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    :  namespace {
  26    :  
  27    :  class ShadowMemoryNotifierTest : public testing::Test {
  28    :   public:
  29  E :    virtual void SetUp() override {
  30  E :      shadow_.SetUp();
  31  E :    }
  32    :  
  33  E :    virtual void TearDown() override {
  34  E :      shadow_.TearDown();
  35  E :    }
  36    :  
  37    :    Shadow shadow_;
  38    :  };
  39    :  
  40    :  }  // namespace
  41    :  
  42  E :  TEST_F(ShadowMemoryNotifierTest, ShadowStateTransitionsWithNotification) {
  43    :    // A buffer to use. This is allocated dynamically to ensure it has 8 byte
  44    :    // alignment.
  45  E :    const size_t kBufferSize = 1024;
  46  E :    scoped_ptr<uint8> buffer(new uint8[kBufferSize]);
  47    :  
  48  E :    ShadowMemoryNotifier n(&shadow_);
  49  E :    n.NotifyInternalUse(buffer.get(), kBufferSize);
  50  E :    EXPECT_FALSE(shadow_.IsAccessible(buffer.get()));
  51  E :    EXPECT_FALSE(shadow_.IsAccessible(buffer.get() + 10));
  52  E :    EXPECT_TRUE(shadow_.IsAccessible(buffer.get() + kBufferSize));
  53  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  54    :      EXPECT_EQ(kAsanMemoryMarker,
  55  E :                shadow_.GetShadowMarkerForAddress(buffer.get() + i));
  56  E :    }
  57    :  
  58  E :    n.NotifyFutureHeapUse(buffer.get(), kBufferSize);
  59  E :    EXPECT_FALSE(shadow_.IsAccessible(buffer.get()));
  60  E :    EXPECT_FALSE(shadow_.IsAccessible(buffer.get() + 10));
  61  E :    EXPECT_TRUE(shadow_.IsAccessible(buffer.get() + kBufferSize));
  62  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  63    :      EXPECT_EQ(kAsanReservedMarker,
  64  E :                shadow_.GetShadowMarkerForAddress(buffer.get() + i));
  65  E :    }
  66    :  
  67  E :    n.NotifyReturnedToOS(buffer.get(), kBufferSize);
  68  E :    EXPECT_TRUE(shadow_.IsAccessible(buffer.get()));
  69  E :    EXPECT_TRUE(shadow_.IsAccessible(buffer.get() + 10));
  70  E :    EXPECT_TRUE(shadow_.IsAccessible(buffer.get() + kBufferSize));
  71  E :    for (size_t i = 0; i < kBufferSize; ++i) {
  72    :      EXPECT_EQ(kHeapAddressableMarker,
  73  E :                shadow_.GetShadowMarkerForAddress(buffer.get() + i));
  74  E :    }
  75    :  
  76  E :    EXPECT_TRUE(shadow_.IsClean());
  77  E :  }
  78    :  
  79    :  }  // namespace memory_notifiers
  80    :  }  // namespace asan
  81    :  }  // namespace agent