1 /*
   2  * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2020 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 
  28 #include "memory/metaspace/msArena.hpp"
  29 #include "memory/metaspace/msTestHelpers.hpp"
  30 #include "memory/metaspace/msSettings.hpp"
  31 
  32 //#define LOG_PLEASE
  33 #include "metaspaceGtestCommon.hpp"
  34 #include "metaspaceGtestContexts.hpp"
  35 
  36 #ifdef ASSERT
  37 
  38 using metaspace::MetaspaceArena;
  39 using metaspace::MetaspaceTestArena;
  40 using metaspace::Settings;
  41 
  42 
  43 // Test that overwriting memory triggers an assert if allocation guards are enabled.
  44 //  Note: We use TEST_VM_ASSERT_MSG. However, an assert is only triggered if allocation
  45 //  guards are enabled; if guards are disabled for the gtests, this test would fail.
  46 //  So for that case, we trigger a fake assert.
  47 TEST_VM_ASSERT_MSG(metaspace, test_overwriter, "Corrupt block") {
  48 
  49   if (Settings::use_allocation_guard()) {
  50     MetaspaceGtestContext context;
  51     MetaspaceTestArena* arena = context.create_arena(Metaspace::StandardMetaspaceType);
  52     MetaWord* p = arena->allocate(10);
  53     MetaWord* p2 = arena->allocate(10);
  54     p[10] = (MetaWord)0x9345; // Overwriter
  55     // Checks should run in destructor:
  56     delete arena;
  57   } else {
  58     assert(false, "Corrupt block fake message to satisfy tests");
  59   }
  60 
  61 }
  62 
  63 #endif // ASSERT