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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.
This commit is contained in:
russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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test/hotspot/jtreg/compiler/loopopts/TestBadControlLoopLimitCheck.java Normal file
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/*
* Copyright (c) 2020, Red Hat, Inc. 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 8245714
* @requires vm.compiler2.enabled
* @summary "Bad graph detected in build_loop_late" when loads are pinned on loop limit check uncommon branch
*
* @run main/othervm -XX:-BackgroundCompilation -XX:ArrayCopyLoadStoreMaxElem=0 TestBadControlLoopLimitCheck
*/
public class TestBadControlLoopLimitCheck {
public static void main(String[] args) {
int[] int_array = {0, 0};
A[] obj_array = {new A(), new A()};
for (int i = 0; i < 20_000; i++) {
test1(int_array, 0, 10, false);
test_helper(42);
test2(obj_array, 0, 10, false);
}
}
private static int test1(int[] a, int start, int stop, boolean flag) {
int[] b = new int[2]; // non escaping allocation
System.arraycopy(a, 0, b, 0, 2); // optimized out
int v = 1;
int j = 0;
for (; j < 10; j++);
int inc = test_helper(j); // delay transformation to counted loop
// loop limit check here has loads pinned on unc branch
for (int i = start; i < stop; i += inc) {
v *= 2;
}
if (flag) {
v += b[0] + b[1];
}
return v;
}
private static int test2(A[] a, int start, int stop, boolean flag) {
A[] b = new A[2]; // non escaping allocation
System.arraycopy(a, 0, b, 0, 2); // optimized out
int v = 1;
int j = 0;
for (; j < 10; j++);
int inc = test_helper(j); // delay transformation to counted loop
// loop limit check here has loads pinned on unc branch
for (int i = start; i < stop; i += inc) {
v *= 2;
}
if (flag) {
v += b[0].f + b[1].f;
}
return v;
}
static class A {
int f;
}
static int test_helper(int j) {
return j == 10 ? 10 : 1;
}
}