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Fix possible unaligned access to UCS2 strings

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This commit is contained in:
Nikolaj Schlej 2023-01-31 20:15:12 -08:00
parent 20d0155130
commit c9939e23ec
7 changed files with 47 additions and 66 deletions
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10
UEFITool/ffsfinder.cpp
View File

@ -61,13 +61,11 @@ USTATUS FfsFinder::findHexPattern(const UModelIndex & index, const UByteArray &
QRegularExpressionMatch regexpmatch;
INT32 offset = 0;
while ((offset = (INT32)hexBody.indexOf(regexp, (qsizetype)offset, &regexpmatch)) != -1)
{
while ((offset = (INT32)hexBody.indexOf(regexp, (qsizetype)offset, &regexpmatch)) != -1) {
#else
QRegExp regexp = QRegExp(UString(hexPattern), Qt::CaseInsensitive);
INT32 offset = regexp.indexIn(hexBody);
while (offset >= 0) {
#endif
@ -223,11 +221,7 @@ USTATUS FfsFinder::findHexPattern(const UModelIndex & index, const UByteArray &
UString data;
if (unicode)
#if QT_VERSION_MAJOR >= 6
data = UString::fromUtf16((const char16_t*)body.constData(), (int)(body.length() / 2));
#else
data = UString::fromUtf16((const ushort*)body.constData(), (int)(body.length() / 2));
#endif
data = uFromUcs2(body.constData(), body.length() / 2);
else
data = UString::fromLatin1((const char*)body.constData(), body.length());

3
UEFITool/uefitool.cpp
View File

@ -807,7 +807,6 @@ void UEFITool::showParserMessages()
#if QT_VERSION_MAJOR < 6
std::pair<QString, QModelIndex> msg;
foreach (msg, messages)
#else
for (const auto &msg : messages)
@ -832,7 +831,6 @@ void UEFITool::showFinderMessages()
#if QT_VERSION_MAJOR < 6
std::pair<QString, QModelIndex> msg;
foreach (msg, messages)
#else
for (const auto &msg : messages)
@ -858,7 +856,6 @@ void UEFITool::showBuilderMessages()
#if QT_VERSION_MAJOR < 6
std::pair<QString, QModelIndex> msg;
foreach (msg, messages)
#else
for (const auto &msg : messages)

10
common/bstrlib/bstrwrap.h
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@ -373,16 +373,6 @@ struct CBString : public tagbstring {
CBString mid(int pos, int len) const { return midstr(pos, len); }
CBString chopped(int len) const { return midstr(slen - len, len); }
void chop(int len) { trunc(((slen > len) ? slen - len : 0)); }
static CBString fromUtf16(const unsigned short* str) {
// Naive implementation assuming that only ASCII LE part of UCS2 is used, str may not be aligned.
CBString msg;
const char *str8 = reinterpret_cast<const char *>(str);
while (str8[0]) {
msg += str8[0];
str8 += 2;
}
return msg;
}
CBString leftJustified(int length) { if (length > slen) { return *this + CBString(' ', length - slen); } return *this; }
};
extern const CBString operator + (const char *a, const CBString& b);

14
common/ffsparser.cpp
View File

@ -1122,7 +1122,7 @@ USTATUS FfsParser::parseVolumeHeader(const UByteArray & volume, const UINT32 loc
// Check attributes
// Determine value of empty byte
UINT8 emptyByte = volumeHeader->Attributes & EFI_FVB_ERASE_POLARITY ? '\xFF' : '\x00';
UINT8 emptyByte = volumeHeader->Attributes & EFI_FVB_ERASE_POLARITY ? 0xFF : 0x00;
// Check for AppleCRC32 and UsedSpace in ZeroVector
bool hasAppleCrc32 = false;
@ -2941,11 +2941,7 @@ USTATUS FfsParser::parseVersionSectionBody(const UModelIndex & index)
return U_INVALID_PARAMETER;
// Add info
#if QT_VERSION_MAJOR >= 6
model->addInfo(index, UString("\nVersion string: ") + UString::fromUtf16((const char16_t*)model->body(index).constData()));
#else
model->addInfo(index, UString("\nVersion string: ") + UString::fromUtf16((const CHAR16*)model->body(index).constData()));
#endif
model->addInfo(index, UString("\nVersion string: ") + uFromUcs2(model->body(index).constData()));
return U_SUCCESS;
}
@ -3082,11 +3078,7 @@ USTATUS FfsParser::parseUiSectionBody(const UModelIndex & index)
if (!index.isValid())
return U_INVALID_PARAMETER;
#if QT_VERSION_MAJOR >= 6
UString text = UString::fromUtf16((const char16_t*)model->body(index).constData());
#else
UString text = UString::fromUtf16((const CHAR16*)model->body(index).constData());
#endif
UString text = uFromUcs2(model->body(index).constData());
// Add info
model->addInfo(index, UString("\nText: ") + text);

49
common/nvramparser.cpp
View File

@ -258,12 +258,7 @@ USTATUS NvramParser::parseNvarStore(const UModelIndex & index)
nameSize = (UINT32)(text.length() + 1);
}
else { // Name is stored as UCS2 string of CHAR16s
#if QT_VERSION_MAJOR >= 6
text = UString::fromUtf16((char16_t*)namePtr);
#else
text = UString::fromUtf16((CHAR16*)namePtr);
#endif
text = uFromUcs2(namePtr);
nameSize = (UINT32)((text.length() + 1) * 2);
}
@ -539,7 +534,9 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
UINT32 offset = storeOffset;
for (; offset < dataSize - sizeof(UINT32); offset++) {
const UINT32* currentPos = (const UINT32*)(volume.constData() + offset);
if (*currentPos == NVRAM_VSS_STORE_SIGNATURE || *currentPos == NVRAM_APPLE_SVS_STORE_SIGNATURE || *currentPos == NVRAM_APPLE_NSS_STORE_SIGNATURE) { // $VSS, $SVS or $NSS signatures found, perform checks
if (readUnaligned(currentPos) == NVRAM_VSS_STORE_SIGNATURE
|| readUnaligned(currentPos) == NVRAM_APPLE_SVS_STORE_SIGNATURE
|| readUnaligned(currentPos) == NVRAM_APPLE_NSS_STORE_SIGNATURE) { // $VSS, $SVS or $NSS signatures found, perform checks
const VSS_VARIABLE_STORE_HEADER* vssHeader = (const VSS_VARIABLE_STORE_HEADER*)currentPos;
if (vssHeader->Format != NVRAM_VSS_VARIABLE_STORE_FORMATTED) {
msg(usprintf("%s: VSS store candidate at offset %Xh skipped, has invalid format %02Xh", __FUNCTION__, localOffset + offset, vssHeader->Format), index);
@ -552,7 +549,8 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_VSS2_AUTH_VAR_KEY_DATABASE_GUID_PART1 || *currentPos == NVRAM_VSS2_STORE_GUID_PART1) { // VSS2 store signatures found, perform checks
else if (readUnaligned(currentPos) == NVRAM_VSS2_AUTH_VAR_KEY_DATABASE_GUID_PART1
|| readUnaligned(currentPos) == NVRAM_VSS2_STORE_GUID_PART1) { // VSS2 store signatures found, perform checks
UByteArray guid = UByteArray(volume.constData() + offset, sizeof(EFI_GUID));
if (guid != NVRAM_VSS2_AUTH_VAR_KEY_DATABASE_GUID && guid != NVRAM_VSS2_STORE_GUID) // Check the whole signature
continue;
@ -569,7 +567,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_FDC_VOLUME_SIGNATURE) { // FDC signature found
else if (readUnaligned(currentPos) == NVRAM_FDC_VOLUME_SIGNATURE) { // FDC signature found
const FDC_VOLUME_HEADER* fdcHeader = (const FDC_VOLUME_HEADER*)currentPos;
if (fdcHeader->Size == 0 || fdcHeader->Size == 0xFFFFFFFF) {
msg(usprintf("%s: FDC store candidate at offset %Xh skipped, has invalid size %Xh", __FUNCTION__, localOffset + offset, fdcHeader->Size), index);
@ -578,7 +576,8 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_APPLE_FSYS_STORE_SIGNATURE || *currentPos == NVRAM_APPLE_GAID_STORE_SIGNATURE) { // Fsys or Gaid signature found
else if (readUnaligned(currentPos) == NVRAM_APPLE_FSYS_STORE_SIGNATURE
|| readUnaligned(currentPos) == NVRAM_APPLE_GAID_STORE_SIGNATURE) { // Fsys or Gaid signature found
const APPLE_FSYS_STORE_HEADER* fsysHeader = (const APPLE_FSYS_STORE_HEADER*)currentPos;
if (fsysHeader->Size == 0 || fsysHeader->Size == 0xFFFF) {
msg(usprintf("%s: Fsys store candidate at offset %Xh skipped, has invalid size %Xh", __FUNCTION__, localOffset + offset, fsysHeader->Size), index);
@ -587,7 +586,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_EVSA_STORE_SIGNATURE) { //EVSA signature found
else if (readUnaligned(currentPos) == NVRAM_EVSA_STORE_SIGNATURE) { //EVSA signature found
if (offset < sizeof(UINT32))
continue;
@ -604,7 +603,8 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
offset -= sizeof(UINT32);
break;
}
else if (*currentPos == NVRAM_MAIN_STORE_VOLUME_GUID_DATA1 || *currentPos == EDKII_WORKING_BLOCK_SIGNATURE_GUID_DATA1) { // Possible FTW block signature found
else if (readUnaligned(currentPos) == NVRAM_MAIN_STORE_VOLUME_GUID_DATA1
|| readUnaligned(currentPos) == EDKII_WORKING_BLOCK_SIGNATURE_GUID_DATA1) { // Possible FTW block signature found
UByteArray guid = UByteArray(volume.constData() + offset, sizeof(EFI_GUID));
if (guid != NVRAM_MAIN_STORE_VOLUME_GUID && guid != EDKII_WORKING_BLOCK_SIGNATURE_GUID && guid != VSS2_WORKING_BLOCK_SIGNATURE_GUID) // Check the whole signature
continue;
@ -630,7 +630,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_PHOENIX_FLASH_MAP_SIGNATURE_PART1) {// Phoenix SCT flash map
else if (readUnaligned(currentPos) == NVRAM_PHOENIX_FLASH_MAP_SIGNATURE_PART1) {// Phoenix SCT flash map
UByteArray signature = UByteArray(volume.constData() + offset, NVRAM_PHOENIX_FLASH_MAP_SIGNATURE_LENGTH);
if (signature != NVRAM_PHOENIX_FLASH_MAP_SIGNATURE) // Check the whole signature
continue;
@ -638,7 +638,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == NVRAM_PHOENIX_CMDB_HEADER_SIGNATURE) { // Phoenix SCT CMDB store
else if (readUnaligned(currentPos) == NVRAM_PHOENIX_CMDB_HEADER_SIGNATURE) { // Phoenix SCT CMDB store
const PHOENIX_CMDB_HEADER* cmdbHeader = (const PHOENIX_CMDB_HEADER*)currentPos;
// Check size
@ -648,7 +648,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == INTEL_MICROCODE_HEADER_VERSION_1) {// Intel microcode
else if (readUnaligned(currentPos) == INTEL_MICROCODE_HEADER_VERSION_1) {// Intel microcode
const INTEL_MICROCODE_HEADER* ucodeHeader = (const INTEL_MICROCODE_HEADER*)currentPos;
// TotalSize is greater then DataSize and is multiple of 1024
@ -659,7 +659,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
// All checks passed, store found
break;
}
else if (*currentPos == OEM_ACTIVATION_PUBKEY_MAGIC) { // SLIC pubkey
else if (readUnaligned(currentPos) == OEM_ACTIVATION_PUBKEY_MAGIC) { // SLIC pubkey
if (offset < 4 * sizeof(UINT32))
continue;
@ -672,7 +672,7 @@ USTATUS NvramParser::findNextStore(const UModelIndex & index, const UByteArray &
offset -= 4 * sizeof(UINT32);
break;
}
else if (*currentPos == OEM_ACTIVATION_MARKER_WINDOWS_FLAG_PART1) { // SLIC marker
else if (readUnaligned(currentPos) == OEM_ACTIVATION_MARKER_WINDOWS_FLAG_PART1) { // SLIC marker
if (offset < 26
|| offset >= dataSize - sizeof(UINT64)
|| *(const UINT64*)currentPos != OEM_ACTIVATION_MARKER_WINDOWS_FLAG) // Check full windows flag and structure size
@ -1504,12 +1504,7 @@ USTATUS NvramParser::parseVssStoreBody(const UModelIndex & index, UINT8 alignmen
else { // Add GUID and text for valid variables
name = guidToUString(readUnaligned(variableGuid));
info += UString("Variable GUID: ") + guidToUString(readUnaligned(variableGuid), false) + "\n";
#if QT_VERSION_MAJOR >= 6
text = UString::fromUtf16((char16_t *)variableName);
#else
text = UString::fromUtf16(variableName);
#endif
text = uFromUcs2((const char*)variableName);
}
// Add info
@ -1741,13 +1736,7 @@ USTATUS NvramParser::parseEvsaStoreBody(const UModelIndex & index)
const EVSA_NAME_ENTRY* nameHeader = (const EVSA_NAME_ENTRY*)entryHeader;
header = data.mid(offset, sizeof(EVSA_NAME_ENTRY));
body = data.mid(offset + sizeof(EVSA_NAME_ENTRY), nameHeader->Header.Size - sizeof(EVSA_NAME_ENTRY));
#if QT_VERSION_MAJOR >= 6
name = UString::fromUtf16((const char16_t *)body.constData());
#else
name = UString::fromUtf16((const CHAR16*)body.constData());
#endif
name = uFromUcs2(body.constData());
info = UString("Name: ") + name
+ usprintf("\nFull size: %Xh (%u)\nHeader size: %Xh (%u)\nBody size: %Xh (%u)\nType: %02Xh\nChecksum: %02Xh",
variableSize, variableSize,

18
common/ustring.cpp
View File

@ -11,6 +11,8 @@
*/
#include "ustring.h"
#include <cstddef>
#include <cstdint>
#include <stdarg.h>
#if defined(QT_CORE_LIB)
@ -104,3 +106,19 @@ UString urepeated(char c, int len)
return UString(c, len);
}
#endif
UString uFromUcs2(const char* str, size_t max_len)
{
// Naive implementation assuming that only ASCII LE part of UCS2 is used, str may not be aligned.
UString msg;
const char *str8 = str;
size_t rest = (max_len == 0) ? SIZE_MAX : max_len;
if (max_len == 0) {
while (str8[0] && rest) {
msg += str8[0];
str8 += 2;
rest--;
}
}
return msg;
}

1
common/ustring.h
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@ -29,5 +29,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
UString usprintf(const char* fmt, ...) ATTRIBUTE_FORMAT_(printf, 1, 2);
UString urepeated(char c, int len);
UString uFromUcs2(const char* str, size_t max_len = 0);
#endif // USTRING_H