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128 lines
4.6 KiB
128 lines
4.6 KiB
/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __VTS_PROTO_FUZZER_MUTATOR_H_
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#define __VTS_PROTO_FUZZER_MUTATOR_H_
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#include <functional>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "ProtoFuzzerRunner.h"
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#include "ProtoFuzzerUtils.h"
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namespace android {
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namespace vts {
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namespace fuzzer {
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using BiasedRandomScalarGen = std::function<uint64_t(Random &rand)>;
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using Odds = std::pair<uint64_t, uint64_t>;
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using VarMutateFn = std::function<VarInstance(const VarInstance &)>;
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using VarRandomGenFn = std::function<VarInstance(const VarSpec &)>;
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using VarTransformFn = std::function<VariableSpecificationMessage(
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const VariableSpecificationMessage &)>;
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// Encapsulates heuristic strategy for biased mutation/random generation.
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struct ProtoFuzzerMutatorConfig {
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// Generates biased random scalars.
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BiasedRandomScalarGen scalar_bias_ = [](Random &rand) { return rand.Rand(); };
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// Used to decide if enum will be mutated/generated like a scalar.
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Odds enum_bias_ = {0, 1};
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// Odds that a function in an execution is mutated rather than regenerated.
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Odds func_mutated_ = {100, 1};
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// Default size used to randomly generate a vector.
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size_t default_vector_size_ = 64;
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// Default size used to randomly generate a string.
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size_t default_string_size_ = 16;
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};
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// Provides methods for mutation or random generation.
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class ProtoFuzzerMutator {
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public:
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ProtoFuzzerMutator(Random &, std::unordered_map<std::string, TypeSpec>,
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ProtoFuzzerMutatorConfig);
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// Generates a random ExecSpec.
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ExecSpec RandomGen(const IfaceDescTbl &, size_t);
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// Mutates in-place an ExecSpec.
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void Mutate(const IfaceDescTbl &, ExecSpec *);
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// Generates a random FuncSpec.
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FuncSpec RandomGen(const FuncSpec &);
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// Mutates a FuncSpec.
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FuncSpec Mutate(const FuncSpec &);
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// Generates a random VarInstance.
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VarInstance RandomGen(const VarSpec &);
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// Mutates a VarInstance.
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VarInstance Mutate(const VarInstance &);
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private:
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// Randomly selects an interface.
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const CompSpec *RandomSelectIface(const IfaceDescTbl &);
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// Used for mutation/random generation of VarInstance.
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VarInstance ArrayRandomGen(const VarSpec &);
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VarInstance ArrayMutate(const VarInstance &);
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VarInstance EnumRandomGen(const VarSpec &);
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VarInstance EnumMutate(const VarInstance &);
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VarInstance ScalarRandomGen(const VarSpec &);
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VarInstance ScalarMutate(const VarInstance &);
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VarInstance StringRandomGen(const VarSpec &);
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VarInstance StringMutate(const VarInstance &);
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VarInstance StructRandomGen(const VarSpec &);
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VarInstance StructMutate(const VarInstance &);
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VarInstance UnionRandomGen(const VarSpec &);
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VarInstance UnionMutate(const VarInstance &);
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VarInstance VectorRandomGen(const VarSpec &);
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VarInstance VectorMutate(const VarInstance &);
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// Used for mutation/random generation of ScalarData.
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ScalarData RandomGen(const ScalarData &, const std::string &);
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ScalarData Mutate(const ScalarData &, const string &);
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// Used for mutation/random generation of variables of fundamental data types
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// e.g. char, int, double.
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template <typename T>
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T RandomGen(T);
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template <typename T>
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T Mutate(T);
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bool RandomGen(bool);
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bool Mutate(bool);
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float Mutate(float);
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double Mutate(double);
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// Generates a random ASCII character.
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char RandomAsciiChar();
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// Looks up predefined type by name.
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const TypeSpec &FindPredefinedType(std::string);
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// 64-bit random number generator.
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Random &rand_;
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// Used to look up definition of a predefined type by its name.
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std::unordered_map<std::string, TypeSpec> predefined_types_;
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// Used to delegate mutation/random generation of VariableSpecifationMessage
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// of different VariableType to mutation/random delegation function for that
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// VariableType.
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std::unordered_map<VariableType, VarMutateFn> mutate_fns_;
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std::unordered_map<VariableType, VarRandomGenFn> random_gen_fns_;
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// Used for biased mutation/random generation of variables.
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ProtoFuzzerMutatorConfig mutator_config_;
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};
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} // namespace fuzzer
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} // namespace vts
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} // namespace android
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#endif // __VTS_PROTO_FUZZER_MUTATOR__
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