undefect. CWE-407 — 63 sites patched across 27 ecosystems

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.

test/jdk/java/awt/font/TextLayout/FontLayoutStressTest.java

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+/*
+ * Copyright (C) 2019 JetBrains s.r.o.
+ * 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 8220231
+ * @summary Cache HarfBuzz face object for same font's text layout calls
+ * @comment Test layout operations for the same font performed simultaneously
+ *          from multiple threads
+ */
+
+import java.awt.Font;
+import java.awt.font.FontRenderContext;
+import java.awt.font.GlyphVector;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class FontLayoutStressTest {
+    private static final int NUMBER_OF_THREADS =
+            Runtime.getRuntime().availableProcessors() * 2;
+    private static final long TIME_TO_RUN_NS = 1_000_000_000; // 1 second
+    private static final Font FONT = new Font(Font.SERIF, Font.PLAIN, 12);
+    private static final FontRenderContext FRC = new FontRenderContext(null,
+            false, false);
+    private static final char[] TEXT = "Lorem ipsum dolor sit amet, ..."
+            .toCharArray();
+
+    private static double doLayout() {
+        GlyphVector gv = FONT.layoutGlyphVector(FRC, TEXT, 0, TEXT.length,
+                Font.LAYOUT_LEFT_TO_RIGHT);
+        return gv.getGlyphPosition(gv.getNumGlyphs()).getX();
+    }
+
+    public static void main(String[] args) throws Throwable {
+        double expectedWidth = doLayout();
+        AtomicReference<Throwable> throwableRef = new AtomicReference<>();
+        CyclicBarrier barrier = new CyclicBarrier(NUMBER_OF_THREADS);
+        List<Thread> threads = new ArrayList<>();
+        for (int i = 0; i < NUMBER_OF_THREADS; i++) {
+            Thread thread = new Thread(() -> {
+                try {
+                    barrier.await();
+                    long timeToStop = System.nanoTime() + TIME_TO_RUN_NS;
+                    while (System.nanoTime() < timeToStop) {
+                        double width = doLayout();
+                        if (width != expectedWidth) {
+                            throw new RuntimeException(
+                                    "Unexpected layout result");
+                        }
+                    }
+                } catch (Throwable e) {
+                    throwableRef.set(e);
+                }
+            });
+            threads.add(thread);
+            thread.start();
+        }
+        for (Thread thread : threads) {
+            thread.join();
+        }
+        Throwable throwable = throwableRef.get();
+        if (throwable != null) {
+            throw throwable;
+        }
+    }
+}