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.

src/java.base/linux/classes/sun/nio/ch/EventFD.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2021, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package sun.nio.ch;
+
+import java.io.IOException;
+
+/*
+ * Provides access to the Linux eventfd object.
+ */
+final class EventFD {
+    private final int efd;
+
+    /**
+     * Creates a blocking eventfd object with initial value zero.
+     */
+    EventFD() throws IOException {
+        efd = eventfd0();
+    }
+
+    int efd() {
+        return efd;
+    }
+
+    void set() throws IOException {
+        set0(efd);
+    }
+
+    void reset() throws IOException {
+        IOUtil.drain(efd);
+    }
+
+    void close() throws IOException {
+        FileDispatcherImpl.closeIntFD(efd);
+    }
+
+    private static native int eventfd0() throws IOException;
+
+    /**
+     * Writes the value 1 to the eventfd object as a long in the
+     * native byte order of the platform.
+     *
+     * @param the integral eventfd file descriptor
+     * @return the number of bytes written; should equal 8
+     */
+    private static native int set0(int efd) throws IOException;
+
+    static {
+        IOUtil.load();
+    }
+}