897 lines
34 KiB
Python
Executable File
897 lines
34 KiB
Python
Executable File
#!/usr/bin/python
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# me_cleaner - Tool for partial deblobbing of Intel ME/TXE firmware images
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# Copyright (C) 2016-2018 Nicola Corna <nicola@corna.info>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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from __future__ import division, print_function
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import argparse
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import binascii
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import hashlib
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import itertools
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import shutil
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import sys
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from struct import pack, unpack
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min_ftpr_offset = 0x400
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spared_blocks = 4
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unremovable_modules = ("ROMP", "BUP")
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unremovable_modules_me11 = ("rbe", "kernel", "syslib", "bup")
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unremovable_partitions = ("FTPR",)
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pubkeys_md5 = {
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"763e59ebe235e45a197a5b1a378dfa04": ("ME", ("6.x.x.x",)),
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"3a98c847d609c253e145bd36512629cb": ("ME", ("6.0.50.x",)),
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"0903fc25b0f6bed8c4ed724aca02124c": ("ME", ("7.x.x.x", "8.x.x.x")),
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"2011ae6df87c40fba09e3f20459b1ce0": ("ME", ("9.0.x.x", "9.1.x.x")),
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"e8427c5691cf8b56bc5cdd82746957ed": ("ME", ("9.5.x.x", "10.x.x.x")),
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"986a78e481f185f7d54e4af06eb413f6": ("ME", ("11.x.x.x",)),
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"bda0b6bb8ca0bf0cac55ac4c4d55e0f2": ("TXE", ("1.x.x.x",)),
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"b726a2ab9cd59d4e62fe2bead7cf6997": ("TXE", ("1.x.x.x",)),
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"0633d7f951a3e7968ae7460861be9cfb": ("TXE", ("2.x.x.x",)),
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"1d0a36e9f5881540d8e4b382c6612ed8": ("TXE", ("3.x.x.x",)),
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"be900fef868f770d266b1fc67e887e69": ("SPS", ("2.x.x.x",)),
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"4622e3f2cb212a89c90a4de3336d88d2": ("SPS", ("3.x.x.x",)),
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"31ef3d950eac99d18e187375c0764ca4": ("SPS", ("4.x.x.x",))
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}
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class OutOfRegionException(Exception):
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pass
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class RegionFile:
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def __init__(self, f, region_start, region_end):
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self.f = f
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self.region_start = region_start
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self.region_end = region_end
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def read(self, n):
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if f.tell() + n <= self.region_end:
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return self.f.read(n)
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else:
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raise OutOfRegionException()
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def readinto(self, b):
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if f.tell() + len(b) <= self.region_end:
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return self.f.readinto(b)
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else:
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raise OutOfRegionException()
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def seek(self, offset):
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if self.region_start + offset <= self.region_end:
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return self.f.seek(self.region_start + offset)
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else:
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raise OutOfRegionException()
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def write_to(self, offset, data):
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if self.region_start + offset + len(data) <= self.region_end:
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self.f.seek(self.region_start + offset)
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return self.f.write(data)
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else:
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raise OutOfRegionException()
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def fill_range(self, start, end, fill):
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if self.region_start + end <= self.region_end:
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if start < end:
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block = fill * 4096
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self.f.seek(self.region_start + start)
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self.f.writelines(itertools.repeat(block,
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(end - start) // 4096))
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self.f.write(block[:(end - start) % 4096])
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else:
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raise OutOfRegionException()
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def fill_all(self, fill):
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self.fill_range(0, self.region_end - self.region_start, fill)
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def move_range(self, offset_from, size, offset_to, fill):
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if self.region_start + offset_from + size <= self.region_end and \
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self.region_start + offset_to + size <= self.region_end:
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for i in range(0, size, 4096):
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self.f.seek(self.region_start + offset_from + i, 0)
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block = self.f.read(min(size - i, 4096))
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self.f.seek(self.region_start + offset_from + i, 0)
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self.f.write(fill * len(block))
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self.f.seek(self.region_start + offset_to + i, 0)
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self.f.write(block)
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else:
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raise OutOfRegionException()
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def save(self, filename, size):
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if self.region_start + size <= self.region_end:
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self.f.seek(self.region_start)
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copyf = open(filename, "w+b")
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for i in range(0, size, 4096):
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copyf.write(self.f.read(min(size - i, 4096)))
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return copyf
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else:
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raise OutOfRegionException()
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def get_chunks_offsets(llut):
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chunk_count = unpack("<I", llut[0x04:0x08])[0]
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huffman_stream_end = sum(unpack("<II", llut[0x10:0x18]))
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nonzero_offsets = [huffman_stream_end]
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offsets = []
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for i in range(0, chunk_count):
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chunk = llut[0x40 + i * 4:0x44 + i * 4]
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offset = 0
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if chunk[3] != 0x80:
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offset = unpack("<I", chunk[0:3] + b"\x00")[0]
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offsets.append([offset, 0])
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if offset != 0:
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nonzero_offsets.append(offset)
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nonzero_offsets.sort()
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for i in offsets:
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if i[0] != 0:
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i[1] = nonzero_offsets[nonzero_offsets.index(i[0]) + 1]
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return offsets
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def remove_modules(f, mod_headers, ftpr_offset, me_end):
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comp_str = ("uncomp.", "Huffman", "LZMA")
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unremovable_huff_chunks = []
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chunks_offsets = []
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base = 0
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chunk_size = 0
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end_addr = 0
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for mod_header in mod_headers:
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name = mod_header[0x04:0x14].rstrip(b"\x00").decode("ascii")
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offset = unpack("<I", mod_header[0x38:0x3C])[0] + ftpr_offset
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size = unpack("<I", mod_header[0x40:0x44])[0]
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flags = unpack("<I", mod_header[0x50:0x54])[0]
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comp_type = (flags >> 4) & 7
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print(" {:<16} ({:<7}, ".format(name, comp_str[comp_type]), end="")
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if comp_type == 0x00 or comp_type == 0x02:
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print("0x{:06x} - 0x{:06x} ): "
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.format(offset, offset + size), end="")
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if name in unremovable_modules:
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end_addr = max(end_addr, offset + size)
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print("NOT removed, essential")
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else:
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end = min(offset + size, me_end)
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f.fill_range(offset, end, b"\xff")
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print("removed")
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elif comp_type == 0x01:
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if not chunks_offsets:
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f.seek(offset)
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llut = f.read(4)
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if llut == b"LLUT":
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llut += f.read(0x3c)
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chunk_count = unpack("<I", llut[0x4:0x8])[0]
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base = unpack("<I", llut[0x8:0xc])[0] + 0x10000000
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chunk_size = unpack("<I", llut[0x30:0x34])[0]
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llut += f.read(chunk_count * 4)
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chunks_offsets = get_chunks_offsets(llut)
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else:
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sys.exit("Huffman modules found, but LLUT is not present")
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module_base = unpack("<I", mod_header[0x34:0x38])[0]
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module_size = unpack("<I", mod_header[0x3c:0x40])[0]
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first_chunk_num = (module_base - base) // chunk_size
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last_chunk_num = first_chunk_num + module_size // chunk_size
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huff_size = 0
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for chunk in chunks_offsets[first_chunk_num:last_chunk_num + 1]:
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huff_size += chunk[1] - chunk[0]
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print("fragmented data, {:<9}): "
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.format("~" + str(int(round(huff_size / 1024))) + " KiB"),
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end="")
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if name in unremovable_modules:
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print("NOT removed, essential")
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unremovable_huff_chunks += \
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[x for x in chunks_offsets[first_chunk_num:
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last_chunk_num + 1] if x[0] != 0]
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else:
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print("removed")
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else:
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print("0x{:06x} - 0x{:06x}): unknown compression, skipping"
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.format(offset, offset + size), end="")
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if chunks_offsets:
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removable_huff_chunks = []
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for chunk in chunks_offsets:
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if all(not(unremovable_chk[0] <= chunk[0] < unremovable_chk[1] or
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unremovable_chk[0] < chunk[1] <= unremovable_chk[1])
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for unremovable_chk in unremovable_huff_chunks):
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removable_huff_chunks.append(chunk)
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for removable_chunk in removable_huff_chunks:
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if removable_chunk[1] > removable_chunk[0]:
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end = min(removable_chunk[1], me_end)
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f.fill_range(removable_chunk[0], end, b"\xff")
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end_addr = max(end_addr,
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max(unremovable_huff_chunks, key=lambda x: x[1])[1])
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return end_addr
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def check_partition_signature(f, offset):
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f.seek(offset)
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header = f.read(0x80)
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modulus = int(binascii.hexlify(f.read(0x100)[::-1]), 16)
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public_exponent = unpack("<I", f.read(4))[0]
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signature = int(binascii.hexlify(f.read(0x100)[::-1]), 16)
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header_len = unpack("<I", header[0x4:0x8])[0] * 4
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manifest_len = unpack("<I", header[0x18:0x1c])[0] * 4
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f.seek(offset + header_len)
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sha256 = hashlib.sha256()
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sha256.update(header)
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sha256.update(f.read(manifest_len - header_len))
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decrypted_sig = pow(signature, public_exponent, modulus)
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return "{:#x}".format(decrypted_sig).endswith(sha256.hexdigest()) # FIXME
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def print_check_partition_signature(f, offset):
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if check_partition_signature(f, offset):
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print("VALID")
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else:
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print("INVALID!!")
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sys.exit("The FTPR partition signature is not valid. Is the input "
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"ME/TXE image valid?")
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def relocate_partition(f, me_end, partition_header_offset,
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new_offset, mod_headers):
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f.seek(partition_header_offset)
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name = f.read(4).rstrip(b"\x00").decode("ascii")
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f.seek(partition_header_offset + 0x8)
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old_offset, partition_size = unpack("<II", f.read(0x8))
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llut_start = 0
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for mod_header in mod_headers:
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if (unpack("<I", mod_header[0x50:0x54])[0] >> 4) & 7 == 0x01:
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llut_start = unpack("<I", mod_header[0x38:0x3C])[0] + old_offset
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break
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if mod_headers and llut_start != 0:
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# Bytes 0x9:0xb of the LLUT (bytes 0x1:0x3 of the AddrBase) are added
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# to the SpiBase (bytes 0xc:0x10 of the LLUT) to compute the final
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# start of the LLUT. Since AddrBase is not modifiable, we can act only
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# on SpiBase and here we compute the minimum allowed new_offset.
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f.seek(llut_start + 0x9)
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lut_start_corr = unpack("<H", f.read(2))[0]
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new_offset = max(new_offset,
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lut_start_corr - llut_start - 0x40 + old_offset)
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new_offset = ((new_offset + 0x1f) // 0x20) * 0x20
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offset_diff = new_offset - old_offset
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print("Relocating {} from {:#x} - {:#x} to {:#x} - {:#x}..."
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.format(name, old_offset, old_offset + partition_size,
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new_offset, new_offset + partition_size))
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print(" Adjusting FPT entry...")
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f.write_to(partition_header_offset + 0x8,
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pack("<I", new_offset))
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if mod_headers:
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if llut_start != 0:
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f.seek(llut_start)
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if f.read(4) == b"LLUT":
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print(" Adjusting LUT start offset...")
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lut_offset = llut_start + offset_diff + 0x40 - lut_start_corr
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f.write_to(llut_start + 0x0c, pack("<I", lut_offset))
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print(" Adjusting Huffman start offset...")
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f.seek(llut_start + 0x14)
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old_huff_offset = unpack("<I", f.read(4))[0]
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f.write_to(llut_start + 0x14,
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pack("<I", old_huff_offset + offset_diff))
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print(" Adjusting chunks offsets...")
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f.seek(llut_start + 0x4)
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chunk_count = unpack("<I", f.read(4))[0]
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f.seek(llut_start + 0x40)
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chunks = bytearray(chunk_count * 4)
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f.readinto(chunks)
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for i in range(0, chunk_count * 4, 4):
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if chunks[i + 3] != 0x80:
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chunks[i:i + 3] = \
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pack("<I", unpack("<I", chunks[i:i + 3] +
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b"\x00")[0] + offset_diff)[0:3]
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f.write_to(llut_start + 0x40, chunks)
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else:
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sys.exit("Huffman modules present but no LLUT found!")
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else:
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print(" No Huffman modules found")
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print(" Moving data...")
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partition_size = min(partition_size, me_end - old_offset)
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f.move_range(old_offset, partition_size, new_offset, b"\xff")
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return new_offset
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def check_and_remove_modules(f, me_end, offset, min_offset,
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relocate, keep_modules):
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f.seek(offset + 0x20)
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num_modules = unpack("<I", f.read(4))[0]
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f.seek(offset + 0x290)
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data = f.read(0x84)
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mod_header_size = 0
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if data[0x0:0x4] == b"$MME":
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if data[0x60:0x64] == b"$MME" or num_modules == 1:
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mod_header_size = 0x60
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elif data[0x80:0x84] == b"$MME":
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mod_header_size = 0x80
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if mod_header_size != 0:
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f.seek(offset + 0x290)
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data = f.read(mod_header_size * num_modules)
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mod_headers = [data[i * mod_header_size:(i + 1) * mod_header_size]
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for i in range(0, num_modules)]
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if all(hdr.startswith(b"$MME") for hdr in mod_headers):
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if args.keep_modules:
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end_addr = offset + ftpr_length
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else:
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end_addr = remove_modules(f, mod_headers, offset, me_end)
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if args.relocate:
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new_offset = relocate_partition(f, me_end, 0x30, min_offset,
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mod_headers)
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end_addr += new_offset - offset
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offset = new_offset
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return end_addr, offset
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else:
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print("Found less modules than expected in the FTPR "
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"partition; skipping modules removal")
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else:
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print("Can't find the module header size; skipping "
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"modules removal")
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return -1, offset
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def check_and_remove_modules_me11(f, me_end, partition_offset,
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partition_length, min_offset, relocate,
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keep_modules):
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comp_str = ("LZMA/uncomp.", "Huffman")
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if keep_modules:
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end_data = partition_offset + partition_length
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else:
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end_data = 0
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f.seek(partition_offset + 0x4)
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module_count = unpack("<I", f.read(4))[0]
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modules = []
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modules.append(("end", partition_length, 0))
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f.seek(partition_offset + 0x10)
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for i in range(0, module_count):
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data = f.read(0x18)
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name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
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offset_block = unpack("<I", data[0xc:0x10])[0]
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offset = offset_block & 0x01ffffff
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comp_type = (offset_block & 0x02000000) >> 25
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modules.append((name, offset, comp_type))
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modules.sort(key=lambda x: x[1])
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for i in range(0, module_count):
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name = modules[i][0]
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offset = partition_offset + modules[i][1]
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end = partition_offset + modules[i + 1][1]
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removed = False
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if name.endswith(".man") or name.endswith(".met"):
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compression = "uncompressed"
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else:
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compression = comp_str[modules[i][2]]
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print(" {:<12} ({:<12}, 0x{:06x} - 0x{:06x}): "
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.format(name, compression, offset, end), end="")
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if name.endswith(".man"):
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print("NOT removed, partition manif.")
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elif name.endswith(".met"):
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print("NOT removed, module metadata")
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elif any(name.startswith(m) for m in unremovable_modules_me11):
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print("NOT removed, essential")
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else:
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removed = True
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f.fill_range(offset, min(end, me_end), b"\xff")
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print("removed")
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if not removed:
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end_data = max(end_data, end)
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if relocate:
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new_offset = relocate_partition(f, me_end, 0x30, min_offset, [])
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end_data += new_offset - partition_offset
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partition_offset = new_offset
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return end_data, partition_offset
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def check_mn2_tag(f, offset):
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f.seek(offset + 0x1c)
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tag = f.read(4)
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if tag != b"$MN2":
|
|
sys.exit("Wrong FTPR manifest tag ({}), this image may be corrupted"
|
|
.format(tag))
|
|
|
|
|
|
def flreg_to_start_end(flreg):
|
|
return (flreg & 0x7fff) << 12, (flreg >> 4 & 0x7fff000 | 0xfff) + 1
|
|
|
|
|
|
def start_end_to_flreg(start, end):
|
|
return (start & 0x7fff000) >> 12 | ((end - 1) & 0x7fff000) << 4
|
|
|
|
|
|
if __name__ == "__main__":
|
|
parser = argparse.ArgumentParser(description="Tool to remove as much code "
|
|
"as possible from Intel ME/TXE firmware "
|
|
"images")
|
|
softdis = parser.add_mutually_exclusive_group()
|
|
bw_list = parser.add_mutually_exclusive_group()
|
|
|
|
parser.add_argument("-v", "--version", action="version",
|
|
version="%(prog)s 1.2")
|
|
|
|
parser.add_argument("file", help="ME/TXE image or full dump")
|
|
parser.add_argument("-O", "--output", metavar='output_file', help="save "
|
|
"the modified image in a separate file, instead of "
|
|
"modifying the original file")
|
|
softdis.add_argument("-S", "--soft-disable", help="in addition to the "
|
|
"usual operations on the ME/TXE firmware, set the "
|
|
"MeAltDisable bit or the HAP bit to ask Intel ME/TXE "
|
|
"to disable itself after the hardware initialization "
|
|
"(requires a full dump)", action="store_true")
|
|
softdis.add_argument("-s", "--soft-disable-only", help="instead of the "
|
|
"usual operations on the ME/TXE firmware, just set "
|
|
"the MeAltDisable bit or the HAP bit to ask Intel "
|
|
"ME/TXE to disable itself after the hardware "
|
|
"initialization (requires a full dump)",
|
|
action="store_true")
|
|
parser.add_argument("-r", "--relocate", help="relocate the FTPR partition "
|
|
"to the top of the ME region to save even more space",
|
|
action="store_true")
|
|
parser.add_argument("-t", "--truncate", help="truncate the empty part of "
|
|
"the firmware (requires a separated ME/TXE image or "
|
|
"--extract-me)", action="store_true")
|
|
parser.add_argument("-k", "--keep-modules", help="don't remove the FTPR "
|
|
"modules, even when possible", action="store_true")
|
|
bw_list.add_argument("-w", "--whitelist", metavar="whitelist",
|
|
help="Comma separated list of additional partitions "
|
|
"to keep in the final image. This can be used to "
|
|
"specify the MFS partition for example, which stores "
|
|
"PCIe and clock settings.")
|
|
bw_list.add_argument("-b", "--blacklist", metavar="blacklist",
|
|
help="Comma separated list of partitions to remove "
|
|
"from the image. This option overrides the default "
|
|
"removal list.")
|
|
parser.add_argument("-d", "--descriptor", help="remove the ME/TXE "
|
|
"Read/Write permissions to the other regions on the "
|
|
"flash from the Intel Flash Descriptor (requires a "
|
|
"full dump)", action="store_true")
|
|
parser.add_argument("-D", "--extract-descriptor",
|
|
metavar='output_descriptor', help="extract the flash "
|
|
"descriptor from a full dump; when used with "
|
|
"--truncate save a descriptor with adjusted regions "
|
|
"start and end")
|
|
parser.add_argument("-M", "--extract-me", metavar='output_me_image',
|
|
help="extract the ME firmware from a full dump; when "
|
|
"used with --truncate save a truncated ME/TXE image")
|
|
parser.add_argument("-c", "--check", help="verify the integrity of the "
|
|
"fundamental parts of the firmware and exit",
|
|
action="store_true")
|
|
|
|
args = parser.parse_args()
|
|
|
|
if args.check and (args.soft_disable_only or args.soft_disable or
|
|
args.relocate or args.descriptor or args.truncate or args.output):
|
|
sys.exit("-c can't be used with -S, -s, -r, -d, -t or -O")
|
|
|
|
if args.soft_disable_only and (args.relocate or args.truncate):
|
|
sys.exit("-s can't be used with -r or -t")
|
|
|
|
if (args.whitelist or args.blacklist) and args.relocate:
|
|
sys.exit("Relocation is not yet supported with custom whitelist or "
|
|
"blacklist")
|
|
|
|
f = open(args.file, "rb" if args.check or args.output else "r+b")
|
|
f.seek(0x10)
|
|
magic = f.read(4)
|
|
|
|
if magic == b"$FPT":
|
|
print("ME/TXE image detected")
|
|
|
|
if args.descriptor or args.extract_descriptor or args.extract_me or \
|
|
args.soft_disable or args.soft_disable_only:
|
|
sys.exit("-d, -D, -M, -S and -s require a full dump")
|
|
|
|
f.seek(0, 2)
|
|
me_start = 0
|
|
me_end = f.tell()
|
|
mef = RegionFile(f, me_start, me_end)
|
|
|
|
elif magic == b"\x5a\xa5\xf0\x0f":
|
|
print("Full image detected")
|
|
|
|
if args.truncate and not args.extract_me:
|
|
sys.exit("-t requires a separated ME/TXE image (or --extract-me)")
|
|
|
|
f.seek(0x14)
|
|
flmap0, flmap1 = unpack("<II", f.read(8))
|
|
frba = flmap0 >> 12 & 0xff0
|
|
fmba = (flmap1 & 0xff) << 4
|
|
fpsba = flmap1 >> 12 & 0xff0
|
|
|
|
f.seek(frba)
|
|
flreg = unpack("<III", f.read(12))
|
|
|
|
fd_start, fd_end = flreg_to_start_end(flreg[0])
|
|
bios_start, bios_end = flreg_to_start_end(flreg[1])
|
|
me_start, me_end = flreg_to_start_end(flreg[2])
|
|
|
|
if me_start >= me_end:
|
|
sys.exit("The ME/TXE region in this image has been disabled")
|
|
|
|
mef = RegionFile(f, me_start, me_end)
|
|
|
|
mef.seek(0x10)
|
|
if mef.read(4) != b"$FPT":
|
|
sys.exit("The ME/TXE region is corrupted or missing")
|
|
|
|
print("The ME/TXE region goes from {:#x} to {:#x}"
|
|
.format(me_start, me_end))
|
|
else:
|
|
sys.exit("Unknown image")
|
|
|
|
end_addr = me_end
|
|
|
|
print("Found FPT header at {:#x}".format(mef.region_start + 0x10))
|
|
|
|
mef.seek(0x14)
|
|
entries = unpack("<I", mef.read(4))[0]
|
|
print("Found {} partition(s)".format(entries))
|
|
|
|
mef.seek(0x30)
|
|
partitions = mef.read(entries * 0x20)
|
|
|
|
ftpr_header = b""
|
|
|
|
for i in range(entries):
|
|
if partitions[i * 0x20:(i * 0x20) + 4] == b"FTPR":
|
|
ftpr_header = partitions[i * 0x20:(i + 1) * 0x20]
|
|
break
|
|
|
|
if ftpr_header == b"":
|
|
sys.exit("FTPR header not found, this image doesn't seem to be valid")
|
|
|
|
ftpr_offset, ftpr_length = unpack("<II", ftpr_header[0x08:0x10])
|
|
print("Found FTPR header: FTPR partition spans from {:#x} to {:#x}"
|
|
.format(ftpr_offset, ftpr_offset + ftpr_length))
|
|
|
|
mef.seek(ftpr_offset)
|
|
if mef.read(4) == b"$CPD":
|
|
me11 = True
|
|
num_entries = unpack("<I", mef.read(4))[0]
|
|
|
|
mef.seek(ftpr_offset + 0x10)
|
|
ftpr_mn2_offset = -1
|
|
|
|
for i in range(0, num_entries):
|
|
data = mef.read(0x18)
|
|
name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
|
|
offset = unpack("<I", data[0xc:0xf] + b"\x00")[0]
|
|
|
|
if name == "FTPR.man":
|
|
ftpr_mn2_offset = offset
|
|
break
|
|
|
|
if ftpr_mn2_offset >= 0:
|
|
check_mn2_tag(mef, ftpr_offset + ftpr_mn2_offset)
|
|
print("Found FTPR manifest at {:#x}"
|
|
.format(ftpr_offset + ftpr_mn2_offset))
|
|
else:
|
|
sys.exit("Can't find the manifest of the FTPR partition")
|
|
|
|
else:
|
|
check_mn2_tag(mef, ftpr_offset)
|
|
me11 = False
|
|
ftpr_mn2_offset = 0
|
|
|
|
mef.seek(ftpr_offset + ftpr_mn2_offset + 0x24)
|
|
version = unpack("<HHHH", mef.read(0x08))
|
|
print("ME/TXE firmware version {}"
|
|
.format('.'.join(str(i) for i in version)))
|
|
|
|
mef.seek(ftpr_offset + ftpr_mn2_offset + 0x80)
|
|
pubkey_md5 = hashlib.md5(mef.read(0x104)).hexdigest()
|
|
|
|
if pubkey_md5 in pubkeys_md5:
|
|
variant, pubkey_versions = pubkeys_md5[pubkey_md5]
|
|
print("Public key match: Intel {}, firmware versions {}"
|
|
.format(variant, ", ".join(pubkey_versions)))
|
|
else:
|
|
if version[0] >= 6:
|
|
variant = "ME"
|
|
else:
|
|
variant = "TXE"
|
|
print("WARNING Unknown public key {}\n"
|
|
" Assuming Intel {}\n"
|
|
" Please report this warning to the project's maintainer!"
|
|
.format(pubkey_md5, variant))
|
|
|
|
if not args.check and args.output:
|
|
f.close()
|
|
shutil.copy(args.file, args.output)
|
|
f = open(args.output, "r+b")
|
|
|
|
mef = RegionFile(f, me_start, me_end)
|
|
|
|
if me_start > 0:
|
|
fdf = RegionFile(f, fd_start, fd_end)
|
|
|
|
if me11:
|
|
fdf.seek(fpsba)
|
|
pchstrp0 = unpack("<I", fdf.read(4))[0]
|
|
print("The HAP bit is " +
|
|
("SET" if pchstrp0 & 1 << 16 else "NOT SET"))
|
|
else:
|
|
fdf.seek(fpsba + 0x28)
|
|
pchstrp10 = unpack("<I", fdf.read(4))[0]
|
|
print("The AltMeDisable bit is " +
|
|
("SET" if pchstrp10 & 1 << 7 else "NOT SET"))
|
|
|
|
# ME 6 Ignition: wipe everything
|
|
me6_ignition = False
|
|
if not args.check and not args.soft_disable_only and \
|
|
variant == "ME" and version[0] == 6:
|
|
mef.seek(ftpr_offset + 0x20)
|
|
num_modules = unpack("<I", mef.read(4))[0]
|
|
mef.seek(ftpr_offset + 0x290 + (num_modules + 1) * 0x60)
|
|
data = mef.read(0xc)
|
|
|
|
if data[0x0:0x4] == b"$SKU" and data[0x8:0xc] == b"\x00\x00\x00\x00":
|
|
print("ME 6 Ignition firmware detected, removing everything...")
|
|
mef.fill_all(b"\xff")
|
|
me6_ignition = True
|
|
|
|
if not args.check:
|
|
if not args.soft_disable_only and not me6_ignition:
|
|
print("Reading partitions list...")
|
|
unremovable_part_fpt = b""
|
|
extra_part_end = 0
|
|
whitelist = []
|
|
blacklist = []
|
|
|
|
whitelist += unremovable_partitions
|
|
|
|
if args.blacklist:
|
|
blacklist = args.blacklist.split(",")
|
|
elif args.whitelist:
|
|
whitelist += args.whitelist.split(",")
|
|
|
|
for i in range(entries):
|
|
partition = partitions[i * 0x20:(i + 1) * 0x20]
|
|
flags = unpack("<I", partition[0x1c:0x20])[0]
|
|
|
|
try:
|
|
part_name = \
|
|
partition[0x0:0x4].rstrip(b"\x00").decode("ascii")
|
|
except UnicodeDecodeError:
|
|
part_name = "????"
|
|
|
|
part_start, part_length = unpack("<II", partition[0x08:0x10])
|
|
|
|
# ME 6: the last partition has 0xffffffff as size
|
|
if variant == "ME" and version[0] == 6 and \
|
|
i == entries - 1 and part_length == 0xffffffff:
|
|
part_length = me_end - me_start - part_start
|
|
|
|
part_end = part_start + part_length
|
|
|
|
if flags & 0x7f == 2:
|
|
print(" {:<4} ({:^24}, 0x{:08x} total bytes): nothing to "
|
|
"remove"
|
|
.format(part_name, "NVRAM partition, no data",
|
|
part_length))
|
|
elif part_start == 0 or part_length == 0 or part_end > me_end:
|
|
print(" {:<4} ({:^24}, 0x{:08x} total bytes): nothing to "
|
|
"remove"
|
|
.format(part_name, "no data here", part_length))
|
|
else:
|
|
print(" {:<4} (0x{:08x} - 0x{:09x}, 0x{:08x} total bytes): "
|
|
.format(part_name, part_start, part_end, part_length),
|
|
end="")
|
|
if part_name in whitelist or (blacklist and
|
|
part_name not in blacklist):
|
|
unremovable_part_fpt += partition
|
|
if part_name != "FTPR":
|
|
extra_part_end = max(extra_part_end, part_end)
|
|
print("NOT removed")
|
|
else:
|
|
mef.fill_range(part_start, part_end, b"\xff")
|
|
print("removed")
|
|
|
|
print("Removing partition entries in FPT...")
|
|
mef.write_to(0x30, unremovable_part_fpt)
|
|
mef.write_to(0x14,
|
|
pack("<I", len(unremovable_part_fpt) // 0x20))
|
|
|
|
mef.fill_range(0x30 + len(unremovable_part_fpt),
|
|
0x30 + len(partitions), b"\xff")
|
|
|
|
if (not blacklist and "EFFS" not in whitelist) or \
|
|
"EFFS" in blacklist:
|
|
print("Removing EFFS presence flag...")
|
|
mef.seek(0x24)
|
|
flags = unpack("<I", mef.read(4))[0]
|
|
flags &= ~(0x00000001)
|
|
mef.write_to(0x24, pack("<I", flags))
|
|
|
|
if me11:
|
|
mef.seek(0x10)
|
|
header = bytearray(mef.read(0x20))
|
|
header[0x0b] = 0x00
|
|
else:
|
|
mef.seek(0)
|
|
header = bytearray(mef.read(0x30))
|
|
header[0x1b] = 0x00
|
|
checksum = (0x100 - sum(header) & 0xff) & 0xff
|
|
|
|
print("Correcting checksum (0x{:02x})...".format(checksum))
|
|
# The checksum is just the two's complement of the sum of the first
|
|
# 0x30 bytes in ME < 11 or bytes 0x10:0x30 in ME >= 11 (except for
|
|
# 0x1b, the checksum itself). In other words, the sum of those
|
|
# bytes must be always 0x00.
|
|
mef.write_to(0x1b, pack("B", checksum))
|
|
|
|
print("Reading FTPR modules list...")
|
|
if me11:
|
|
end_addr, ftpr_offset = \
|
|
check_and_remove_modules_me11(mef, me_end,
|
|
ftpr_offset, ftpr_length,
|
|
min_ftpr_offset,
|
|
args.relocate,
|
|
args.keep_modules)
|
|
else:
|
|
end_addr, ftpr_offset = \
|
|
check_and_remove_modules(mef, me_end, ftpr_offset,
|
|
min_ftpr_offset, args.relocate,
|
|
args.keep_modules)
|
|
|
|
if end_addr > 0:
|
|
end_addr = max(end_addr, extra_part_end)
|
|
end_addr = (end_addr // 0x1000 + 1) * 0x1000
|
|
end_addr += spared_blocks * 0x1000
|
|
|
|
print("The ME minimum size should be {0} bytes "
|
|
"({0:#x} bytes)".format(end_addr))
|
|
|
|
if me_start > 0:
|
|
print("The ME region can be reduced up to:\n"
|
|
" {:08x}:{:08x} me"
|
|
.format(me_start, me_start + end_addr - 1))
|
|
elif args.truncate:
|
|
print("Truncating file at {:#x}...".format(end_addr))
|
|
f.truncate(end_addr)
|
|
|
|
if args.soft_disable or args.soft_disable_only:
|
|
if me11:
|
|
print("Setting the HAP bit in PCHSTRP0 to disable Intel ME...")
|
|
pchstrp0 |= (1 << 16)
|
|
fdf.write_to(fpsba, pack("<I", pchstrp0))
|
|
else:
|
|
print("Setting the AltMeDisable bit in PCHSTRP10 to disable "
|
|
"Intel ME...")
|
|
pchstrp10 |= (1 << 7)
|
|
fdf.write_to(fpsba + 0x28, pack("<I", pchstrp10))
|
|
|
|
if args.descriptor:
|
|
print("Removing ME/TXE R/W access to the other flash regions...")
|
|
if me11:
|
|
flmstr2 = 0x00400500
|
|
else:
|
|
fdf.seek(fmba + 0x4)
|
|
flmstr2 = (unpack("<I", fdf.read(4))[0] | 0x04040000) & 0x0404ffff
|
|
|
|
fdf.write_to(fmba + 0x4, pack("<I", flmstr2))
|
|
|
|
if args.extract_descriptor:
|
|
if args.truncate:
|
|
print("Extracting the descriptor to \"{}\"..."
|
|
.format(args.extract_descriptor))
|
|
fdf_copy = fdf.save(args.extract_descriptor, fd_end - fd_start)
|
|
|
|
if bios_start == me_end:
|
|
print("Modifying the regions of the extracted descriptor...")
|
|
print(" {:08x}:{:08x} me --> {:08x}:{:08x} me"
|
|
.format(me_start, me_end - 1,
|
|
me_start, me_start + end_addr - 1))
|
|
print(" {:08x}:{:08x} bios --> {:08x}:{:08x} bios"
|
|
.format(bios_start, bios_end - 1,
|
|
me_start + end_addr, bios_end - 1))
|
|
|
|
flreg1 = start_end_to_flreg(me_start + end_addr, bios_end)
|
|
flreg2 = start_end_to_flreg(me_start, me_start + end_addr)
|
|
|
|
fdf_copy.seek(frba + 0x4)
|
|
fdf_copy.write(pack("<II", flreg1, flreg2))
|
|
else:
|
|
print("\nWARNING:\n The start address of the BIOS region "
|
|
"isn't equal to the end address of the ME\n region: if "
|
|
"you want to recover the space from the ME region you "
|
|
"have to\n manually modify the descriptor.\n")
|
|
else:
|
|
print("Extracting the descriptor to \"{}\"..."
|
|
.format(args.extract_descriptor))
|
|
fdf_copy = fdf.save(args.extract_descriptor, fd_end - fd_start)
|
|
|
|
fdf_copy.close()
|
|
|
|
if args.extract_me:
|
|
if args.truncate:
|
|
print("Extracting and truncating the ME image to \"{}\"..."
|
|
.format(args.extract_me))
|
|
mef_copy = mef.save(args.extract_me, end_addr)
|
|
else:
|
|
print("Extracting the ME image to \"{}\"..."
|
|
.format(args.extract_me))
|
|
mef_copy = mef.save(args.extract_me, me_end - me_start)
|
|
|
|
if not me6_ignition:
|
|
print("Checking the FTPR RSA signature of the extracted ME "
|
|
"image... ", end="")
|
|
print_check_partition_signature(mef_copy,
|
|
ftpr_offset + ftpr_mn2_offset)
|
|
mef_copy.close()
|
|
|
|
if not me6_ignition:
|
|
print("Checking the FTPR RSA signature... ", end="")
|
|
print_check_partition_signature(mef, ftpr_offset + ftpr_mn2_offset)
|
|
|
|
f.close()
|
|
|
|
if not args.check:
|
|
print("Done! Good luck!")
|