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Detect if function has at least one memory arg

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pull/1022/head
Tadashi 3 years ago
parent e07cd66024
commit 8eede9d95f
3 changed files with 24 additions and 124 deletions
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  1. 24
      slither/detectors/functions/external_function.py
  2. 62
      tests/detectors/external-function/0.4.25/external_function.sol.0.4.25.ExternalFunction.json
  3. 62
      tests/detectors/external-function/0.5.16/external_function.sol.0.5.16.ExternalFunction.json

24
slither/detectors/functions/external_function.py
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@ -1,3 +1,7 @@
from array import ArrayType
from slither.core.declarations.structure import Structure
from slither.core.solidity_types.mapping_type import MappingType
from slither.core.solidity_types.user_defined_type import UserDefinedType
from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
from slither.slithir.operations import SolidityCall
from slither.slithir.operations import InternalCall, InternalDynamicCall
@ -105,6 +109,18 @@ class ExternalFunction(AbstractDetector):
def function_parameters_written(function):
return any(p in function.variables_written for p in function.parameters)
@staticmethod
def is_reference_type(parameter):
if isinstance(parameter.type, ArrayType):
return True
if isinstance(parameter.type, MappingType):
return True
if isinstance(parameter.type, UserDefinedType) and isinstance(parameter.type.type, Structure):
return True
if str(parameter.type) in ["bytes", "string"]:
return True
return False
def _detect(self): # pylint: disable=too-many-locals,too-many-branches
results = []
@ -135,6 +151,14 @@ class ExternalFunction(AbstractDetector):
# Next we'll want to loop through all functions defined directly in this contract.
for function in contract.functions_declared:
# If all of the function arguments are non-reference type or calldata, we skip it.
reference_args = []
for arg in function.parameters:
if self.is_reference_type(arg) and arg.location == 'memory':
reference_args.append(arg)
if len(reference_args) == 0 and len(function.parameters) > 0:
continue
# If the function is a constructor, or is public, we skip it.
if function.is_constructor or function.visibility != "public":
continue

62
tests/detectors/external-function/0.4.25/external_function.sol.0.4.25.ExternalFunction.json
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@ -210,68 +210,6 @@
"impact": "Optimization",
"confidence": "High"
},
{
"elements": [
{
"type": "function",
"name": "parameter_read_ok_for_external",
"source_mapping": {
"start": 1420,
"length": 81,
"filename_used": "/GENERIC_PATH",
"filename_relative": "tests/detectors/external-function/0.4.25/external_function.sol",
"filename_absolute": "/GENERIC_PATH",
"filename_short": "tests/detectors/external-function/0.4.25/external_function.sol",
"is_dependency": false,
"lines": [
74,
75,
76
],
"starting_column": 3,
"ending_column": 4
},
"type_specific_fields": {
"parent": {
"type": "contract",
"name": "FunctionParameterWrite",
"source_mapping": {
"start": 1381,
"length": 234,
"filename_used": "/GENERIC_PATH",
"filename_relative": "tests/detectors/external-function/0.4.25/external_function.sol",
"filename_absolute": "/GENERIC_PATH",
"filename_short": "tests/detectors/external-function/0.4.25/external_function.sol",
"is_dependency": false,
"lines": [
72,
73,
74,
75,
76,
77,
78,
79,
80,
81,
82
],
"starting_column": 1,
"ending_column": 2
}
},
"signature": "parameter_read_ok_for_external(uint256)"
}
}
],
"description": "parameter_read_ok_for_external(uint256) should be declared external:\n\t- FunctionParameterWrite.parameter_read_ok_for_external(uint256) (tests/detectors/external-function/0.4.25/external_function.sol#74-76)\n",
"markdown": "parameter_read_ok_for_external(uint256) should be declared external:\n\t- [FunctionParameterWrite.parameter_read_ok_for_external(uint256)](tests/detectors/external-function/0.4.25/external_function.sol#L74-L76)\n",
"first_markdown_element": "tests/detectors/external-function/0.4.25/external_function.sol#L74-L76",
"id": "3a0a42d128eff9fb04d8f7605bf2d6f7574c2cbbdffa2dcabbae66d7568ecc59",
"check": "external-function",
"impact": "Optimization",
"confidence": "High"
},
{
"elements": [
{

62
tests/detectors/external-function/0.5.16/external_function.sol.0.5.16.ExternalFunction.json
Unescape View File

@ -210,68 +210,6 @@
"impact": "Optimization",
"confidence": "High"
},
{
"elements": [
{
"type": "function",
"name": "parameter_read_ok_for_external",
"source_mapping": {
"start": 1420,
"length": 81,
"filename_used": "/GENERIC_PATH",
"filename_relative": "tests/detectors/external-function/0.5.16/external_function.sol",
"filename_absolute": "/GENERIC_PATH",
"filename_short": "tests/detectors/external-function/0.5.16/external_function.sol",
"is_dependency": false,
"lines": [
74,
75,
76
],
"starting_column": 3,
"ending_column": 4
},
"type_specific_fields": {
"parent": {
"type": "contract",
"name": "FunctionParameterWrite",
"source_mapping": {
"start": 1381,
"length": 234,
"filename_used": "/GENERIC_PATH",
"filename_relative": "tests/detectors/external-function/0.5.16/external_function.sol",
"filename_absolute": "/GENERIC_PATH",
"filename_short": "tests/detectors/external-function/0.5.16/external_function.sol",
"is_dependency": false,
"lines": [
72,
73,
74,
75,
76,
77,
78,
79,
80,
81,
82
],
"starting_column": 1,
"ending_column": 2
}
},
"signature": "parameter_read_ok_for_external(uint256)"
}
}
],
"description": "parameter_read_ok_for_external(uint256) should be declared external:\n\t- FunctionParameterWrite.parameter_read_ok_for_external(uint256) (tests/detectors/external-function/0.5.16/external_function.sol#74-76)\n",
"markdown": "parameter_read_ok_for_external(uint256) should be declared external:\n\t- [FunctionParameterWrite.parameter_read_ok_for_external(uint256)](tests/detectors/external-function/0.5.16/external_function.sol#L74-L76)\n",
"first_markdown_element": "tests/detectors/external-function/0.5.16/external_function.sol#L74-L76",
"id": "3a0a42d128eff9fb04d8f7605bf2d6f7574c2cbbdffa2dcabbae66d7568ecc59",
"check": "external-function",
"impact": "Optimization",
"confidence": "High"
},
{
"elements": [
{

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