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blockchainethereumsmart-contractssoliditysecurityprogram-analysissecurity-analysissymbolic-execution
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47 lines
2.0 KiB
47 lines
2.0 KiB
from mythril.disassembler.disassembly import Disassembly
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from mythril.laser.ethereum.state.environment import Environment
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from mythril.laser.ethereum.state.account import Account
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from mythril.laser.ethereum.state.machine_state import MachineState
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from mythril.laser.ethereum.state.global_state import GlobalState
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from mythril.laser.ethereum.state.world_state import WorldState
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from mythril.laser.ethereum.instructions import Instruction
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from mythril.laser.ethereum.transaction.transaction_models import MessageCallTransaction
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from mythril.support.support_utils import get_code_hash
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from mythril.laser.smt import symbol_factory
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def test_extcodehash_concrete():
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# Arrange
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world_state = WorldState()
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account = world_state.create_account(balance=10, address=101)
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account.code = Disassembly("60606040")
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world_state.create_account(balance=10, address=1000)
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environment = Environment(account, None, None, None, None, None)
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og_state = GlobalState(
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world_state, environment, None, MachineState(gas_limit=8000000)
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)
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og_state.transaction_stack.append(
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(MessageCallTransaction(world_state=WorldState(), gas_limit=8000000), None)
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)
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instruction = Instruction("extcodehash", dynamic_loader=None)
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# If account does not exist, return 0
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og_state.mstate.stack = [symbol_factory.BitVecVal(1, 256)]
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new_state = instruction.evaluate(og_state)[0]
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assert new_state.mstate.stack[-1] == 0
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# If account code does not exist, return hash of empty set.
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og_state.mstate.stack = [symbol_factory.BitVecVal(1000, 256)]
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new_state = instruction.evaluate(og_state)[0]
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assert (
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new_state.mstate.stack[-1]
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== "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
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)
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# If account code exists, return hash of the code.
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og_state.mstate.stack = [symbol_factory.BitVecVal(101, 256)]
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new_state = instruction.evaluate(og_state)[0]
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assert new_state.mstate.stack[-1] == get_code_hash("60606040")
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