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160 | @pytest.mark.valid_from("Cancun")
@pytest.mark.parametrize("call_type", [Op.CALL, Op.CALLCODE, Op.DELEGATECALL, Op.STATICCALL])
@pytest.mark.parametrize("call_return", [Op.RETURN, Op.REVERT, Om.OOG])
@pytest.mark.parametrize("call_dest_type", [CallDestType.REENTRANCY, CallDestType.EXTERNAL_CALL])
def test_tload_reentrancy(
state_test: StateTestFiller,
pre: Alloc,
call_type: Op,
call_return: Op,
call_dest_type: CallDestType,
):
"""
Ported .json vectors:
(05_tloadReentrancyFiller.yml)
Reentrant calls access the same transient storage
"""
tload_value = 44
empty_value = 0
# Storage variables
slot_tload_in_subcall_result = 1
slot_tload_after_subcall_result = 2
slot_subcall_worked = 3
slot_code_worked = 4
# Function names
do_load = 1
do_reenter = 2
call_dest_address: Bytecode | Address
call_dest_address = Op.ADDRESS()
def make_call(call_type: Op) -> Bytecode:
if call_type == Op.DELEGATECALL or call_type == Op.STATICCALL:
return call_type(Op.GAS(), call_dest_address, 0, 32, 32, 32)
else:
return call_type(Op.GAS(), call_dest_address, 0, 0, 32, 32, 32)
subcall_code = Op.MSTORE(0, Op.TLOAD(0)) + call_return(0, 32)
address_code = pre.deploy_contract(
balance=0,
code=subcall_code,
storage={},
)
if call_dest_type == CallDestType.EXTERNAL_CALL:
call_dest_address = address_code
address_to = pre.deploy_contract(
balance=1_000_000_000_000_000_000,
code=Switch(
cases=[
Case(
condition=Op.EQ(Op.CALLDATALOAD(0), do_load),
action=subcall_code,
),
Case(
condition=Op.EQ(Op.CALLDATALOAD(0), do_reenter),
action=Op.TSTORE(0, tload_value)
+ Op.MSTORE(0, do_load)
+ Op.MSTORE(32, 0xFF)
+ Op.SSTORE(slot_subcall_worked, make_call(call_type))
+ Op.SSTORE(slot_tload_in_subcall_result, Op.MLOAD(32))
+ Op.SSTORE(slot_tload_after_subcall_result, Op.TLOAD(0))
+ Op.SSTORE(slot_code_worked, 1),
),
],
default_action=None,
),
storage={
slot_tload_in_subcall_result: 0xFF,
slot_tload_after_subcall_result: 0xFF,
slot_subcall_worked: 0xFF,
slot_code_worked: 0xFF,
},
)
if call_dest_type == CallDestType.REENTRANCY:
post = {
address_to: Account(
storage={
slot_code_worked: 1,
# if call OOG, we fail to obtain the result
slot_tload_in_subcall_result: 0xFF if call_return == Om.OOG else tload_value,
slot_tload_after_subcall_result: tload_value,
slot_subcall_worked: (
0 if call_return == Op.REVERT or call_return == Om.OOG else 1
),
}
)
}
else:
post = {
address_to: Account(
storage={
slot_code_worked: 1,
slot_tload_in_subcall_result: (
0xFF # if call OOG, we fail to obtain the result
if call_return == Om.OOG
# else delegate and callcode are working in the same context so tload works
else (
tload_value
if call_type == Op.DELEGATECALL or call_type == Op.CALLCODE
else empty_value
)
),
# no subcall errors can change the tload result
slot_tload_after_subcall_result: 44,
slot_subcall_worked: (
0 if call_return == Op.REVERT or call_return == Om.OOG else 1
),
}
)
}
tx = Transaction(
sender=pre.fund_eoa(7_000_000_000_000_000_000),
to=address_to,
gas_price=10,
data=Hash(do_reenter),
gas_limit=5000000,
value=0,
)
state_test(env=Environment(), pre=pre, post=post, tx=tx)
|