Object[] src) {
Object tmp = src[0];
H[] dest = new H[10];
System.arraycopy(src, 0, dest, 0, 10);
return dest;
}
static Object m7_src(Object src) {
return src;
}
static int[] m7(Object src, boolean flag) {
Class tmp = src.getClass();
if (flag) {
return null;
}
src = m7_src(src);
int[] dest = new int[10];
try {
System.arraycopy(src, 0, dest, 0, 10);
} catch (ArrayStoreException npe) {
}
return dest;
}
static public void main(String[] args) {
boolean success = true;
int[] src = new int[10];
TestArrayCopyNoInit[] src2 = new TestArrayCopyNoInit[10];
int[] res = null;
TestArrayCopyNoInit[] res2 = null;
Object src_obj = new Object();
for (int i = 0; i < 20000; i++) {
m1(src);
}
res = m1(null);
for (int i = 0; i < res.length; i++) {
if (res[i] != 0) {
success = false;
System.out.println("Uninitialized array following NPE");
break;
}
}
for (int i = 0; i < 20000; i++) {
if ((i%2) == 0) {
m2(src, false);
} else {
m2(src_obj, true);
}
}
res = m2(src_obj, false);
for (int i = 0; i < res.length; i++) {
if (res[i] != 0) {
success = false;
System.out.println("Uninitialized array following failed array check");
break;
}
}
for (int i = 0; i < 20000; i++) {
m3(src, 0);
}
res = m3(src, -1);
for (int i = 0; i < res.length; i++) {
if (res[i] != 0) {
success = false;
System.out.println("Uninitialized array following failed src offset check");
break;
}
}
for (int i = 0; i < 20000; i++) {
m4(src, 0);
}
res = m4(src, -1);
for (int i = 0; i < res.length; i++) {
if (res[i] != 0) {
success = false;
System.out.println("Uninitialized array following failed length check");
break;
}
}
for (int i = 0; i < 20000; i++) {
m5(src2);
}
res2 = m5(new Object[10]);
for (int i = 0; i < res2.length; i++) {
if (res2[i] != null) {
success = false;
System.out.println("Uninitialized array following failed type check");
break;
}
}
H[] src3 = new H[10];
I b = new I();
for (int i = 0; i < 20000; i++) {
m6(src3);
}
H[] res3 = m6(new Object[10]);
for (int i = 0; i < res3.length; i++) {
if (res3[i] != null) {
success = false;
System.out.println("Uninitialized array following failed full type check");
break;
}
}
for (int i = 0; i < 20000; i++) {
if ((i%2) == 0) {
m7(src, false);
} else {
m7(src_obj, true);
}
}
res = m7(src_obj, false);
for (int i = 0; i < res.length; i++) {
if (res[i] != 0) {
success = false;
System.out.println("Uninitialized array following failed type check with return value profiling");
break;
}
}
if (!success) {
throw new RuntimeException("Some tests failed");
}
}
}