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PhoenixAnalyzer: Detect low register table segment values

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RichardG867
2024-02-01 19:52:31 -03:00
parent ed487bd55c
commit c54a6b149f
1 changed files with 17 additions and 8 deletions
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25
biostools/analyzers.py
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@@ -2054,7 +2054,7 @@ class PhoenixAnalyzer(Analyzer):
self._phoenix_pattern = re.compile(b'''Phoenix (?:Technologies Ltd|Software Associates|Compatibility Corp|ROM BIOS)|PPhhooeenniixx TTeecchhnnoollooggiieess|\\x00IBM AT Compatible Phoenix NuBIOS''')
self._ignore_pattern = re.compile(b'''search=f000,0,ffff,S,"|\\x00\\xC3\\x82as Ltd. de Phoenix del \\xC2\\x83 de Tecnolog\\xC3\\x83\\x00''')
self._bcpsegment_pattern = re.compile(b'''BCPSEGMENT''')
self._valid_id_pattern = re.compile('''[\\x00\\x20-\\x7E]{8,}''')
self._valid_id_pattern = re.compile(b'''[\\x20-\\x7E][\\x00\\x20-\\x7E]{7,}''')
self._rombios_version_pattern = re.compile(
b'''(?:Phoenix )?''' # Phoenix brand (not always present)
@@ -2971,15 +2971,24 @@ class PhoenixAnalyzer(Analyzer):
if bcpost and len(bcpost.data) >= 0x1d:
version_offset, = struct.unpack('<H', bcpost.data[0x1b:0x1d])
version_offset += regtable_segment << 4
version_string = util.read_string(virtual_mem[version_offset:version_offset + 4096])
version_string = virtual_mem[version_offset:version_offset + 4096]
if not self._valid_id_pattern.match(version_string):
self.debug_print('Potentially bogus ID string, changing register table segment from', hex(regtable_segment), 'to 0xf000')
# DMI at 0000 is valid (Siemens Nixdorf 4.06)
if regtable_segment == 0x0000:
dmi_segment = regtable_segment
prev_regtable_segment = regtable_segment
if regtable_segment < 0x8000:
# Some images report a bogus table segment such as
# 0x5000 (DEC 440LX DEVEL61F). This can probably be
# made to check for segments beyond the image size.
regtable_segment |= 0x8000
else:
dmi_segment = 0xf000
regtable_segment = 0xf000
# DMI at 0000 is valid (Siemens Nixdorf 4.06)
if regtable_segment == 0x0000:
dmi_segment = regtable_segment
else:
dmi_segment = 0xf000
regtable_segment = 0xf000
self.debug_print('Potentially bogus ID string, changing register table segment from', hex(prev_regtable_segment), 'to', hex(regtable_segment))
else:
version_string = util.read_string(version_string)
elif regtable_segment <= 0xe31f:
# Old strategy (set by HP Brio 80xx) as a backup.
self.debug_print('No BCPOST and register table segment', hex(regtable_segment), 'appears low, changing to 0xf000')