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b46801a774
* Read section info from PE header * Remove the need for textraw and textvirt members * typo
485 lines
16 KiB
Python
Executable file
485 lines
16 KiB
Python
Executable file
#!/usr/bin/env python3
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import argparse
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import base64
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import difflib
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import json
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import logging
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import os
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import re
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from isledecomp import (
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Bin,
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DecompParser,
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get_file_in_script_dir,
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OffsetPlaceholderGenerator,
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print_diff,
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SymInfo,
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walk_source_dir,
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WinePathConverter,
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)
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from capstone import Cs, CS_ARCH_X86, CS_MODE_32
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import colorama
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from pystache import Renderer
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REGISTER_LIST = set(
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[
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"ax",
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"bp",
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"bx",
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"cx",
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"di",
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"dx",
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"eax",
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"ebp",
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"ebx",
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"ecx",
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"edi",
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"edx",
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"esi",
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"esp",
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"si",
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"sp",
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]
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)
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WORDS = re.compile(r"\w+")
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def sanitize(file, placeholder_generator, mnemonic, op_str):
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op_str_is_number = False
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try:
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int(op_str, 16)
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op_str_is_number = True
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except ValueError:
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pass
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if (mnemonic in ["call", "jmp"]) and op_str_is_number:
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# Filter out "calls" because the offsets we're not currently trying to
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# match offsets. As long as there's a call in the right place, it's
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# probably accurate.
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op_str = placeholder_generator.get(int(op_str, 16))
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else:
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def filter_out_ptr(ptype, op_str):
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try:
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ptrstr = ptype + " ptr ["
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start = op_str.index(ptrstr) + len(ptrstr)
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end = op_str.index("]", start)
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# This will throw ValueError if not hex
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inttest = int(op_str[start:end], 16)
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return (
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op_str[0:start] + placeholder_generator.get(inttest) + op_str[end:]
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)
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except ValueError:
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return op_str
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# Filter out dword ptrs where the pointer is to an offset
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op_str = filter_out_ptr("dword", op_str)
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op_str = filter_out_ptr("word", op_str)
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op_str = filter_out_ptr("byte", op_str)
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# Use heuristics to filter out any args that look like offsets
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words = op_str.split(" ")
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for i, word in enumerate(words):
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try:
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inttest = int(word, 16)
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if inttest >= file.get_section_offset_by_index(1):
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words[i] = placeholder_generator.get(inttest)
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except ValueError:
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pass
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op_str = " ".join(words)
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return mnemonic, op_str
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def parse_asm(disassembler, file, asm_addr, size):
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asm = []
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data = file.read(asm_addr, size)
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placeholder_generator = OffsetPlaceholderGenerator()
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for i in disassembler.disasm(data, 0):
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# Use heuristics to disregard some differences that aren't representative
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# of the accuracy of a function (e.g. global offsets)
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mnemonic, op_str = sanitize(file, placeholder_generator, i.mnemonic, i.op_str)
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if op_str is None:
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asm.append(mnemonic)
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else:
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asm.append(f"{mnemonic} {op_str}")
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return asm
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def get_registers(line: str):
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to_replace = []
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# use words regex to find all matching positions:
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for match in WORDS.finditer(line):
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reg = match.group(0)
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if reg in REGISTER_LIST:
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to_replace.append((reg, match.start()))
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return to_replace
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def replace_register(
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lines: list[str], start_line: int, reg: str, replacement: str
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) -> list[str]:
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return [
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line.replace(reg, replacement) if i >= start_line else line
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for i, line in enumerate(lines)
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]
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# Is it possible to make new_asm the same as original_asm by swapping registers?
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def can_resolve_register_differences(original_asm, new_asm):
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# Split the ASM on spaces to get more granularity, and so
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# that we don't modify the original arrays passed in.
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original_asm = [part for line in original_asm for part in line.split()]
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new_asm = [part for line in new_asm for part in line.split()]
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# Swapping ain't gonna help if the lengths are different
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if len(original_asm) != len(new_asm):
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return False
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# Look for the mismatching lines
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for i, original_line in enumerate(original_asm):
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new_line = new_asm[i]
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if new_line != original_line:
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# Find all the registers to replace
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to_replace = get_registers(original_line)
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for replace in to_replace:
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(reg, reg_index) = replace
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replacing_reg = new_line[reg_index : reg_index + len(reg)]
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if replacing_reg in REGISTER_LIST:
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if replacing_reg != reg:
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# Do a three-way swap replacing in all the subsequent lines
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temp_reg = "&" * len(reg)
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new_asm = replace_register(new_asm, i, replacing_reg, temp_reg)
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new_asm = replace_register(new_asm, i, reg, replacing_reg)
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new_asm = replace_register(new_asm, i, temp_reg, reg)
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else:
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# No replacement to do, different code, bail out
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return False
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# Check if the lines are now the same
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for i, original_line in enumerate(original_asm):
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if new_asm[i] != original_line:
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return False
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return True
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def gen_html(html_file, data):
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output_data = Renderer().render_path(
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get_file_in_script_dir("template.html"), {"data": data}
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)
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with open(html_file, "w", encoding="utf-8") as htmlfile:
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htmlfile.write(output_data)
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def gen_svg(svg_file, name_svg, icon, svg_implemented_funcs, total_funcs, raw_accuracy):
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icon_data = None
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if icon:
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with open(icon, "rb") as iconfile:
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icon_data = base64.b64encode(iconfile.read()).decode("utf-8")
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total_statistic = raw_accuracy / total_funcs
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full_percentbar_width = 127.18422
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output_data = Renderer().render_path(
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get_file_in_script_dir("template.svg"),
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{
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"name": name_svg,
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"icon": icon_data,
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"implemented": f"{(svg_implemented_funcs / total_funcs * 100):.2f}% ({svg_implemented_funcs}/{total_funcs})",
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"accuracy": f"{(raw_accuracy / svg_implemented_funcs * 100):.2f}%",
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"progbar": total_statistic * full_percentbar_width,
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"percent": f"{(total_statistic * 100):.2f}%",
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},
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)
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with open(svg_file, "w", encoding="utf-8") as svgfile:
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svgfile.write(output_data)
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# Do the actual work
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(
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allow_abbrev=False,
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description="Recompilation Compare: compare an original EXE with a recompiled EXE + PDB.",
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)
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parser.add_argument(
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"original", metavar="original-binary", help="The original binary"
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)
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parser.add_argument(
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"recompiled", metavar="recompiled-binary", help="The recompiled binary"
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)
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parser.add_argument(
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"pdb", metavar="recompiled-pdb", help="The PDB of the recompiled binary"
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)
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parser.add_argument(
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"decomp_dir", metavar="decomp-dir", help="The decompiled source tree"
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)
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parser.add_argument(
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"--total",
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"-T",
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metavar="<count>",
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help="Total number of expected functions (improves total accuracy statistic)",
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)
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parser.add_argument(
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"--verbose",
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"-v",
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metavar="<offset>",
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help="Print assembly diff for specific function (original file's offset)",
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)
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parser.add_argument(
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"--html",
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"-H",
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metavar="<file>",
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help="Generate searchable HTML summary of status and diffs",
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)
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parser.add_argument(
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"--no-color", "-n", action="store_true", help="Do not color the output"
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)
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parser.add_argument(
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"--svg", "-S", metavar="<file>", help="Generate SVG graphic of progress"
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)
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parser.add_argument("--svg-icon", metavar="icon", help="Icon to use in SVG (PNG)")
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parser.add_argument(
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"--print-rec-addr",
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action="store_true",
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help="Print addresses of recompiled functions too",
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)
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parser.set_defaults(loglevel=logging.INFO)
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parser.add_argument(
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"--debug",
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action="store_const",
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const=logging.DEBUG,
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dest="loglevel",
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help="Print script debug information",
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)
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args = parser.parse_args()
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logging.basicConfig(level=args.loglevel, format="[%(levelname)s] %(message)s")
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logger = logging.getLogger(__name__)
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colorama.init()
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verbose = None
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found_verbose_target = False
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if args.verbose:
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try:
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verbose = int(args.verbose, 16)
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except ValueError:
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parser.error("invalid verbose argument")
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html_path = args.html
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plain = args.no_color
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original = args.original
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if not os.path.isfile(original):
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parser.error(f"Original binary {original} does not exist")
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recomp = args.recompiled
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if not os.path.isfile(recomp):
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parser.error(f"Recompiled binary {recomp} does not exist")
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syms = args.pdb
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if not os.path.isfile(syms):
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parser.error(f"Symbols PDB {syms} does not exist")
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source = args.decomp_dir
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if not os.path.isdir(source):
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parser.error(f"Source directory {source} does not exist")
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svg = args.svg
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wine_path_converter = None
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if os.name != "nt":
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wine_path_converter = WinePathConverter(source)
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with Bin(original, logger) as origfile, Bin(recomp, logger) as recompfile:
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syminfo = SymInfo(
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syms, recompfile, logger, sym_wine_path_converter=wine_path_converter
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)
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print()
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capstone_disassembler = Cs(CS_ARCH_X86, CS_MODE_32)
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function_count = 0
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total_accuracy = 0
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total_effective_accuracy = 0
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htmlinsert = []
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# Generate basename of original file, used in locating OFFSET lines
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basename = os.path.basename(os.path.splitext(original)[0])
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parser = DecompParser()
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for srcfilename in walk_source_dir(source):
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parser.reset()
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with open(srcfilename, "r", encoding="utf-8") as srcfile:
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parser.read_lines(srcfile)
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for fun in parser.functions:
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if fun.is_stub:
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continue
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if fun.module != basename:
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continue
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addr = fun.offset
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# Verbose flag handling
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if verbose:
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if addr == verbose:
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found_verbose_target = True
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else:
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continue
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if fun.lookup_by_name:
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recinfo = syminfo.get_recompiled_address_from_name(fun.name)
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if not recinfo:
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continue
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else:
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recinfo = syminfo.get_recompiled_address(
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srcfilename, fun.line_number
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)
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if not recinfo:
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continue
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# The effective_ratio is the ratio when ignoring differing register
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# allocation vs the ratio is the true ratio.
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ratio = 0.0
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effective_ratio = 0.0
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if recinfo.size:
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origasm = parse_asm(
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capstone_disassembler,
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origfile,
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addr + recinfo.start,
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recinfo.size,
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)
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recompasm = parse_asm(
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capstone_disassembler,
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recompfile,
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recinfo.addr + recinfo.start,
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recinfo.size,
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)
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diff = difflib.SequenceMatcher(None, origasm, recompasm)
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ratio = diff.ratio()
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effective_ratio = ratio
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if ratio != 1.0:
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# Check whether we can resolve register swaps which are actually
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# perfect matches modulo compiler entropy.
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if can_resolve_register_differences(origasm, recompasm):
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effective_ratio = 1.0
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else:
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ratio = 0
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percenttext = f"{(effective_ratio * 100):.2f}%"
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if not plain:
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if effective_ratio == 1.0:
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percenttext = (
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colorama.Fore.GREEN + percenttext + colorama.Style.RESET_ALL
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)
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elif effective_ratio > 0.8:
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percenttext = (
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colorama.Fore.YELLOW
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+ percenttext
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+ colorama.Style.RESET_ALL
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)
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else:
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percenttext = (
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colorama.Fore.RED + percenttext + colorama.Style.RESET_ALL
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)
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if effective_ratio == 1.0 and ratio != 1.0:
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if plain:
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percenttext += "*"
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else:
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percenttext += (
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colorama.Fore.RED + "*" + colorama.Style.RESET_ALL
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)
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if args.print_rec_addr:
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addrs = f"0x{addr:x} / 0x{recinfo.addr:x}"
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else:
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addrs = hex(addr)
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if not verbose:
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print(
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f" {recinfo.name} ({addrs}) is {percenttext} similar to the original"
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)
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function_count += 1
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total_accuracy += ratio
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total_effective_accuracy += effective_ratio
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if recinfo.size:
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udiff = difflib.unified_diff(origasm, recompasm, n=10)
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# If verbose, print the diff for that function to the output
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if verbose:
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if effective_ratio == 1.0:
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ok_text = (
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"OK!"
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if plain
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else (
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colorama.Fore.GREEN
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+ "✨ OK! ✨"
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+ colorama.Style.RESET_ALL
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)
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)
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if ratio == 1.0:
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print(
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f"{addrs}: {recinfo.name} 100% match.\n\n{ok_text}\n\n"
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)
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else:
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print(
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f"{addrs}: {recinfo.name} Effective 100%% match. (Differs in register allocation only)\n\n{ok_text} (still differs in register allocation)\n\n"
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)
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else:
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print_diff(udiff, plain)
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print(
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f"\n{recinfo.name} is only {percenttext} similar to the original, diff above"
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)
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# If html, record the diffs to an HTML file
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if html_path:
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htmlinsert.append(
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{
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"address": f"0x{addr:x}",
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"name": recinfo.name,
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"matching": effective_ratio,
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"diff": "\n".join(udiff),
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}
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)
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if html_path:
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gen_html(html_path, json.dumps(htmlinsert))
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if verbose:
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if not found_verbose_target:
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print(f"Failed to find the function with address 0x{verbose:x}")
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else:
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implemented_funcs = function_count
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if args.total:
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function_count = int(args.total)
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if function_count > 0:
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effective_accuracy = total_effective_accuracy / function_count * 100
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actual_accuracy = total_accuracy / function_count * 100
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print(
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f"\nTotal effective accuracy {effective_accuracy:.2f}% across {function_count} functions ({actual_accuracy:.2f}% actual accuracy)"
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)
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if svg:
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gen_svg(
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svg,
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os.path.basename(original),
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args.svg_icon,
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implemented_funcs,
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function_count,
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total_effective_accuracy,
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)
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