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Add EDK2 FTW parser

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This commit is contained in:
Nikolaj Schlej 2025-02-23 11:25:27 +07:00
parent e00fc916bb
commit 271465eb61
8 changed files with 331 additions and 6 deletions
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77
common/nvramparser.cpp
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@ -28,6 +28,7 @@
#include "generated/ami_nvar.h"
#include "generated/edk2_vss.h"
#include "generated/edk2_vss2.h"
#include "generated/edk2_ftw.h"
#include "generated/insyde_fdc.h"
USTATUS NvramParser::parseNvarStore(const UModelIndex & index)
@ -660,7 +661,76 @@ USTATUS NvramParser::parseNvramVolumeBody(const UModelIndex & index,const UINT32
// Do not try any other parsers if we are here for FDC store parsing
if (fdcStoreSizeOverride == 0) {
// FTW
try {
if (volumeBodySize - storeOffset < sizeof(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER32)) {
// No need to parse further, the rest of the volume is too small
throw 0;
}
UByteArray ftw = volumeBody.mid(storeOffset);
umemstream is(ftw.constData(), ftw.size());
kaitai::kstream ks(&is);
edk2_ftw_t parsed(&ks);
UINT64 storeSize;
UINT64 headerSize;
UINT32 calculatedCrc;
UByteArray header;
if (parsed._is_null_len_write_queue_64()) {
headerSize = parsed.len_ftw_store_header_32();
storeSize = headerSize + parsed.len_write_queue_32();
header = ftw.left(headerSize);
// Check block header checksum
UByteArray crcHeader = header;
EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER32* crcFtwBlockHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER32*)crcHeader.data();
crcFtwBlockHeader->Crc = emptyByte ? 0xFFFFFFFF : 0;
crcFtwBlockHeader->State = emptyByte ? 0xFF : 0;
calculatedCrc = (UINT32)crc32(0, (const UINT8*)crcFtwBlockHeader, (UINT32)headerSize);
}
else {
headerSize = parsed.len_ftw_store_header_64();
storeSize = headerSize + parsed.len_write_queue_32() + (((UINT64)parsed.len_write_queue_64()) << 32);
header = ftw.left(headerSize);
// Check block header checksum
UByteArray crcHeader = header;
EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER64* crcFtwBlockHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER64*)crcHeader.data();
crcFtwBlockHeader->Crc = emptyByte ? 0xFFFFFFFF : 0;
crcFtwBlockHeader->State = emptyByte ? 0xFF : 0;
calculatedCrc = (UINT32)crc32(0, (const UINT8*)crcFtwBlockHeader, (UINT32)headerSize);
}
// FTW store at current offset parsed correctly
// Check if we need to add a padding before it
if (!outerPadding.isEmpty()) {
UString info = usprintf("Full size: %Xh (%u)", (UINT32)outerPadding.size(), (UINT32)outerPadding.size());
model->addItem(previousStoreEndOffset, Types::Padding, getPaddingType(outerPadding), UString("Padding"), UString(), info, UByteArray(), outerPadding, UByteArray(), Fixed, index);
outerPadding.clear();
}
// Construct header and body
UByteArray body = ftw.mid(header.size(), storeSize - header.size());
// Add info
const EFI_GUID* guid = (const EFI_GUID*)header.constData();
UString name = UString("FTW store");
UString info = UString("Signature: ") + guidToUString(*guid, false);
info += usprintf("\nFull size: %Xh (%u)\nHeader size: %Xh (%u)\nBody size: %Xh (%u)\nState: %02Xh\nHeader CRC32: %08Xh",
(UINT32)storeSize, (UINT32)storeSize,
(UINT32)header.size(), (UINT32)header.size(),
(UINT32)body.size(), (UINT32)body.size(),
parsed.state(),
parsed.crc()) + (parsed.crc() != calculatedCrc ? usprintf(", invalid, should be %08Xh", calculatedCrc) : UString(", valid"));
// Add header tree item
UModelIndex headerIndex = model->addItem(localOffset + storeOffset, Types::FtwStore, 0, name, UString(), info, header, body, UByteArray(), Fixed, index);
storeFound = true;
storeOffset += storeSize;
previousStoreEndOffset = storeOffset;
} catch (...) {
// Parsing failed, try something else
}
// Insyde FDC
try {
if (volumeBodySize - storeOffset < sizeof(FDC_VOLUME_HEADER)) {
@ -693,10 +763,10 @@ USTATUS NvramParser::parseNvramVolumeBody(const UModelIndex & index,const UINT32
(UINT32)header.size(), (UINT32)header.size(),
(UINT32)body.size(), (UINT32)body.size());
// Add header tree item with modified body
// Add header tree item
UModelIndex headerIndex = model->addItem(localOffset + storeOffset, Types::FdcStore, 0, name, UString(), info, header, body, UByteArray(), Fixed, index);
// Parse modified FDC body as normal VSS/VSS2 storage
// Parse FDC body as normal VSS/VSS2 storage with size override
parseNvramVolumeBody(headerIndex, (UINT32)body.size());
storeFound = true;
@ -706,7 +776,6 @@ USTATUS NvramParser::parseNvramVolumeBody(const UModelIndex & index,const UINT32
// Parsing failed, try something else
}
// Apple Fsys/Gaid
// Phoenix EVSA