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    :  // Declares a helper function for in-place patching the memory interceptors
  16    :  // to point to a new shadow memory array.
  17    :  
  18    :  #ifndef SYZYGY_AGENT_ASAN_MEMORY_INTERCEPTORS_PATCHER_H_
  19    :  #define SYZYGY_AGENT_ASAN_MEMORY_INTERCEPTORS_PATCHER_H_
  20    :  
  21    :  #include <windows.h>
  22    :  #include <cstdint>
  23    :  
  24  m :  namespace agent {
  25  m :  namespace asan {
  26    :  
  27    :  // Patches the memory interceptors found in the .probes section of the current
  28    :  // module.
  29    :  // @param new_shadow_memory The shadow memory that is to be patched into the
  30    :  //     probes.
  31    :  // @param old_shadow_memory The shadow memory that the probe should currently
  32    :  //     be referring to.
  33    :  // @note This function is BYOL - bring your own locking.
  34    :  // @note Patching is inherently racy. It's wise to call this function from
  35    :  //     under a lock that prevents concurrent patching on the same module, and
  36    :  //     the caller must guarantee that the module is not unloaded during
  37    :  //     patching.
  38    :  // @returns true on success, false otherwise. Logs verbosely on failure.
  39  m :  bool PatchMemoryInterceptorShadowReferences(const uint8_t* old_shadow_memory,
  40  m :                                              const uint8_t* new_shadow_memory);
  41    :  
  42  m :  }  // namespace asan
  43  m :  }  // namespace agent
  44    :  
  45    :  #endif  // SYZYGY_AGENT_ASAN_MEMORY_INTERCEPTORS_PATCHER_H_