Fixes issues with create with symbolic bytecode (#1578)

* Handle cases when create get's symbolic bytecodes

* Refactor

* fix typing

mythril/analysis/module/module_helpers.py

@@ -2,5 +2,12 @@
 
 
 def is_prehook() -> bool:
-    """Check if we are in prehook.  One of Bernhard's trademark hacks!"""
+    """Check if we are in prehook.  One of Bernhard's trademark hacks!
+    Let's leave it to this for now, unless we need to check prehook for
+    a lot more modules.
+    """
+
+    assert ("pre_hook" in traceback.format_stack()[-5]) or (
+        "post_hook" in traceback.format_stack()[-5]
+    )
     return "pre_hook" in traceback.format_stack()[-5]

mythril/laser/ethereum/call.py

@@ -179,6 +179,7 @@ def get_call_data(
             else memory_size
         ),
     )
+
     if memory_size.symbolic:
         memory_size = SYMBOLIC_CALLDATA_SIZE
     try:

mythril/laser/ethereum/instructions.py

@@ -3,7 +3,7 @@
 import logging
 
 from copy import copy, deepcopy
-from typing import cast, Callable, List, Union
+from typing import cast, Callable, List, Union, Tuple
 
 from mythril.laser.smt import (
     Extract,
@@ -306,6 +306,7 @@ def push_(self, global_state: GlobalState) -> List[GlobalState]:
                 new_value = Concat(
                     symbol_factory.BitVecVal(0, 256 - new_value.size()), new_value
                 )
+
             global_state.mstate.stack.append(new_value)
 
         else:
@@ -1076,7 +1077,6 @@ def codecopy_(self, global_state: GlobalState) -> List[GlobalState]:
         if code[0:2] == "0x":
             code = code[2:]
         code_size = len(code) // 2
-
         if isinstance(global_state.current_transaction, ContractCreationTransaction):
             # Treat creation code after the expected disassembly as calldata.
             # This is a slightly hacky way to ensure that symbolic constructor
@@ -1168,7 +1168,7 @@ def extcodesize_(self, global_state: GlobalState) -> List[GlobalState]:
 
     @staticmethod
     def _code_copy_helper(
-        code: str,
+        code: Union[str, Tuple],
         memory_offset: Union[int, BitVec],
         code_offset: Union[int, BitVec],
         size: Union[int, BitVec],
@@ -1218,14 +1218,25 @@ def _code_copy_helper(
             code = code[2:]
 
         for i in range(concrete_size):
-            if 2 * (concrete_code_offset + i + 1) > len(code):
-                break
-            global_state.mstate.memory[concrete_memory_offset + i] = int(
-                code[
-                    2 * (concrete_code_offset + i) : 2 * (concrete_code_offset + i + 1)
-                ],
-                16,
-            )
+            if isinstance(code, str):
+                if 2 * (concrete_code_offset + i + 1) > len(code):
+                    break
+
+                global_state.mstate.memory[concrete_memory_offset + i] = int(
+                    code[
+                        2
+                        * (concrete_code_offset + i) : 2
+                        * (concrete_code_offset + i + 1)
+                    ],
+                    16,
+                )
+            else:
+                if (concrete_code_offset + i + 1) > len(code):
+                    break
+
+                global_state.mstate.memory[concrete_memory_offset + i] = code[
+                    concrete_code_offset + i
+                ]
 
         return [global_state]
 
@@ -1717,12 +1728,11 @@ def _create_transaction_helper(
         world_state = global_state.world_state
 
         call_data = get_call_data(global_state, mem_offset, mem_offset + mem_size)
-
         code_raw = []
         code_end = call_data.size
         size = call_data.size
         if isinstance(size, BitVec):
-            # This should be fine because of the below check
+            # Other size restriction checks handle this
             if size.symbolic:
                 size = 10 ** 5
             else:

mythril/laser/plugin/plugins/coverage/coverage_plugin.py

@@ -53,10 +53,12 @@ def stop_sym_exec_hook():
                     cov_percentage = 0
                 else:
                     cov_percentage = sum(code_cov[1]) / float(code_cov[0]) * 100
-
+                string_code = code
+                if type(code) == tuple:
+                    string_code = bytearray(code).hex()
                 log.info(
                     "Achieved {:.2f}% coverage for code: {}".format(
-                        cov_percentage, code
+                        cov_percentage, string_code
                     )
                 )