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fuzz_evm_test.go
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package mipsevm
import (
"bytes"
"math/rand"
"os"
"testing"
preimage "github.com/ethereum-optimism/optimism/op-preimage"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/stretchr/testify/require"
)
const syscallInsn = uint32(0x00_00_00_0c)
func FuzzStateSyscallBrk(f *testing.F) {
contracts, addrs := testContractsSetup(f)
f.Fuzz(func(t *testing.T, pc uint32, step uint64, preimageOffset uint32) {
pc = pc & 0xFF_FF_FF_FC // align PC
nextPC := pc + 4
state := &State{
Cpu: CpuScalars{
PC: pc,
NextPC: nextPC,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysBrk},
Step: step,
PreimageKey: common.Hash{},
PreimageOffset: preimageOffset,
}
state.Memory.SetMemory(pc, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
expectedRegisters := state.Registers
expectedRegisters[2] = 0x4000_0000
goState := NewInstrumentedState(state, nil, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, pc+4, state.Cpu.PC)
require.Equal(t, nextPC+4, state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, expectedRegisters, state.Registers)
require.Equal(t, step+1, state.Step)
require.Equal(t, common.Hash{}, state.PreimageKey)
require.Equal(t, preimageOffset, state.PreimageOffset)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateSyscallClone(f *testing.F) {
contracts, addrs := testContractsSetup(f)
f.Fuzz(func(t *testing.T, pc uint32, step uint64, preimageOffset uint32) {
pc = pc & 0xFF_FF_FF_FC // align PC
nextPC := pc + 4
state := &State{
Cpu: CpuScalars{
PC: pc,
NextPC: nextPC,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysClone},
Step: step,
PreimageOffset: preimageOffset,
}
state.Memory.SetMemory(pc, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
expectedRegisters := state.Registers
expectedRegisters[2] = 0x1
goState := NewInstrumentedState(state, nil, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, pc+4, state.Cpu.PC)
require.Equal(t, nextPC+4, state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, expectedRegisters, state.Registers)
require.Equal(t, step+1, state.Step)
require.Equal(t, common.Hash{}, state.PreimageKey)
require.Equal(t, preimageOffset, state.PreimageOffset)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateSyscallMmap(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, addr uint32, siz uint32, heap uint32) {
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: heap,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysMmap, 4: addr, 5: siz},
Step: step,
PreimageOffset: 0,
}
state.Memory.SetMemory(0, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
preStateRegisters := state.Registers
goState := NewInstrumentedState(state, nil, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, uint64(1), state.Step)
require.Equal(t, common.Hash{}, state.PreimageKey)
require.Equal(t, uint32(0), state.PreimageOffset)
if addr == 0 {
expectedRegisters := preStateRegisters
expectedRegisters[2] = heap
require.Equal(t, expectedRegisters, state.Registers)
sizAlign := siz
if sizAlign&PageAddrMask != 0 { // adjust size to align with page size
sizAlign = siz + PageSize - (siz & PageAddrMask)
}
require.Equal(t, uint32(heap+sizAlign), state.Heap)
} else {
expectedRegisters := preStateRegisters
expectedRegisters[2] = addr
require.Equal(t, expectedRegisters, state.Registers)
require.Equal(t, uint32(heap), state.Heap)
}
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateSyscallExitGroup(f *testing.F) {
contracts, addrs := testContractsSetup(f)
f.Fuzz(func(t *testing.T, exitCode uint8, pc uint32, step uint64) {
pc = pc & 0xFF_FF_FF_FC // align PC
nextPC := pc + 4
state := &State{
Cpu: CpuScalars{
PC: pc,
NextPC: nextPC,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysExitGroup, 4: uint32(exitCode)},
Step: step,
PreimageOffset: 0,
}
state.Memory.SetMemory(pc, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
preStateRegisters := state.Registers
goState := NewInstrumentedState(state, nil, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, pc, state.Cpu.PC)
require.Equal(t, nextPC, state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(exitCode), state.ExitCode)
require.Equal(t, true, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, preStateRegisters, state.Registers)
require.Equal(t, step+1, state.Step)
require.Equal(t, common.Hash{}, state.PreimageKey)
require.Equal(t, uint32(0), state.PreimageOffset)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateSyscallFcntl(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, fd uint32, cmd uint32) {
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysFcntl, 4: fd, 5: cmd},
Step: step,
PreimageOffset: 0,
}
state.Memory.SetMemory(0, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
preStateRegisters := state.Registers
goState := NewInstrumentedState(state, nil, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, uint64(1), state.Step)
require.Equal(t, common.Hash{}, state.PreimageKey)
require.Equal(t, uint32(0), state.PreimageOffset)
if cmd == 3 {
expectedRegisters := preStateRegisters
switch fd {
case fdStdin, fdPreimageRead, fdHintRead:
expectedRegisters[2] = 0
case fdStdout, fdStderr, fdPreimageWrite, fdHintWrite:
expectedRegisters[2] = 1
default:
expectedRegisters[2] = 0xFF_FF_FF_FF
expectedRegisters[7] = MipsEBADF
}
require.Equal(t, expectedRegisters, state.Registers)
} else {
expectedRegisters := preStateRegisters
expectedRegisters[2] = 0xFF_FF_FF_FF
expectedRegisters[7] = MipsEINVAL
require.Equal(t, expectedRegisters, state.Registers)
}
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateHintRead(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, addr uint32, count uint32) {
preimageData := []byte("hello world")
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysRead, 4: fdHintRead, 5: addr, 6: count},
Step: step,
PreimageKey: preimage.Keccak256Key(crypto.Keccak256Hash(preimageData)).PreimageKey(),
PreimageOffset: 0,
}
state.Memory.SetMemory(0, syscallInsn)
preStatePreimageKey := state.PreimageKey
preStateRoot := state.Memory.MerkleRoot()
expectedRegisters := state.Registers
expectedRegisters[2] = count
oracle := staticOracle(t, preimageData) // only used for hinting
goState := NewInstrumentedState(state, oracle, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, uint64(1), state.Step)
require.Equal(t, preStatePreimageKey, state.PreimageKey)
require.Equal(t, expectedRegisters, state.Registers)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStatePreimageRead(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, addr uint32, count uint32, preimageOffset uint32) {
preimageData := []byte("hello world")
if preimageOffset >= uint32(len(preimageData)) {
t.SkipNow()
}
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysRead, 4: fdPreimageRead, 5: addr, 6: count},
Step: step,
PreimageKey: preimage.Keccak256Key(crypto.Keccak256Hash(preimageData)).PreimageKey(),
PreimageOffset: preimageOffset,
}
state.Memory.SetMemory(0, syscallInsn)
preStatePreimageKey := state.PreimageKey
preStateRoot := state.Memory.MerkleRoot()
writeLen := count
if writeLen > 4 {
writeLen = 4
}
if preimageOffset+writeLen > uint32(8+len(preimageData)) {
writeLen = uint32(8+len(preimageData)) - preimageOffset
}
oracle := staticOracle(t, preimageData)
goState := NewInstrumentedState(state, oracle, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.True(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
if writeLen > 0 {
// Memory may be unchanged if we're writing the first zero-valued 7 bytes of the pre-image.
//require.NotEqual(t, preStateRoot, state.Memory.MerkleRoot())
require.Greater(t, state.PreimageOffset, preimageOffset)
} else {
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, state.PreimageOffset, preimageOffset)
}
require.Equal(t, uint64(1), state.Step)
require.Equal(t, preStatePreimageKey, state.PreimageKey)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStateHintWrite(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, addr uint32, count uint32, randSeed int64) {
preimageData := []byte("hello world")
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysWrite, 4: fdHintWrite, 5: addr, 6: count},
Step: step,
PreimageKey: preimage.Keccak256Key(crypto.Keccak256Hash(preimageData)).PreimageKey(),
PreimageOffset: 0,
LastHint: nil,
}
// Set random data at the target memory range
randBytes, err := randomBytes(randSeed, count)
require.NoError(t, err)
err = state.Memory.SetMemoryRange(addr, bytes.NewReader(randBytes))
require.NoError(t, err)
// Set syscall instruction
state.Memory.SetMemory(0, syscallInsn)
preStatePreimageKey := state.PreimageKey
preStateRoot := state.Memory.MerkleRoot()
expectedRegisters := state.Registers
expectedRegisters[2] = count
oracle := staticOracle(t, preimageData) // only used for hinting
goState := NewInstrumentedState(state, oracle, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, uint64(1), state.Step)
require.Equal(t, preStatePreimageKey, state.PreimageKey)
require.Equal(t, expectedRegisters, state.Registers)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func FuzzStatePreimageWrite(f *testing.F) {
contracts, addrs := testContractsSetup(f)
step := uint64(0)
f.Fuzz(func(t *testing.T, addr uint32, count uint32) {
preimageData := []byte("hello world")
state := &State{
Cpu: CpuScalars{
PC: 0,
NextPC: 4,
LO: 0,
HI: 0,
},
Heap: 0,
ExitCode: 0,
Exited: false,
Memory: NewMemory(),
Registers: [32]uint32{2: sysWrite, 4: fdPreimageWrite, 5: addr, 6: count},
Step: 0,
PreimageKey: preimage.Keccak256Key(crypto.Keccak256Hash(preimageData)).PreimageKey(),
PreimageOffset: 128,
}
state.Memory.SetMemory(0, syscallInsn)
preStateRoot := state.Memory.MerkleRoot()
expectedRegisters := state.Registers
sz := 4 - (addr & 0x3)
if sz < count {
count = sz
}
expectedRegisters[2] = count
oracle := staticOracle(t, preimageData)
goState := NewInstrumentedState(state, oracle, os.Stdout, os.Stderr)
stepWitness, err := goState.Step(true)
require.NoError(t, err)
require.False(t, stepWitness.HasPreimage())
require.Equal(t, uint32(4), state.Cpu.PC)
require.Equal(t, uint32(8), state.Cpu.NextPC)
require.Equal(t, uint32(0), state.Cpu.LO)
require.Equal(t, uint32(0), state.Cpu.HI)
require.Equal(t, uint32(0), state.Heap)
require.Equal(t, uint8(0), state.ExitCode)
require.Equal(t, false, state.Exited)
require.Equal(t, preStateRoot, state.Memory.MerkleRoot())
require.Equal(t, uint64(1), state.Step)
require.Equal(t, uint32(0), state.PreimageOffset)
require.Equal(t, expectedRegisters, state.Registers)
evm := NewMIPSEVM(contracts, addrs)
evmPost := evm.Step(t, stepWitness, step)
goPost, _ := goState.state.EncodeWitness()
require.Equal(t, hexutil.Bytes(goPost).String(), hexutil.Bytes(evmPost).String(),
"mipsevm produced different state than EVM")
})
}
func randomBytes(seed int64, length uint32) ([]byte, error) {
r := rand.New(rand.NewSource(seed))
randBytes := make([]byte, length)
if _, err := r.Read(randBytes); err != nil {
return nil, err
}
return randBytes, nil
}