1    :  // Copyright 2014 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #include "syzygy/agent/asan/memory_notifiers/shadow_memory_notifier.h"
  16    :  
  17    :  #include "base/memory/scoped_ptr.h"
  18    :  #include "gtest/gtest.h"
  19    :  #include "syzygy/agent/asan/shadow.h"
  20    :  
  21    :  namespace agent {
  22    :  namespace asan {
  23    :  namespace memory_notifiers {
  24    :  
  25  E :  TEST(ShadowMemoryNotifierTest, ShadowStateTransitionsWithNotification) {
  26    :    // A buffer to use. This is allocated dynamically to ensure it has 8 byte
  27    :    // alignment.
  28  E :    const size_t kBufferSize = 1024;
  29  E :    scoped_ptr<uint8> buffer(new uint8[kBufferSize]);
  30    :  
  31    :    // Unpoison the memory so that the test starts from clean data.
  32  E :    Shadow::Unpoison(buffer.get(), kBufferSize);
  33    :  
  34  E :    ShadowMemoryNotifier n;
  35  E :    n.NotifyInternalUse(buffer.get(), kBufferSize);
  36  E :    EXPECT_FALSE(Shadow::IsAccessible(buffer.get()));
  37  E :    EXPECT_FALSE(Shadow::IsAccessible(buffer.get() + 10));
  38  E :    EXPECT_TRUE(Shadow::IsAccessible(buffer.get() + kBufferSize));
  39  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  40    :      EXPECT_EQ(kAsanMemoryMarker,
  41  E :                Shadow::GetShadowMarkerForAddress(buffer.get() + i));
  42  E :    }
  43    :  
  44  E :    n.NotifyFutureHeapUse(buffer.get(), kBufferSize);
  45  E :    EXPECT_FALSE(Shadow::IsAccessible(buffer.get()));
  46  E :    EXPECT_FALSE(Shadow::IsAccessible(buffer.get() + 10));
  47  E :    EXPECT_TRUE(Shadow::IsAccessible(buffer.get() + kBufferSize));
  48  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  49    :      EXPECT_EQ(kAsanReservedMarker,
  50  E :                Shadow::GetShadowMarkerForAddress(buffer.get() + i));
  51  E :    }
  52    :  
  53  E :    n.NotifyReturnedToOS(buffer.get(), kBufferSize);
  54  E :    EXPECT_TRUE(Shadow::IsAccessible(buffer.get()));
  55  E :    EXPECT_TRUE(Shadow::IsAccessible(buffer.get() + 10));
  56  E :    EXPECT_TRUE(Shadow::IsAccessible(buffer.get() + kBufferSize));
  57  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  58    :      EXPECT_EQ(kHeapAddressableMarker,
  59  E :                Shadow::GetShadowMarkerForAddress(buffer.get() + i));
  60  E :    }
  61    :  
  62    :    // Clean up behind ourselves.
  63  E :    Shadow::Unpoison(buffer.get(), kBufferSize);
  64  E :  }
  65    :  
  66    :  }  // namespace memory_notifiers
  67    :  }  // namespace asan
  68    :  }  // namespace agent