def execute_message_call(laser_evm, callee_address):
""" Executes a message call transaction from all open states """
open_states = laser_evm.open_states[:]
del laser_evm.open_states[:]
for open_world_state in open_states:
if open_world_state[callee_address].deleted:
debug("Can not execute dead contract, skipping.")
continue
next_transaction_id = get_next_transaction_id()
transaction = MessageCallTransaction(
world_state=open_world_state,
callee_account=open_world_state[callee_address],
caller=BitVec("caller{}".format(next_transaction_id), 256),
identifier=next_transaction_id,
call_data=Calldata(next_transaction_id),
gas_price=BitVec("gas_price{}".format(next_transaction_id), 256),
call_value=BitVec("call_value{}".format(next_transaction_id), 256),
origin=BitVec("origin{}".format(next_transaction_id), 256),
call_data_type=CalldataType.SYMBOLIC,
)
_setup_global_state_for_execution(laser_evm, transaction)
laser_evm.exec()
def execute_message_call(
laser_evm,
callee_address,
caller_address,
origin_address,
code,
data,
gas,
gas_price,
value,
):
""" Executes a message call transaction from all open states """
open_states = laser_evm.open_states[:]
del laser_evm.open_states[:]
for open_world_state in open_states:
next_transaction_id = get_next_transaction_id()
transaction = MessageCallTransaction(
identifier=next_transaction_id,
world_state=open_world_state,
callee_account=open_world_state[callee_address],
caller=caller_address,
call_data=Calldata(next_transaction_id, data),
gas_price=gas_price,
call_value=value,
origin=origin_address,
call_data_type=CalldataType.SYMBOLIC,
code=Disassembly(code),
)
_setup_global_state_for_execution(laser_evm, transaction)
laser_evm.exec()
def __init__(
self,
world_state,
callee_account,
caller,
call_data=None,
identifier=None,
gas_price=None,
call_value=None,
origin=None,
call_data_type=None,
code=None,
):
assert isinstance(world_state, WorldState)
self.id = identifier or get_next_transaction_id()
self.world_state = world_state
self.callee_account = callee_account
self.caller = caller
self.call_data = (Calldata(self.id, call_data) if
not isinstance(call_data, Calldata) else call_data)
self.gas_price = (BitVec("gasprice{}".format(identifier), 256)
if gas_price is None else gas_price)
self.call_value = (BitVec("callvalue{}".format(identifier), 256)
if call_value is None else call_value)
self.origin = (BitVec("origin{}".format(identifier), 256)
if origin is None else origin)
self.call_data_type = (BitVec("call_data_type{}".format(identifier),
256)
if call_data_type is None else call_data_type)
self.code = code
self.return_data = None
def test_concrete_calldata_uninitialized_index(starting_calldata):
# Arrange
calldata = Calldata(0, starting_calldata)
solver = Solver()
# Act
value = calldata[100]
value2 = calldata.get_word_at(200)
solver.add(calldata.constraints)
solver.check()
model = solver.model()
value = model.eval(value)
value2 = model.eval(value2)
# Assert
assert value == 0
assert value2 == 0
def get_call_data(
global_state: GlobalState,
memory_start: Union[int, ExprRef],
memory_size: Union[int, ExprRef],
):
"""
Gets call_data from the global_state
:param global_state: state to look in
:param memory_start: Start index
:param memory_size: Size
:return: Tuple containing: call_data array from memory or empty array if symbolic, type found
"""
state = global_state.mstate
transaction_id = "{}_internalcall".format(global_state.current_transaction.id)
try:
# TODO: This only allows for either fully concrete or fully symbolic calldata.
# Improve management of memory and callata to support a mix between both types.
calldata_from_mem = state.memory[
util.get_concrete_int(memory_start) : util.get_concrete_int(
memory_start + memory_size
)
]
i = 0
starting_calldata = []
while i < len(calldata_from_mem):
elem = calldata_from_mem[i]
if isinstance(elem, int):
starting_calldata.append(elem)
i += 1
else: # BitVec
for j in range(0, elem.size(), 8):
starting_calldata.append(Extract(j + 7, j, elem))
i += 1
call_data = Calldata(transaction_id, starting_calldata)
call_data_type = CalldataType.CONCRETE
logging.debug("Calldata: " + str(call_data))
except TypeError:
logging.debug("Unsupported symbolic calldata offset")
call_data_type = CalldataType.SYMBOLIC
call_data = Calldata("{}_internalcall".format(transaction_id))
return call_data, call_data_type
def __init__(
self,
world_state,
caller,
identifier=None,
callee_account=None,
code=None,
call_data=None,
gas_price=None,
call_value=None,
origin=None,
call_data_type=None,
):
assert isinstance(world_state, WorldState)
self.id = identifier or get_next_transaction_id()
self.world_state = world_state
# TODO: set correct balance for new account
self.callee_account = (
callee_account
if callee_account
else world_state.create_account(0, concrete_storage=True)
)
self.caller = caller
self.gas_price = (
BitVec("gasprice{}".format(identifier), 256)
if gas_price is None
else gas_price
)
self.call_value = (
BitVec("callvalue{}".format(identifier), 256)
if call_value is None
else call_value
)
self.origin = (
BitVec("origin{}".format(identifier), 256) if origin is None else origin
)
self.call_data_type = (
BitVec("call_data_type{}".format(identifier), 256)
if call_data_type is None
else call_data_type
)
self.call_data = (
Calldata(self.id, call_data)
if not isinstance(call_data, Calldata)
else call_data
)
self.origin = origin
self.code = code
self.return_data = None
def test_concrete_calldata_constrain_index():
# Arrange
calldata = Calldata(0, [1, 4, 7, 3, 7, 2, 9])
solver = Solver()
# Act
constraint = calldata[2] == 3
solver.add(calldata.constraints + [constraint])
result = solver.check()
# Assert
assert str(result) == "unsat"
def test_concrete_calldata_calldatasize():
# Arrange
calldata = Calldata(0, [1, 4, 7, 3, 7, 2, 9])
solver = Solver()
# Act
solver.check()
model = solver.model()
result = model.eval(calldata.calldatasize)
# Assert
assert result == 7
def test_concrete_calldata_constrain_index():
# Arrange
calldata = Calldata(0, [1, 4, 7, 3, 7, 2, 9])
solver = Solver()
# Act
value, calldata_constraints = calldata[2]
constraint = value == 3
solver.add([constraint] + calldata_constraints)
result = solver.check()
# Assert
assert str(result) == "unsat"
def test_concrete_calldata_constrain_index():
# Arrange
calldata = Calldata(0)
solver = Solver()
# Act
constraints = []
constraints.append(calldata[51] == 1)
constraints.append(calldata.calldatasize == 50)
solver.add(calldata.constraints + constraints)
result = solver.check()
# Assert
assert str(result) == "unsat"
def test_concrete_calldata_constrain_index():
# Arrange
calldata = Calldata(0)
mstate = MagicMock()
mstate.constraints = []
solver = Solver()
# Act
constraints = []
value, calldata_constraints = calldata[51]
constraints.append(value == 1)
constraints.append(calldata.calldatasize == 50)
solver.add(constraints + calldata_constraints)
result = solver.check()
# Assert
assert str(result) == "unsat"
def test_symbolic_calldata_constrain_index():
# Arrange
calldata = Calldata(0)
solver = Solver()
# Act
constraint = calldata[100] == 50
value = calldata[100]
solver.add(calldata.constraints + [constraint])
solver.check()
model = solver.model()
value = model.eval(value)
calldatasize = model.eval(calldata.calldatasize)
# Assert
assert value == 50
assert simplify(calldatasize >= 100)
