diff --git a/find_data_ptr_guard_dispatch_icall.py b/find_data_ptr_guard_dispatch_icall.py new file mode 100644 index 0000000..f8c7795 --- /dev/null +++ b/find_data_ptr_guard_dispatch_icall.py @@ -0,0 +1,72 @@ +import idautils +import idc +import idaapi + +# Get the start and end addresses of .data segment +data_seg = idaapi.get_segm_by_name('.data') +if data_seg: + data_start, data_end = data_seg.start_ea, data_seg.end_ea +else: + print("Error: .data segment not found.") + exit() + +global_vars = {} + +# Traverse all functions in the IDB +for function_ea in idautils.Functions(): + # Traverse all instruction addresses in the current function + for instruction_ea in idautils.FuncItems(function_ea): + # Check if the instruction operates on a memory location + if idc.is_loaded(idc.get_operand_value(instruction_ea, 1)): + # Get the segment address of the memory location + seg_ea = idaapi.getseg(idc.get_operand_value(instruction_ea, 1)).start_ea + + # Check if the segment is the .data segment + if seg_ea == data_start: + # Get the name of the global variable being accessed + global_var_name = idc.get_name(idc.get_operand_value(instruction_ea, 1)) + + # If the global variable is not already in the dictionary, add it + if global_var_name not in global_vars: + global_vars[global_var_name] = {'refs': [], 'calls': []} + + # Add the current instruction address to the list of references for the current global variable + global_vars[global_var_name]['refs'].append(instruction_ea) + + # Traverse the next 10 instructions or until a call to '_guard_dispatch_icall' is found + next_ea = instruction_ea; + for _ in range(10): + # Get the address of the next instruction after the current one + call_instr_ea = next_ea + idaapi.get_item_size(next_ea) + call_ea = idc.get_operand_value(call_instr_ea, 0) + # Check if the next instruction is a call instruction and the called function is '_guard_dispatch_icall' + called_func_name = idaapi.get_func_name(call_ea) + if idaapi.is_call_insn(call_instr_ea) and called_func_name == '_guard_dispatch_icall': + # Add the current instruction address to the list of calls for the current global variable + func = idaapi.get_func(call_ea) + if func: + global_vars[global_var_name]['calls'].append((call_ea, call_instr_ea)) + break + + # Update the value of next_ea with the address of the next instruction + next_ea = call_instr_ea + +# Output the results to the console +for global_var_name, info_dict in global_vars.items(): + # Check if the global variable has any calls to the function '_guard_dispatch_icall' and is not '__security_cookie' + should_print = info_dict['calls'] and global_var_name != '__security_cookie' + + if should_print: + # Print the name of the global variable + print(".data ptr with _guard_dispatch_icall: %s" % global_var_name) + + # Traverse the list of call locations for this global variable + for call_ea, call_instr_ea in info_dict['calls']: + # Get the function containing the call instruction + func = idaapi.get_func(call_instr_ea) + func_ea = func.start_ea + func_name = idaapi.get_func_name(func_ea) + + # Print the name of the function and the address where it was called + print(" Function %s (called at: 0x%x)" % (func_name, call_instr_ea)) +