diff test/runtime/7107135/TestMT.java @ 8710:9058789475af

7107135: Stack guard pages are no more protected after loading a shared library with executable stack Summary: Detect the execstack attribute of the loaded library and attempt to fix the stack guard using Safepoint op. Reviewed-by: dholmes, zgu Contributed-by: ioi.lam@oracle.com
author iklam
date Tue, 05 Mar 2013 13:55:56 -0800
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/runtime/7107135/TestMT.java	Tue Mar 05 13:55:56 2013 -0800
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2002-2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011 SAP AG.  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.
+ */
+
+class TestMT {
+
+    static boolean loadLib(String libName) {
+        try {
+            System.loadLibrary(libName);
+            System.out.println("Loaded library "+ libName + ".");
+            return true;
+        } catch (SecurityException e) {
+            System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
+        } catch (UnsatisfiedLinkError e) {
+            System.out.println("loadLibrary(\"" + libName + "\") throws: " + e + "\n");
+        }
+        return false;
+    }
+
+    public static int counter        = 1;
+    static int Runner() {
+        counter = counter * -1;
+        int i = counter;
+        if (counter < 2) counter += Runner();
+        return i;
+    }
+
+    public static int run(String msg) {
+        try {
+            Runner();
+        } catch (StackOverflowError e) {
+            System.out.println(msg + " caught stack overflow error.");
+            return 0;
+        } catch (OutOfMemoryError e) {
+            return 0;
+        }
+        return 2;
+    }
+
+    public static void main(String argv[]) {
+        try {
+            for (int i = 0; i < 20; i++) {
+                Thread t = new DoStackOverflow("SpawnedThread " + i);
+                t.start();
+            }
+            run("Main thread");
+            loadLib("test-rwx");
+            run("Main thread");
+        } catch (Exception e) {
+            System.out.println(e);
+        }
+    }
+
+    static class DoStackOverflow extends Thread {
+        public DoStackOverflow(String name) {
+            super(name);
+        }
+        public void run() {
+            for (int i = 0; i < 10; ++i) {
+                TestMT.run(getName());
+                yield();
+            }
+        }
+    }
+}