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Dell PFS Update Extractor v5.1

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Fixed BIOS Guard (PFAT) PFS Entry Signature parsing bug
Minor improvement in BIOS Guard (PFAT) PFS Entry detection
This commit is contained in:
platomav 2022-01-05 16:44:58 +02:00
parent ec14803065
commit e56aa66895
1 changed files with 3 additions and 3 deletions
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6
Dell PFS Update Extractor/Dell_PFS_Extract.py
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@ -7,7 +7,7 @@ Dell PFS Update Extractor
Copyright (C) 2018-2021 Plato Mavropoulos Copyright (C) 2018-2021 Plato Mavropoulos
""" """
title = 'Dell PFS Update Extractor v5.0' title = 'Dell PFS Update Extractor v5.1'
import sys import sys
@ -702,7 +702,7 @@ def pfs_extract(buffer, pfs_index, pfs_name, pfs_count, output_path, pfs_padd) :
pfat_entry_hdr = get_struct(entry_data, 0, PFS_DELL_HDR, None, pfs_padd + 8) # Possible PFS PFAT Entry pfat_entry_hdr = get_struct(entry_data, 0, PFS_DELL_HDR, None, pfs_padd + 8) # Possible PFS PFAT Entry
if len(entry_data) - pfat_hdr_off >= pfat_hdr_size : if len(entry_data) - pfat_hdr_off >= pfat_hdr_size :
pfat_hdr = get_struct(entry_data, pfat_hdr_off, PFS_PFAT_HDR, [0], pfs_padd + 8) pfat_hdr = get_struct(entry_data, pfat_hdr_off, PFS_PFAT_HDR, [0], pfs_padd + 8)
is_pfat = bytes(pfat_hdr.PlatformID).startswith((b'Dell',b'DELL')) is_pfat = bytes(pfat_hdr.PlatformID).upper().startswith(b'DELL')
# Parse PFS Entry which contains sub-PFS Volume with PFAT Payload # Parse PFS Entry which contains sub-PFS Volume with PFAT Payload
if pfat_entry_hdr.Tag == b'PFS.HDR.' and is_pfat : if pfat_entry_hdr.Tag == b'PFS.HDR.' and is_pfat :
@ -894,7 +894,7 @@ def parse_pfat_pfs(entry_hdr, entry_data, padd) :
msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry Header & PFAT Size mismatch!') msg_print(padd + 16, 'Error: Detected sub-PFS PFAT Entry Header & PFAT Size mismatch!')
# Parse sub-PFS PFAT Signature, if applicable (only when PFAT Header > SFAM flag is set) # Parse sub-PFS PFAT Signature, if applicable (only when PFAT Header > SFAM flag is set)
if pfat_flag_sig and pfat_payload[pfat_payload_end:pfat_payload_end + pfat_sig_size] == pfat_sig_size : if pfat_flag_sig and len(pfat_payload[pfat_payload_end:pfat_payload_end + pfat_sig_size]) == pfat_sig_size :
# Get sub-PFS PFAT Signature Structure values # Get sub-PFS PFAT Signature Structure values
pfat_sig = get_struct(pfat_payload, pfat_payload_end, PFS_PFAT_SIG, [pfat_entry_index], padd + 12) pfat_sig = get_struct(pfat_payload, pfat_payload_end, PFS_PFAT_SIG, [pfat_entry_index], padd + 12)