Add support for generation 1
On generation 1 (ME version <= 5), Intel ME can be disabled completely by: * Wiping its firmware * Disabling the corresponding region * Setting the meDisable bits in ICHSTRP0 and MCHSTRP0 Optionally, with the usual -d flag, me_cleaner can remove the ME's RW permissions to the other regions (but it probably has no effect, Intel ME is disabled anyways). Based on ich9deblob from the libreboot project.
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2 changed files with 198 additions and 133 deletions
21
README.md
21
README.md
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@ -56,16 +56,19 @@ SPI programmer.
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## Results
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For pre-Skylake firmware (ME version < 11) this tool removes almost everything,
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leaving only the two fundamental modules needed for the correct boot, `ROMP` and
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`BUP`. The code size is reduced from 1.5 MB (non-AMT firmware) or 5 MB (AMT
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firmware) to ~90 kB of compressed code.
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For generation 1 (before Nehalem, ME version <= 5) this tool removes the whole
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ME firmware and disables it completely.
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Starting from Skylake (ME version >= 11) the ME subsystem and the firmware
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structure have changed, requiring substantial changes in _me\_cleaner_.
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The fundamental modules required for the correct boot are now four (`rbe`,
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`kernel`, `syslib` and `bup`) and the minimum code size is ~300 kB of compressed
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code (from the 2 MB of the non-AMT firmware and the 7 MB of the AMT one).
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For generation 2 (Nehalem-Broadwell, ME version between 6 and 10) this tool
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removes almost everything, leaving only the two fundamental modules needed for
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the correct boot, `ROMP` and `BUP`. The firmware size is reduced from 1.5 MB
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(non-AMT firmware) or 5 MB (AMT firmware) to ~90 kB.
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For generation 3 (from Skylake onwards, ME version >= 11) the ME subsystem and
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the firmware structure have changed, requiring substantial changes
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in _me\_cleaner_. The fundamental modules required for the correct boot are now
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four (`rbe`, `kernel`, `syslib` and `bup`) and the minimum firmware size is
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~300 kB (from the 2 MB of the non-AMT firmware and the 7 MB of the AMT one).
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On some boards the OEM firmware fails to boot without a valid Intel ME firmware;
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in the other cases the system should work with minor inconveniences (like longer
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310
me_cleaner.py
310
me_cleaner.py
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@ -28,10 +28,16 @@ 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_modules_gen3 = ("rbe", "kernel", "syslib", "bup")
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unremovable_partitions = ("FTPR",)
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pubkeys_md5 = {
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"8431285d43b0f2a2f520d7cab3d34178": ("ME", ("2.0.x.x", "2.1.x.x",
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"2.2.x.x")),
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"4c00dd06c28119b5c1e5bb8eb6f30596": ("ME", ("2.5.x.x", "2.6.x.x")),
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"9c24077a7f7490967855e9c4c16c6b9e": ("ME", ("3.x.x.x",)),
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"bf41464be736f5520d80c67f6789020e": ("ME", ("4.x.x.x",)),
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"5c7169b7e7065323fb7b3b5657b4d57a": ("ME", ("5.x.x.x",)),
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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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@ -384,7 +390,7 @@ def check_and_remove_modules(f, me_end, offset, min_offset,
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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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def check_and_remove_modules_gen3(f, me_end, partition_offset,
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partition_length, min_offset, relocate,
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keep_modules):
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@ -431,7 +437,7 @@ def check_and_remove_modules_me11(f, me_end, partition_offset,
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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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elif any(name.startswith(m) for m in unremovable_modules_gen3):
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print("NOT removed, essential")
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else:
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removed = True
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@ -449,10 +455,11 @@ def check_and_remove_modules_me11(f, me_end, partition_offset,
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return end_data, partition_offset
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def check_mn2_tag(f, offset):
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def check_mn2_tag(f, offset, gen):
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f.seek(offset + 0x1c)
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tag = f.read(4)
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if tag != b"$MN2":
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expected_tag = b"$MAN" if gen == 1 else b"$MN2"
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if tag != expected_tag:
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sys.exit("Wrong FTPR manifest tag ({}), this image may be corrupted"
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.format(tag))
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@ -536,11 +543,14 @@ if __name__ == "__main__":
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sys.exit("Relocation is not yet supported with custom whitelist or "
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"blacklist")
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f = open(args.file, "rb" if args.check or args.output else "r+b")
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f.seek(0x10)
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magic = f.read(4)
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gen = None
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if magic == b"$FPT":
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f = open(args.file, "rb" if args.check or args.output else "r+b")
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magic0 = f.read(4)
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f.seek(0x10)
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magic10 = f.read(4)
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if b"$FPT" in {magic0, magic10}:
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print("ME/TXE image detected")
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if args.descriptor or args.extract_descriptor or args.extract_me or \
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@ -552,17 +562,20 @@ if __name__ == "__main__":
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me_end = f.tell()
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mef = RegionFile(f, me_start, me_end)
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elif magic == b"\x5a\xa5\xf0\x0f":
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elif b"\x5a\xa5\xf0\x0f" in {magic0, magic10}:
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print("Full image detected")
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if args.truncate and not args.extract_me:
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sys.exit("-t requires a separated ME/TXE image (or --extract-me)")
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f.seek(0x14)
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flmap0, flmap1 = unpack("<II", f.read(8))
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f.seek(0x4 if magic0 == b"\x5a\xa5\xf0\x0f" else 0x14)
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flmap0, flmap1, flmap2 = unpack("<III", f.read(0xc))
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frba = flmap0 >> 12 & 0xff0
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fmba = (flmap1 & 0xff) << 4
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fpsba = flmap1 >> 12 & 0xff0
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# Generation 1
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fisba = flmap1 >> 12 & 0xff0
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fmsba = (flmap2 & 0xff) << 4
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# Generation 2-3
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fpsba = fisba
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f.seek(frba)
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flreg = unpack("<III", f.read(12))
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@ -572,119 +585,162 @@ if __name__ == "__main__":
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me_start, me_end = flreg_to_start_end(flreg[2])
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if me_start >= me_end:
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sys.exit("The ME/TXE region in this image has been disabled")
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print("The ME region in this image has already been disabled")
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else:
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mef = RegionFile(f, me_start, me_end)
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mef = RegionFile(f, me_start, me_end)
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if magic0 == b"\x5a\xa5\xf0\x0f":
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gen = 1
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mef.seek(0x10)
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if mef.read(4) != b"$FPT":
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sys.exit("The ME/TXE region is corrupted or missing")
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print("The ME/TXE region goes from {:#x} to {:#x}"
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.format(me_start, me_end))
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else:
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sys.exit("Unknown image")
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end_addr = me_end
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if me_start < me_end:
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mef.seek(0)
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if mef.read(4) == b"$FPT":
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fpt_offset = 0
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else:
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mef.seek(0x10)
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if mef.read(4) == b"$FPT":
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fpt_offset = 0x10
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else:
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if me_start > 0:
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sys.exit("The ME/TXE region is valid but the firmware is "
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"corrupted or missing")
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else:
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sys.exit("Unknown error")
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print("Found FPT header at {:#x}".format(mef.region_start + 0x10))
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if gen == 1:
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end_addr = 0
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else:
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end_addr = me_end
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mef.seek(0x14)
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entries = unpack("<I", mef.read(4))[0]
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print("Found {} partition(s)".format(entries))
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if me_start < me_end:
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print("Found FPT header at {:#x}".format(mef.region_start + fpt_offset))
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mef.seek(0x30)
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partitions = mef.read(entries * 0x20)
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mef.seek(fpt_offset + 0x4)
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entries = unpack("<I", mef.read(4))[0]
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print("Found {} partition(s)".format(entries))
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ftpr_header = b""
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mef.seek(fpt_offset + 0x20)
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partitions = mef.read(entries * 0x20)
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for i in range(entries):
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if partitions[i * 0x20:(i * 0x20) + 4] == b"FTPR":
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ftpr_header = partitions[i * 0x20:(i + 1) * 0x20]
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break
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ftpr_header = b""
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if ftpr_header == b"":
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sys.exit("FTPR header not found, this image doesn't seem to be valid")
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ftpr_offset, ftpr_length = unpack("<II", ftpr_header[0x08:0x10])
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print("Found FTPR header: FTPR partition spans from {:#x} to {:#x}"
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.format(ftpr_offset, ftpr_offset + ftpr_length))
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mef.seek(ftpr_offset)
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if mef.read(4) == b"$CPD":
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me11 = True
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num_entries = unpack("<I", mef.read(4))[0]
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mef.seek(ftpr_offset + 0x10)
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ftpr_mn2_offset = -1
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for i in range(0, num_entries):
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data = mef.read(0x18)
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name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
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offset = unpack("<I", data[0xc:0xf] + b"\x00")[0]
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if name == "FTPR.man":
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ftpr_mn2_offset = offset
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for i in range(entries):
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if partitions[i * 0x20:(i * 0x20) + 4] in {b"CODE", b"FTPR"}:
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ftpr_header = partitions[i * 0x20:(i + 1) * 0x20]
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break
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if ftpr_mn2_offset >= 0:
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check_mn2_tag(mef, ftpr_offset + ftpr_mn2_offset)
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print("Found FTPR manifest at {:#x}"
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.format(ftpr_offset + ftpr_mn2_offset))
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if ftpr_header == b"":
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sys.exit("FTPR header not found, this image doesn't seem to be "
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"valid")
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if ftpr_header[0x0:0x4] == b"CODE":
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gen = 1
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ftpr_offset, ftpr_length = unpack("<II", ftpr_header[0x08:0x10])
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print("Found FTPR header: FTPR partition spans from {:#x} to {:#x}"
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.format(ftpr_offset, ftpr_offset + ftpr_length))
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mef.seek(ftpr_offset)
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if mef.read(4) == b"$CPD":
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gen = 3
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num_entries = unpack("<I", mef.read(4))[0]
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mef.seek(ftpr_offset + 0x10)
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ftpr_mn2_offset = -1
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for i in range(0, num_entries):
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data = mef.read(0x18)
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name = data[0x0:0xc].rstrip(b"\x00").decode("ascii")
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offset = unpack("<I", data[0xc:0xf] + b"\x00")[0]
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if name == "FTPR.man":
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ftpr_mn2_offset = offset
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break
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if ftpr_mn2_offset >= 0:
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check_mn2_tag(mef, ftpr_offset + ftpr_mn2_offset, gen)
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print("Found FTPR manifest at {:#x}"
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.format(ftpr_offset + ftpr_mn2_offset))
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else:
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sys.exit("Can't find the manifest of the FTPR partition")
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else:
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sys.exit("Can't find the manifest of the FTPR partition")
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check_mn2_tag(mef, ftpr_offset, gen)
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ftpr_mn2_offset = 0
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if not gen:
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gen = 2
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else:
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check_mn2_tag(mef, ftpr_offset)
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me11 = False
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ftpr_mn2_offset = 0
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mef.seek(ftpr_offset + ftpr_mn2_offset + 0x24)
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version = unpack("<HHHH", mef.read(0x08))
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print("ME/TXE firmware version {} (generation {})"
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.format('.'.join(str(i) for i in version), gen))
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mef.seek(ftpr_offset + ftpr_mn2_offset + 0x24)
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version = unpack("<HHHH", mef.read(0x08))
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print("ME/TXE firmware version {}"
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.format('.'.join(str(i) for i in version)))
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mef.seek(ftpr_offset + ftpr_mn2_offset + 0x80)
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pubkey_md5 = hashlib.md5(mef.read(0x104)).hexdigest()
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mef.seek(ftpr_offset + ftpr_mn2_offset + 0x80)
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pubkey_md5 = hashlib.md5(mef.read(0x104)).hexdigest()
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if pubkey_md5 in pubkeys_md5:
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variant, pubkey_versions = pubkeys_md5[pubkey_md5]
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print("Public key match: Intel {}, firmware versions {}"
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.format(variant, ", ".join(pubkey_versions)))
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else:
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if version[0] >= 6:
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variant = "ME"
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if pubkey_md5 in pubkeys_md5:
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variant, pubkey_versions = pubkeys_md5[pubkey_md5]
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print("Public key match: Intel {}, firmware versions {}"
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.format(variant, ", ".join(pubkey_versions)))
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else:
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variant = "TXE"
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print("WARNING Unknown public key {}\n"
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" Assuming Intel {}\n"
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" Please report this warning to the project's maintainer!"
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.format(pubkey_md5, variant))
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if version[0] >= 6:
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variant = "ME"
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else:
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variant = "TXE"
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print("WARNING Unknown public key {}\n"
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" Assuming Intel {}\n"
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" Please report this warning to the project's "
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"maintainer!"
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.format(pubkey_md5, variant))
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if not args.check and args.output:
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f.close()
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shutil.copy(args.file, args.output)
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f = open(args.output, "r+b")
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mef = RegionFile(f, me_start, me_end)
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if me_start < me_end:
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mef = RegionFile(f, me_start, me_end)
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if me_start > 0:
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fdf = RegionFile(f, fd_start, fd_end)
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if me11:
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fdf.seek(fpsba)
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pchstrp0 = unpack("<I", fdf.read(4))[0]
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print("The HAP bit is " +
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("SET" if pchstrp0 & 1 << 16 else "NOT SET"))
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else:
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if gen == 1:
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for (ba, name) in ((fisba, "ICHSTRP0"), (fmsba, "MCHSTRP0")):
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fdf.seek(ba)
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strp = unpack("<I", fdf.read(4))[0]
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print("The meDisable bit in " + name + " is ", end="")
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if strp & 1:
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print("SET")
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else:
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print("NOT SET, setting it now...")
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fdf.write_to(ba, pack("<I", strp | 1))
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elif gen == 2:
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fdf.seek(fpsba + 0x28)
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pchstrp10 = unpack("<I", fdf.read(4))[0]
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print("The AltMeDisable bit is " +
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("SET" if pchstrp10 & 1 << 7 else "NOT SET"))
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else:
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fdf.seek(fpsba)
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pchstrp0 = unpack("<I", fdf.read(4))[0]
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print("The HAP bit is " +
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("SET" if pchstrp0 & 1 << 16 else "NOT SET"))
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# Generation 1: wipe everything and disable the ME region
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if gen == 1 and me_start < me_end:
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print("Disabling the ME region...")
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f.seek(frba + 0x8)
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f.write(pack("<I", 0x1fff))
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print("Wiping the ME region...")
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mef = RegionFile(f, me_start, me_end)
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mef.fill_all("\xff")
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# ME 6 Ignition: wipe everything
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me6_ignition = False
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if not args.check and not args.soft_disable_only and \
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if gen == 2 and not args.check and not args.soft_disable_only and \
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variant == "ME" and version[0] == 6:
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mef.seek(ftpr_offset + 0x20)
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num_modules = unpack("<I", mef.read(4))[0]
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@ -696,7 +752,7 @@ if __name__ == "__main__":
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mef.fill_all(b"\xff")
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me6_ignition = True
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if not args.check:
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if gen != 1 and not args.check:
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if not args.soft_disable_only and not me6_ignition:
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print("Reading partitions list...")
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unremovable_part_fpt = b""
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@ -769,7 +825,7 @@ if __name__ == "__main__":
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flags &= ~(0x00000001)
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mef.write_to(0x24, pack("<I", flags))
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if me11:
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if gen == 3:
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mef.seek(0x10)
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header = bytearray(mef.read(0x20))
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header[0x0b] = 0x00
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@ -787,9 +843,9 @@ if __name__ == "__main__":
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mef.write_to(0x1b, pack("B", checksum))
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print("Reading FTPR modules list...")
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if me11:
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if gen == 3:
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end_addr, ftpr_offset = \
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check_and_remove_modules_me11(mef, me_end,
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check_and_remove_modules_gen3(mef, me_end,
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ftpr_offset, ftpr_length,
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min_ftpr_offset,
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args.relocate,
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||||
|
@ -817,7 +873,7 @@ if __name__ == "__main__":
|
|||
f.truncate(end_addr)
|
||||
|
||||
if args.soft_disable or args.soft_disable_only:
|
||||
if me11:
|
||||
if gen == 3:
|
||||
print("Setting the HAP bit in PCHSTRP0 to disable Intel ME...")
|
||||
pchstrp0 |= (1 << 16)
|
||||
fdf.write_to(fpsba, pack("<I", pchstrp0))
|
||||
|
@ -829,7 +885,7 @@ if __name__ == "__main__":
|
|||
|
||||
if args.descriptor:
|
||||
print("Removing ME/TXE R/W access to the other flash regions...")
|
||||
if me11:
|
||||
if gen == 3:
|
||||
flmstr2 = 0x00400500
|
||||
else:
|
||||
fdf.seek(fmba + 0x4)
|
||||
|
@ -853,15 +909,20 @@ if __name__ == "__main__":
|
|||
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)
|
||||
if gen != 1:
|
||||
flreg2 = start_end_to_flreg(me_start, me_start + end_addr)
|
||||
|
||||
fdf_copy.seek(frba + 0x4)
|
||||
fdf_copy.write(pack("<II", flreg1, flreg2))
|
||||
fdf_copy.write(pack("<I", flreg1))
|
||||
if gen != 1:
|
||||
fdf_copy.write(pack("<I", 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")
|
||||
print("\nWARNING:\n"
|
||||
"The start address of the BIOS region (0x{:08x}) isn't "
|
||||
"equal to the end address\nof the ME region (0x{:08x}): "
|
||||
"if you want to recover the space from the ME \nregion "
|
||||
"you have to manually modify the descriptor.\n"
|
||||
.format(bios_start, me_end))
|
||||
else:
|
||||
print("Extracting the descriptor to \"{}\"..."
|
||||
.format(args.extract_descriptor))
|
||||
|
@ -869,26 +930,27 @@ if __name__ == "__main__":
|
|||
|
||||
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 gen != 1:
|
||||
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 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)
|
||||
print("Checking the FTPR RSA signature... ", end="")
|
||||
print_check_partition_signature(mef, ftpr_offset + ftpr_mn2_offset)
|
||||
|
||||
f.close()
|
||||
|
||||
|
|
Loading…
Reference in a new issue