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279 lines
9.4 KiB
C++
279 lines
9.4 KiB
C++
//===- FuzzerMutate.cpp - Mutate a test input -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// Mutate a test input.
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//===----------------------------------------------------------------------===//
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#include <cstring>
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#include "FuzzerInternal.h"
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#include <algorithm>
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namespace fuzzer {
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struct Mutator {
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size_t (MutationDispatcher::*Fn)(uint8_t *Data, size_t Size, size_t Max);
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const char *Name;
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};
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struct DictionaryEntry {
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Unit Word;
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size_t PositionHint;
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};
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struct MutationDispatcher::Impl {
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std::vector<DictionaryEntry> ManualDictionary;
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std::vector<DictionaryEntry> AutoDictionary;
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std::vector<Mutator> Mutators;
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std::vector<Mutator> CurrentMutatorSequence;
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std::vector<DictionaryEntry> CurrentDictionaryEntrySequence;
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const std::vector<Unit> *Corpus = nullptr;
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FuzzerRandomBase &Rand;
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void Add(Mutator M) { Mutators.push_back(M); }
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Impl(FuzzerRandomBase &Rand) : Rand(Rand) {
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Add({&MutationDispatcher::Mutate_EraseByte, "EraseByte"});
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Add({&MutationDispatcher::Mutate_InsertByte, "InsertByte"});
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Add({&MutationDispatcher::Mutate_ChangeByte, "ChangeByte"});
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Add({&MutationDispatcher::Mutate_ChangeBit, "ChangeBit"});
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Add({&MutationDispatcher::Mutate_ShuffleBytes, "ShuffleBytes"});
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Add({&MutationDispatcher::Mutate_ChangeASCIIInteger, "ChangeASCIIInt"});
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Add({&MutationDispatcher::Mutate_CrossOver, "CrossOver"});
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Add({&MutationDispatcher::Mutate_AddWordFromManualDictionary,
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"AddFromManualDict"});
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Add({&MutationDispatcher::Mutate_AddWordFromAutoDictionary,
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"AddFromAutoDict"});
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}
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void SetCorpus(const std::vector<Unit> *Corpus) { this->Corpus = Corpus; }
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size_t AddWordFromDictionary(const std::vector<DictionaryEntry> &D,
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uint8_t *Data, size_t Size, size_t MaxSize);
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};
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static char FlipRandomBit(char X, FuzzerRandomBase &Rand) {
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int Bit = Rand(8);
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char Mask = 1 << Bit;
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char R;
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if (X & (1 << Bit))
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R = X & ~Mask;
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else
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R = X | Mask;
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assert(R != X);
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return R;
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}
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static char RandCh(FuzzerRandomBase &Rand) {
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if (Rand.RandBool()) return Rand(256);
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const char *Special = "!*'();:@&=+$,/?%#[]123ABCxyz-`~.";
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return Special[Rand(sizeof(Special) - 1)];
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}
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size_t MutationDispatcher::Mutate_ShuffleBytes(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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assert(Size);
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size_t ShuffleAmount =
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Rand(std::min(Size, (size_t)8)) + 1; // [1,8] and <= Size.
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size_t ShuffleStart = Rand(Size - ShuffleAmount);
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assert(ShuffleStart + ShuffleAmount <= Size);
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std::random_shuffle(Data + ShuffleStart, Data + ShuffleStart + ShuffleAmount,
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Rand);
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return Size;
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}
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size_t MutationDispatcher::Mutate_EraseByte(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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assert(Size);
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if (Size == 1) return 0;
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size_t Idx = Rand(Size);
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// Erase Data[Idx].
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memmove(Data + Idx, Data + Idx + 1, Size - Idx - 1);
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return Size - 1;
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}
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size_t MutationDispatcher::Mutate_InsertByte(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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if (Size == MaxSize) return 0;
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size_t Idx = Rand(Size + 1);
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// Insert new value at Data[Idx].
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memmove(Data + Idx + 1, Data + Idx, Size - Idx);
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Data[Idx] = RandCh(Rand);
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return Size + 1;
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}
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size_t MutationDispatcher::Mutate_ChangeByte(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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size_t Idx = Rand(Size);
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Data[Idx] = RandCh(Rand);
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return Size;
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}
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size_t MutationDispatcher::Mutate_ChangeBit(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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size_t Idx = Rand(Size);
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Data[Idx] = FlipRandomBit(Data[Idx], Rand);
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return Size;
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}
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size_t MutationDispatcher::Mutate_AddWordFromManualDictionary(uint8_t *Data,
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size_t Size,
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size_t MaxSize) {
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return MDImpl->AddWordFromDictionary(MDImpl->ManualDictionary, Data, Size,
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MaxSize);
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}
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size_t MutationDispatcher::Mutate_AddWordFromAutoDictionary(uint8_t *Data,
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size_t Size,
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size_t MaxSize) {
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return MDImpl->AddWordFromDictionary(MDImpl->AutoDictionary, Data, Size,
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MaxSize);
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}
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size_t MutationDispatcher::Impl::AddWordFromDictionary(
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const std::vector<DictionaryEntry> &D, uint8_t *Data, size_t Size,
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size_t MaxSize) {
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if (D.empty()) return 0;
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const DictionaryEntry &DE = D[Rand(D.size())];
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const Unit &Word = DE.Word;
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size_t PositionHint = DE.PositionHint;
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bool UsePositionHint = PositionHint != std::numeric_limits<size_t>::max() &&
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PositionHint + Word.size() < Size && Rand.RandBool();
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if (Rand.RandBool()) { // Insert Word.
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if (Size + Word.size() > MaxSize) return 0;
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size_t Idx = UsePositionHint ? PositionHint : Rand(Size + 1);
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memmove(Data + Idx + Word.size(), Data + Idx, Size - Idx);
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memcpy(Data + Idx, Word.data(), Word.size());
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Size += Word.size();
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} else { // Overwrite some bytes with Word.
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if (Word.size() > Size) return 0;
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size_t Idx = UsePositionHint ? PositionHint : Rand(Size - Word.size());
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memcpy(Data + Idx, Word.data(), Word.size());
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}
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CurrentDictionaryEntrySequence.push_back(DE);
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return Size;
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}
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size_t MutationDispatcher::Mutate_ChangeASCIIInteger(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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size_t B = Rand(Size);
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while (B < Size && !isdigit(Data[B])) B++;
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if (B == Size) return 0;
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size_t E = B;
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while (E < Size && isdigit(Data[E])) E++;
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assert(B < E);
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// now we have digits in [B, E).
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// strtol and friends don't accept non-zero-teminated data, parse it manually.
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uint64_t Val = Data[B] - '0';
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for (size_t i = B + 1; i < E; i++)
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Val = Val * 10 + Data[i] - '0';
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// Mutate the integer value.
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switch(Rand(5)) {
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case 0: Val++; break;
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case 1: Val--; break;
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case 2: Val /= 2; break;
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case 3: Val *= 2; break;
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case 4: Val = Rand(Val * Val); break;
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default: assert(0);
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}
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// Just replace the bytes with the new ones, don't bother moving bytes.
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for (size_t i = B; i < E; i++) {
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size_t Idx = E + B - i - 1;
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assert(Idx >= B && Idx < E);
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Data[Idx] = (Val % 10) + '0';
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Val /= 10;
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}
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return Size;
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}
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size_t MutationDispatcher::Mutate_CrossOver(uint8_t *Data, size_t Size,
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size_t MaxSize) {
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auto Corpus = MDImpl->Corpus;
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if (!Corpus || Corpus->size() < 2 || Size == 0) return 0;
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size_t Idx = Rand(Corpus->size());
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const Unit &Other = (*Corpus)[Idx];
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if (Other.empty()) return 0;
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Unit U(MaxSize);
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size_t NewSize =
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CrossOver(Data, Size, Other.data(), Other.size(), U.data(), U.size());
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assert(NewSize > 0 && "CrossOver returned empty unit");
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assert(NewSize <= MaxSize && "CrossOver returned overisized unit");
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memcpy(Data, U.data(), NewSize);
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return NewSize;
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}
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void MutationDispatcher::StartMutationSequence() {
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MDImpl->CurrentMutatorSequence.clear();
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MDImpl->CurrentDictionaryEntrySequence.clear();
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}
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void MutationDispatcher::PrintMutationSequence() {
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Printf("MS: %zd ", MDImpl->CurrentMutatorSequence.size());
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for (auto M : MDImpl->CurrentMutatorSequence)
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Printf("%s-", M.Name);
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if (!MDImpl->CurrentDictionaryEntrySequence.empty()) {
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Printf(" DE: ");
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for (auto DE : MDImpl->CurrentDictionaryEntrySequence) {
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Printf("\"");
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PrintASCII(DE.Word, "\"-");
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}
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}
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}
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// Mutates Data in place, returns new size.
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size_t MutationDispatcher::Mutate(uint8_t *Data, size_t Size, size_t MaxSize) {
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assert(MaxSize > 0);
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assert(Size <= MaxSize);
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if (Size == 0) {
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for (size_t i = 0; i < MaxSize; i++)
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Data[i] = RandCh(Rand);
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return MaxSize;
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}
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assert(Size > 0);
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// Some mutations may fail (e.g. can't insert more bytes if Size == MaxSize),
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// in which case they will return 0.
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// Try several times before returning un-mutated data.
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for (int Iter = 0; Iter < 10; Iter++) {
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size_t MutatorIdx = Rand(MDImpl->Mutators.size());
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auto M = MDImpl->Mutators[MutatorIdx];
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size_t NewSize = (this->*(M.Fn))(Data, Size, MaxSize);
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if (NewSize) {
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MDImpl->CurrentMutatorSequence.push_back(M);
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return NewSize;
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}
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}
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return Size;
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}
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void MutationDispatcher::SetCorpus(const std::vector<Unit> *Corpus) {
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MDImpl->SetCorpus(Corpus);
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}
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void MutationDispatcher::AddWordToManualDictionary(const Unit &Word) {
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MDImpl->ManualDictionary.push_back(
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{Word, std::numeric_limits<size_t>::max()});
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}
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void MutationDispatcher::AddWordToAutoDictionary(const Unit &Word,
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size_t PositionHint) {
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static const size_t kMaxAutoDictSize = 1 << 14;
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if (MDImpl->AutoDictionary.size() >= kMaxAutoDictSize) return;
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MDImpl->AutoDictionary.push_back({Word, PositionHint});
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}
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void MutationDispatcher::ClearAutoDictionary() {
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MDImpl->AutoDictionary.clear();
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}
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MutationDispatcher::MutationDispatcher(FuzzerRandomBase &Rand) : Rand(Rand) {
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MDImpl = new Impl(Rand);
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}
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MutationDispatcher::~MutationDispatcher() { delete MDImpl; }
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} // namespace fuzzer
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