1    :  // Copyright 2013 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/instrument/instrumenters/asan_instrumenter.h"
  16    :  
  17    :  #include "base/file_util.h"
  18    :  #include "base/logging.h"
  19    :  #include "syzygy/common/application.h"
  20    :  #include "syzygy/pe/image_filter.h"
  21    :  
  22    :  namespace instrument {
  23    :  namespace instrumenters {
  24    :  
  25    :  const char AsanInstrumenter::kAgentDllAsan[] = "asan_rtl.dll";
  26    :  
  27    :  AsanInstrumenter::AsanInstrumenter()
  28    :      : use_liveness_analysis_(false),
  29  E :        remove_redundant_checks_(false) {
  30  E :    agent_dll_ = kAgentDllAsan;
  31  E :  }
  32    :  
  33  E :  bool AsanInstrumenter::InstrumentImpl() {
  34    :    // Parse the filter if one was provided.
  35  E :    scoped_ptr<pe::ImageFilter> filter;
  36  E :    if (!filter_path_.empty()) {
  37  i :      filter.reset(new pe::ImageFilter());
  38  i :      if (!filter->LoadFromJSON(filter_path_)) {
  39  i :        LOG(ERROR) << "Failed to parse filter file: " << filter_path_.value();
  40  i :        return false;
  41    :      }
  42    :  
  43    :      // Ensure it is for the input module.
  44  i :      if (!filter->IsForModule(input_dll_path_)) {
  45  i :        LOG(ERROR) << "Filter does not match the input module.";
  46  i :        return false;
  47    :      }
  48    :    }
  49    :  
  50  E :    asan_transform_.reset(new instrument::transforms::AsanTransform());
  51  E :    asan_transform_->set_instrument_dll_name(agent_dll_);
  52  E :    asan_transform_->set_use_liveness_analysis(use_liveness_analysis_);
  53  E :    asan_transform_->set_remove_redundant_checks(remove_redundant_checks_);
  54    :  
  55    :    // Set up the filter if one was provided.
  56  E :    if (filter.get())
  57  i :      asan_transform_->set_filter(&filter->filter);
  58    :  
  59    :    // Set overwrite source range flag in the ASAN transform. The ASAN
  60    :    // transformation will overwrite the source range of created instructions to
  61    :    // the source range of corresponding instrumented instructions.
  62  E :    asan_transform_->set_debug_friendly(debug_friendly_);
  63    :  
  64  E :    relinker_->AppendTransform(asan_transform_.get());
  65    :  
  66  E :    return true;
  67  E :  }
  68    :  
  69    :  bool AsanInstrumenter::ParseAdditionalCommandLineArguments(
  70  E :      const CommandLine* command_line) {
  71    :    // Parse the additional command line arguments.
  72  E :    filter_path_ = command_line->GetSwitchValuePath("filter");
  73  E :    use_liveness_analysis_ = command_line->HasSwitch("use-liveness-analysis");
  74  E :    remove_redundant_checks_ = command_line->HasSwitch("remove-redundant-checks");
  75    :  
  76  E :    return true;
  77  E :  }
  78    :  
  79    :  }  // namespace instrumenters
  80    :  }  // namespace instrument