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/system_interceptors.h"
  16    :  
  17    :  #include <intrin.h>
  18    :  
  19    :  #include <algorithm>
  20    :  
  21    :  #include "base/logging.h"
  22    :  #include "syzygy/agent/asan/error_info.h"
  23    :  #include "syzygy/agent/asan/rtl_utils.h"
  24    :  #include "syzygy/agent/asan/runtime.h"
  25    :  #include "syzygy/agent/asan/shadow.h"
  26    :  
  27    :  namespace {
  28    :  
  29    :  using agent::asan::Shadow;
  30    :  using agent::asan::TestMemoryRange;
  31    :  
  32    :  // The global shadow memory that is used by the system interceptors.
  33    :  Shadow* system_interceptor_shadow_ = nullptr;
  34    :  
  35    :  // A callback that will be used in the functions interceptors once the call
  36    :  // to the intercepted function has been done. This is for testing purposes
  37    :  // only.
  38    :  InterceptorTailCallback interceptor_tail_callback = NULL;
  39    :  
  40    :  }  // namespace
  41    :  
  42    :  namespace agent {
  43    :  namespace asan {
  44    :  
  45  E :  Shadow* SetSystemInterceptorShadow(Shadow* shadow) {
  46  E :    Shadow* old_shadow = system_interceptor_shadow_;
  47  E :    system_interceptor_shadow_ = shadow;
  48  E :    return old_shadow;
  49  E :  }
  50    :  
  51    :  }  // namespace asan
  52    :  }  // namespace agent
  53    :  
  54    :  extern "C" {
  55    :  
  56  E :  void asan_SetInterceptorCallback(InterceptorTailCallback callback) {
  57  E :    interceptor_tail_callback = callback;
  58  E :  }
  59    :  
  60    :  // Bring in the implementation of the system interceptors that have been
  61    :  // automatically generated.
  62    :  #include "syzygy/agent/asan/gen/system_interceptors_impl.gen"
  63    :  
  64    :  }  // extern "C"