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    :  #ifndef SYZYGY_REFINERY_VALIDATORS_VFTABLE_PTR_VALIDATOR_H_
  16    :  #define SYZYGY_REFINERY_VALIDATORS_VFTABLE_PTR_VALIDATOR_H_
  17    :  
  18    :  #include "base/macros.h"
  19    :  #include "base/containers/hash_tables.h"
  20    :  #include "base/memory/ref_counted.h"
  21    :  #include "syzygy/refinery/core/address.h"
  22    :  #include "syzygy/refinery/symbols/symbol_provider.h"
  23    :  #include "syzygy/refinery/types/typed_data.h"
  24    :  #include "syzygy/refinery/validators/validator.h"
  25    :  
  26  m :  namespace refinery {
  27    :  
  28    :  // A validator for vftable ptr values. This simple implementation validates
  29    :  // that an object's vftable ptr is within the valid set for the process.
  30    :  // TODO(manzagop): tighter checking of a vftable ptr's possible values.
  31  m :  class VftablePtrValidator : public Validator {
  32  m :   public:
  33    :    // TODO(manzagop): Is this a validator? Take in a symbol provider?
  34  m :    explicit VftablePtrValidator(scoped_refptr<SymbolProvider> symbol_provider);
  35    :  
  36  m :    ValidationResult Validate(ProcessState* process_state,
  37  m :                              ValidationReport* report) override;
  38    :  
  39  m :   protected:
  40    :    // Retrieves the set of vftable virtual addresses for @p process_state.
  41    :    // @param process_state the process_state.
  42    :    // @param vftable_vas on success, contains zero or more addresses.
  43    :    // @returns true on success, false on failure.
  44  m :    static bool GetVFTableVAs(
  45  m :        ProcessState* process_state,
  46  m :        SymbolProvider* symbol_provider,
  47  m :        base::hash_set<Address>* vftable_vas);
  48    :  
  49  m :   private:
  50  m :    bool ValidateTypedData(const TypedData& typed_data,
  51  m :                           const base::hash_set<RelativeAddress>& vftable_vas,
  52  m :                           ValidationReport* report);
  53    :  
  54  m :    scoped_refptr<SymbolProvider> symbol_provider_;
  55    :  
  56  m :    DISALLOW_COPY_AND_ASSIGN(VftablePtrValidator);
  57  m :  };
  58    :  
  59  m :  }  // namespace refinery
  60    :  
  61    :  #endif  // SYZYGY_REFINERY_VALIDATORS_VFTABLE_PTR_VALIDATOR_H_