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Find FPT header in all ME region (needed for new flash format) #269

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Find FPT header in all ME region (needed for new flash format) #269

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Find FPT header in all ME region (needed for new flash format)
davidmartinzeus Apr 8, 2019
4f70d36
ME 12.x.x.x public key
davidmartinzeus Apr 9, 2019
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32 changes: 19 additions & 13 deletions me_cleaner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
import itertools
import shutil
import sys
import re
from struct import pack, unpack


Expand All @@ -44,6 +45,7 @@
"2011ae6df87c40fba09e3f20459b1ce0": ("ME", ("9.0.x.x", "9.1.x.x")),
"e8427c5691cf8b56bc5cdd82746957ed": ("ME", ("9.5.x.x", "10.x.x.x")),
"986a78e481f185f7d54e4af06eb413f6": ("ME", ("11.x.x.x",)),
"3efc26920b4bee901b624771c742887b": ("ME", ("12.x.x.x",)),
"bda0b6bb8ca0bf0cac55ac4c4d55e0f2": ("TXE", ("1.x.x.x",)),
"b726a2ab9cd59d4e62fe2bead7cf6997": ("TXE", ("1.x.x.x",)),
"0633d7f951a3e7968ae7460861be9cfb": ("TXE", ("2.x.x.x",)),
Expand All @@ -64,6 +66,13 @@ def __init__(self, f, region_start, region_end):
self.region_start = region_start
self.region_end = region_end

def readall(self):
currentpos = self.f.tell()
self.f.seek(self.region_start)
toret = self.f.read(self.region_end - self.region_start)
self.f.seek(currentpos)
return toret

def read(self, n):
if f.tell() + n <= self.region_end:
return self.f.read(n)
Expand Down Expand Up @@ -596,19 +605,16 @@ def start_end_to_flreg(start, end):
sys.exit("Unknown image")

if me_start < me_end:
mef.seek(0)
if mef.read(4) == b"$FPT":
fpt_offset = 0
else:
mef.seek(0x10)
if mef.read(4) == b"$FPT":
fpt_offset = 0x10
else:
if me_start > 0:
sys.exit("The ME/TXE region is valid but the firmware is "
"corrupted or missing")
else:
sys.exit("Unknown error")
medata = mef.readall()
fpt_matches = list((re.compile(br'\x24\x46\x50\x54.\x00\x00\x00', re.DOTALL)).finditer(medata))
if (len(fpt_matches) == 0):
sys.exit("$FPT not found")

if (len(fpt_matches) > 1):
sys.exit("more than one $FPT found")

for fpt_match in fpt_matches:
fpt_offset = fpt_match.span()[0]

if gen == 1:
end_addr = 0
Expand Down