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[libFuzzer] more refactoring of the Mutator and adding tests to it 

llvm-svn: 243818
This commit is contained in:
Kostya Serebryany 2015-08-01 02:23:06 +00:00
parent 8ce7424e9c
commit 86a5fba71d
3 changed files with 133 additions and 26 deletions
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8
llvm/lib/Fuzzer/FuzzerInternal.h
View File

@ -33,7 +33,13 @@ void CopyFileToErr(const std::string &Path);
std::string DirPlusFile(const std::string &DirPath,
const std::string &FileName);
size_t Mutate_EraseByte(uint8_t *Data, size_t size, size_t MaxSize,
size_t Mutate_EraseByte(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);
size_t Mutate_InsertByte(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);
size_t Mutate_ChangeByte(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);
size_t Mutate_ChangeBit(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);
size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand);

41
llvm/lib/Fuzzer/FuzzerMutate.cpp
View File

@ -43,6 +43,30 @@ size_t Mutate_EraseByte(uint8_t *Data, size_t Size, size_t MaxSize,
return Size - 1;
}
size_t Mutate_InsertByte(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand) {
if (Size == MaxSize) return Size;
size_t Idx = Rand(Size + 1);
// Insert new value at Data[Idx].
memmove(Data + Idx + 1, Data + Idx, Size - Idx);
Data[Idx] = RandCh(Rand);
return Size + 1;
}
size_t Mutate_ChangeByte(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand) {
size_t Idx = Rand(Size);
Data[Idx] = RandCh(Rand);
return Size;
}
size_t Mutate_ChangeBit(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand) {
size_t Idx = Rand(Size);
Data[Idx] = FlipRandomBit(Data[Idx], Rand);
return Size;
}
// Mutates Data in place, returns new size.
size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
FuzzerRandomBase &Rand) {
@ -54,20 +78,11 @@ size_t Mutate(uint8_t *Data, size_t Size, size_t MaxSize,
return MaxSize;
}
assert(Size > 0);
size_t Idx = Rand(Size);
switch (Rand(3)) {
switch (Rand(4)) {
case 0: Size = Mutate_EraseByte(Data, Size, MaxSize, Rand); break;
case 1:
if (Size < MaxSize) {
// Insert new value at Data[Idx].
memmove(Data + Idx + 1, Data + Idx, Size - Idx);
Data[Idx] = RandCh(Rand);
}
Data[Idx] = RandCh(Rand);
break;
case 2:
Data[Idx] = FlipRandomBit(Data[Idx], Rand);
break;
case 1: Size = Mutate_InsertByte(Data, Size, MaxSize, Rand); break;
case 2: Size = Mutate_ChangeByte(Data, Size, MaxSize, Rand); break;
case 3: Size = Mutate_ChangeBit(Data, Size, MaxSize, Rand); break;
}
assert(Size > 0);
return Size;

110
llvm/lib/Fuzzer/test/FuzzerUnittest.cpp
View File

@ -90,19 +90,105 @@ void TestEraseByte(Mutator M, int NumIter) {
int FoundMask = 0;
for (int i = 0; i < NumIter; i++) {
uint8_t T[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
size_t NewSize = Mutate_EraseByte(T, sizeof(T), sizeof(T), Rand);
EXPECT_EQ(7UL, NewSize);
if (!memcmp(REM0, T, 7)) FoundMask |= 1 << 0;
if (!memcmp(REM1, T, 7)) FoundMask |= 1 << 1;
if (!memcmp(REM2, T, 7)) FoundMask |= 1 << 2;
if (!memcmp(REM3, T, 7)) FoundMask |= 1 << 3;
if (!memcmp(REM4, T, 7)) FoundMask |= 1 << 4;
if (!memcmp(REM5, T, 7)) FoundMask |= 1 << 5;
if (!memcmp(REM6, T, 7)) FoundMask |= 1 << 6;
if (!memcmp(REM7, T, 7)) FoundMask |= 1 << 7;
size_t NewSize = M(T, sizeof(T), sizeof(T), Rand);
if (NewSize == 7 && !memcmp(REM0, T, 7)) FoundMask |= 1 << 0;
if (NewSize == 7 && !memcmp(REM1, T, 7)) FoundMask |= 1 << 1;
if (NewSize == 7 && !memcmp(REM2, T, 7)) FoundMask |= 1 << 2;
if (NewSize == 7 && !memcmp(REM3, T, 7)) FoundMask |= 1 << 3;
if (NewSize == 7 && !memcmp(REM4, T, 7)) FoundMask |= 1 << 4;
if (NewSize == 7 && !memcmp(REM5, T, 7)) FoundMask |= 1 << 5;
if (NewSize == 7 && !memcmp(REM6, T, 7)) FoundMask |= 1 << 6;
if (NewSize == 7 && !memcmp(REM7, T, 7)) FoundMask |= 1 << 7;
}
EXPECT_EQ(FoundMask, 255);
}
TEST(FuzzerMutate, EraseByte1) { TestEraseByte(Mutate_EraseByte, 50); }
TEST(FuzzerMutate, EraseByte2) { TestEraseByte(Mutate, 100); }
TEST(FuzzerMutate, EraseByte1) { TestEraseByte(Mutate_EraseByte, 100); }
TEST(FuzzerMutate, EraseByte2) { TestEraseByte(Mutate, 1000); }
void TestInsertByte(Mutator M, int NumIter) {
FuzzerRandomLibc Rand(0);
int FoundMask = 0;
uint8_t INS0[8] = {0xF1, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66};
uint8_t INS1[8] = {0x00, 0xF2, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66};
uint8_t INS2[8] = {0x00, 0x11, 0xF3, 0x22, 0x33, 0x44, 0x55, 0x66};
uint8_t INS3[8] = {0x00, 0x11, 0x22, 0xF4, 0x33, 0x44, 0x55, 0x66};
uint8_t INS4[8] = {0x00, 0x11, 0x22, 0x33, 0xF5, 0x44, 0x55, 0x66};
uint8_t INS5[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0xF6, 0x55, 0x66};
uint8_t INS6[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0xF7, 0x66};
uint8_t INS7[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0xF8};
for (int i = 0; i < NumIter; i++) {
uint8_t T[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66};
size_t NewSize = M(T, 7, 8, Rand);
if (NewSize == 8 && !memcmp(INS0, T, 8)) FoundMask |= 1 << 0;
if (NewSize == 8 && !memcmp(INS1, T, 8)) FoundMask |= 1 << 1;
if (NewSize == 8 && !memcmp(INS2, T, 8)) FoundMask |= 1 << 2;
if (NewSize == 8 && !memcmp(INS3, T, 8)) FoundMask |= 1 << 3;
if (NewSize == 8 && !memcmp(INS4, T, 8)) FoundMask |= 1 << 4;
if (NewSize == 8 && !memcmp(INS5, T, 8)) FoundMask |= 1 << 5;
if (NewSize == 8 && !memcmp(INS6, T, 8)) FoundMask |= 1 << 6;
if (NewSize == 8 && !memcmp(INS7, T, 8)) FoundMask |= 1 << 7;
}
EXPECT_EQ(FoundMask, 255);
}
TEST(FuzzerMutate, InsertByte1) { TestInsertByte(Mutate_InsertByte, 1 << 15); }
TEST(FuzzerMutate, InsertByte2) { TestInsertByte(Mutate, 1 << 17); }
void TestChangeByte(Mutator M, int NumIter) {
FuzzerRandomLibc Rand(0);
int FoundMask = 0;
uint8_t CH0[8] = {0xF0, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH1[8] = {0x00, 0xF1, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH2[8] = {0x00, 0x11, 0xF2, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH3[8] = {0x00, 0x11, 0x22, 0xF3, 0x44, 0x55, 0x66, 0x77};
uint8_t CH4[8] = {0x00, 0x11, 0x22, 0x33, 0xF4, 0x55, 0x66, 0x77};
uint8_t CH5[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0xF5, 0x66, 0x77};
uint8_t CH6[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0xF5, 0x77};
uint8_t CH7[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0xF7};
for (int i = 0; i < NumIter; i++) {
uint8_t T[9] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
size_t NewSize = M(T, 8, 9, Rand);
if (NewSize == 8 && !memcmp(CH0, T, 8)) FoundMask |= 1 << 0;
if (NewSize == 8 && !memcmp(CH1, T, 8)) FoundMask |= 1 << 1;
if (NewSize == 8 && !memcmp(CH2, T, 8)) FoundMask |= 1 << 2;
if (NewSize == 8 && !memcmp(CH3, T, 8)) FoundMask |= 1 << 3;
if (NewSize == 8 && !memcmp(CH4, T, 8)) FoundMask |= 1 << 4;
if (NewSize == 8 && !memcmp(CH5, T, 8)) FoundMask |= 1 << 5;
if (NewSize == 8 && !memcmp(CH6, T, 8)) FoundMask |= 1 << 6;
if (NewSize == 8 && !memcmp(CH7, T, 8)) FoundMask |= 1 << 7;
}
EXPECT_EQ(FoundMask, 255);
}
TEST(FuzzerMutate, ChangeByte1) { TestChangeByte(Mutate_ChangeByte, 1 << 15); }
TEST(FuzzerMutate, ChangeByte2) { TestChangeByte(Mutate, 1 << 17); }
void TestChangeBit(Mutator M, int NumIter) {
FuzzerRandomLibc Rand(0);
int FoundMask = 0;
uint8_t CH0[8] = {0x01, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH1[8] = {0x00, 0x13, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH2[8] = {0x00, 0x11, 0x02, 0x33, 0x44, 0x55, 0x66, 0x77};
uint8_t CH3[8] = {0x00, 0x11, 0x22, 0x37, 0x44, 0x55, 0x66, 0x77};
uint8_t CH4[8] = {0x00, 0x11, 0x22, 0x33, 0x54, 0x55, 0x66, 0x77};
uint8_t CH5[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x54, 0x66, 0x77};
uint8_t CH6[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x76, 0x77};
uint8_t CH7[8] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0xF7};
for (int i = 0; i < NumIter; i++) {
uint8_t T[9] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77};
size_t NewSize = M(T, 8, 9, Rand);
if (NewSize == 8 && !memcmp(CH0, T, 8)) FoundMask |= 1 << 0;
if (NewSize == 8 && !memcmp(CH1, T, 8)) FoundMask |= 1 << 1;
if (NewSize == 8 && !memcmp(CH2, T, 8)) FoundMask |= 1 << 2;
if (NewSize == 8 && !memcmp(CH3, T, 8)) FoundMask |= 1 << 3;
if (NewSize == 8 && !memcmp(CH4, T, 8)) FoundMask |= 1 << 4;
if (NewSize == 8 && !memcmp(CH5, T, 8)) FoundMask |= 1 << 5;
if (NewSize == 8 && !memcmp(CH6, T, 8)) FoundMask |= 1 << 6;
if (NewSize == 8 && !memcmp(CH7, T, 8)) FoundMask |= 1 << 7;
}
EXPECT_EQ(FoundMask, 255);
}
TEST(FuzzerMutate, ChangeBit1) { TestChangeBit(Mutate_ChangeBit, 1 << 16); }
TEST(FuzzerMutate, ChangeBit2) { TestChangeBit(Mutate, 1 << 18); }