1    :  // Copyright 2015 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    :  // Provides an actual static shadow memory. This is intended for use with
  16    :  // runtimes that can't patch the memory interceptor probes and thus need a
  17    :  // hardcoded address for the shadow memory array.
  18    :  //
  19    :  // Intended for use in syzyasan_rtl.dll.
  20    :  
  21    :  #include "syzygy/agent/asan/shadow.h"
  22    :  
  23  m :  namespace {
  24    :  
  25    :  // One shadow byte per group of kShadowRatio bytes in a 2G address space.
  26    :  // NOTE: This is dependent on the process NOT being large address aware.
  27  m :  static const size_t kShadowSize = 1 << (31 - agent::asan::kShadowRatioLog);
  28    :  
  29  m :  }  // namespace
  30    :  
  31  m :  extern "C" {
  32  m :  size_t asan_memory_interceptors_shadow_memory_size = kShadowSize;
  33  m :  uint8_t asan_memory_interceptors_shadow_memory[kShadowSize] = {};
  34  m :  }