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TraceRecord.cpp
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TraceRecord.cpp
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#include "TraceRecord.h"
#include "zydis_wrapper.h"
#include "module.h"
#include "memory.h"
#include "threading.h"
#include "plugin_loader.h"
TraceRecordManager TraceRecord;
TraceRecordManager::TraceRecordManager() : instructionCounter(0)
{
ModuleNames.emplace_back("");
}
TraceRecordManager::~TraceRecordManager()
{
clear();
}
void TraceRecordManager::clear()
{
EXCLUSIVE_ACQUIRE(LockTraceRecord);
for(auto i = TraceRecord.begin(); i != TraceRecord.end(); ++i)
efree(i->second.rawPtr, "TraceRecordManager");
TraceRecord.clear();
ModuleNames.clear();
ModuleNames.emplace_back("");
}
bool TraceRecordManager::setTraceRecordType(duint pageAddress, TraceRecordType type)
{
EXCLUSIVE_ACQUIRE(LockTraceRecord);
pageAddress &= ~((duint)4096 - 1);
auto pageInfo = TraceRecord.find(ModHashFromAddr(pageAddress));
if(pageInfo == TraceRecord.end())
{
if(type != TraceRecordType::TraceRecordNone)
{
TraceRecordPage newPage;
char modName[MAX_MODULE_SIZE];
switch(type)
{
case TraceRecordBitExec:
newPage.rawPtr = emalloc(4096 / 8, "TraceRecordManager");
memset(newPage.rawPtr, 0, 4096 / 8);
break;
case TraceRecordByteWithExecTypeAndCounter:
newPage.rawPtr = emalloc(4096, "TraceRecordManager");
memset(newPage.rawPtr, 0, 4096);
break;
case TraceRecordWordWithExecTypeAndCounter:
newPage.rawPtr = emalloc(4096 * 2, "TraceRecordManager");
memset(newPage.rawPtr, 0, 4096 * 2);
break;
default:
return false;
}
newPage.dataType = type;
if(ModNameFromAddr(pageAddress, modName, true))
{
newPage.rva = pageAddress - ModBaseFromAddr(pageAddress);
newPage.moduleIndex = getModuleIndex(std::string(modName));
}
else
newPage.moduleIndex = ~0;
auto inserted = TraceRecord.insert(std::make_pair(ModHashFromAddr(pageAddress), newPage));
if(inserted.second == false) // we failed to insert new page into the map
{
efree(newPage.rawPtr);
return false;
}
return true;
}
else
return true;
}
else
{
if(type == TraceRecordType::TraceRecordNone)
{
if(pageInfo != TraceRecord.end())
{
efree(pageInfo->second.rawPtr, "TraceRecordManager");
TraceRecord.erase(pageInfo);
}
return true;
}
else
return pageInfo->second.dataType == type; //Can't covert between data types
}
}
TraceRecordManager::TraceRecordType TraceRecordManager::getTraceRecordType(duint pageAddress)
{
SHARED_ACQUIRE(LockTraceRecord);
pageAddress &= ~((duint)4096 - 1);
auto pageInfo = TraceRecord.find(ModHashFromAddr(pageAddress));
if(pageInfo == TraceRecord.end())
return TraceRecordNone;
else
return pageInfo->second.dataType;
}
void TraceRecordManager::TraceExecute(duint address, duint size)
{
SHARED_ACQUIRE(LockTraceRecord);
if(size == 0)
return;
duint base = address & ~((duint)4096 - 1);
auto pageInfoIterator = TraceRecord.find(ModHashFromAddr(base));
if(pageInfoIterator == TraceRecord.end())
return;
TraceRecordPage pageInfo;
pageInfo = pageInfoIterator->second;
duint offset = address - base;
bool isMixed;
if((offset + size) > 4096) // execution crossed page boundary, splitting into 2 sub calls. Noting that byte type may be mislabelled.
{
SHARED_RELEASE();
TraceExecute(address, 4096 - offset);
TraceExecute(base + 4096, size + offset - 4096);
return;
}
isMixed = false;
switch(pageInfo.dataType)
{
case TraceRecordType::TraceRecordBitExec:
for(unsigned char i = 0; i < size; i++)
*((char*)pageInfo.rawPtr + (i + offset) / 8) |= 1 << ((i + offset) % 8);
break;
case TraceRecordType::TraceRecordByteWithExecTypeAndCounter:
for(unsigned char i = 0; i < size; i++)
{
TraceRecordByteType_2bit currentByteType;
if(isMixed)
currentByteType = TraceRecordByteType_2bit::_InstructionOverlapped;
else if(i == 0)
currentByteType = TraceRecordByteType_2bit::_InstructionHeading;
else if(i == size - 1)
currentByteType = TraceRecordByteType_2bit::_InstructionTailing;
else
currentByteType = TraceRecordByteType_2bit::_InstructionBody;
char* data = (char*)pageInfo.rawPtr + offset + i;
if(*data == 0)
{
*data = (char)currentByteType << 6 | 1;
}
else
{
isMixed |= (*data & 0xC0) >> 6 == currentByteType;
*data = ((char)currentByteType << 6) | ((*data & 0x3F) == 0x3F ? 0x3F : (*data & 0x3F) + 1);
}
}
if(isMixed)
for(unsigned char i = 0; i < size; i++)
*((char*)pageInfo.rawPtr + i + offset) |= 0xC0;
break;
case TraceRecordType::TraceRecordWordWithExecTypeAndCounter:
for(unsigned char i = 0; i < size; i++)
{
TraceRecordByteType_2bit currentByteType;
if(isMixed)
currentByteType = TraceRecordByteType_2bit::_InstructionOverlapped;
else if(i == 0)
currentByteType = TraceRecordByteType_2bit::_InstructionHeading;
else if(i == size - 1)
currentByteType = TraceRecordByteType_2bit::_InstructionTailing;
else
currentByteType = TraceRecordByteType_2bit::_InstructionBody;
short* data = (short*)pageInfo.rawPtr + offset + i;
if(*data == 0)
{
*data = (char)currentByteType << 14 | 1;
}
else
{
isMixed |= (*data & 0xC0) >> 6 == currentByteType;
*data = ((char)currentByteType << 14) | ((*data & 0x3FFF) == 0x3FFF ? 0x3FFF : (*data & 0x3FFF) + 1);
}
}
if(isMixed)
for(unsigned char i = 0; i < size; i++)
*((short*)pageInfo.rawPtr + i + offset) |= 0xC000;
break;
default:
break;
}
}
unsigned int TraceRecordManager::getHitCount(duint address)
{
SHARED_ACQUIRE(LockTraceRecord);
duint base = address & ~((duint)4096 - 1);
auto pageInfoIterator = TraceRecord.find(ModHashFromAddr(base));
if(pageInfoIterator == TraceRecord.end())
return 0;
else
{
TraceRecordPage pageInfo = pageInfoIterator->second;
duint offset = address - base;
switch(pageInfo.dataType)
{
case TraceRecordType::TraceRecordBitExec:
return ((char*)pageInfo.rawPtr)[offset / 8] & (1 << (offset % 8)) ? 1 : 0;
case TraceRecordType::TraceRecordByteWithExecTypeAndCounter:
return ((char*)pageInfo.rawPtr)[offset] & 0x3F;
case TraceRecordType::TraceRecordWordWithExecTypeAndCounter:
return ((short*)pageInfo.rawPtr)[offset] & 0x3FFF;
default:
return 0;
}
}
}
TraceRecordManager::TraceRecordByteType TraceRecordManager::getByteType(duint address)
{
SHARED_ACQUIRE(LockTraceRecord);
duint base = address & ~((duint)4096 - 1);
auto pageInfoIterator = TraceRecord.find(ModHashFromAddr(base));
if(pageInfoIterator == TraceRecord.end())
return TraceRecordByteType::InstructionHeading;
else
{
TraceRecordPage pageInfo = pageInfoIterator->second;
duint offset = address - base;
switch(pageInfo.dataType)
{
case TraceRecordType::TraceRecordBitExec:
default:
return TraceRecordByteType::InstructionHeading;
case TraceRecordType::TraceRecordByteWithExecTypeAndCounter:
return (TraceRecordByteType)((((char*)pageInfo.rawPtr)[offset] & 0xC0) >> 6);
case TraceRecordType::TraceRecordWordWithExecTypeAndCounter:
return (TraceRecordByteType)((((short*)pageInfo.rawPtr)[offset] & 0xC000) >> 14);
}
}
}
void TraceRecordManager::increaseInstructionCounter()
{
InterlockedIncrement((volatile long*)&instructionCounter);
}
void TraceRecordManager::saveToDb(JSON root)
{
EXCLUSIVE_ACQUIRE(LockTraceRecord);
const JSON jsonTraceRecords = json_array();
const char* byteToHex = "0123456789ABCDEF";
for(auto i : TraceRecord)
{
JSON jsonObj = json_object();
if(i.second.moduleIndex != ~0)
{
json_object_set_new(jsonObj, "module", json_string(ModuleNames[i.second.moduleIndex].c_str()));
json_object_set_new(jsonObj, "rva", json_hex(i.second.rva));
}
else
{
json_object_set_new(jsonObj, "module", json_string(""));
json_object_set_new(jsonObj, "rva", json_hex(i.first));
}
json_object_set_new(jsonObj, "type", json_hex((duint)i.second.dataType));
auto ptr = (unsigned char*)i.second.rawPtr;
duint size = 0;
switch(i.second.dataType)
{
case TraceRecordType::TraceRecordBitExec:
size = 4096 / 8;
break;
case TraceRecordType::TraceRecordByteWithExecTypeAndCounter:
size = 4096;
break;
case TraceRecordType::TraceRecordWordWithExecTypeAndCounter:
size = 4096 * 2;
break;
default:
__debugbreak(); // We have encountered an error condition.
}
auto hex = StringUtils::ToCompressedHex(ptr, size);
json_object_set_new(jsonObj, "data", json_string(hex.c_str()));
json_array_append_new(jsonTraceRecords, jsonObj);
}
if(json_array_size(jsonTraceRecords))
json_object_set(root, "tracerecord", jsonTraceRecords);
// Notify garbage collector
json_decref(jsonTraceRecords);
}
void TraceRecordManager::loadFromDb(JSON root)
{
EXCLUSIVE_ACQUIRE(LockTraceRecord);
// get the root object
const JSON tracerecord = json_object_get(root, "tracerecord");
// return if nothing found
if(!tracerecord)
return;
size_t i;
JSON value;
json_array_foreach(tracerecord, i, value)
{
TraceRecordPage currentPage;
size_t size;
currentPage.dataType = (TraceRecordType)json_hex_value(json_object_get(value, "type"));
currentPage.rva = (duint)json_hex_value(json_object_get(value, "rva"));
switch(currentPage.dataType)
{
case TraceRecordType::TraceRecordBitExec:
size = 4096 / 8;
break;
case TraceRecordType::TraceRecordByteWithExecTypeAndCounter:
size = 4096;
break;
case TraceRecordType::TraceRecordWordWithExecTypeAndCounter:
size = 4096 * 2;
break;
default:
size = 0;
break;
}
if(size != 0)
{
currentPage.rawPtr = emalloc(size, "TraceRecordManager");
const char* p = json_string_value(json_object_get(value, "data"));
std::vector<unsigned char> data;
if(StringUtils::FromCompressedHex(p, data) && data.size() == size)
{
memcpy(currentPage.rawPtr, data.data(), size);
const char* moduleName = json_string_value(json_object_get(value, "module"));
duint key;
if(*moduleName)
{
currentPage.moduleIndex = getModuleIndex(std::string(moduleName));
key = currentPage.rva + ModHashFromName(moduleName);
}
else
{
currentPage.moduleIndex = ~0;
key = currentPage.rva;
}
TraceRecord.insert(std::make_pair(key, currentPage));
}
else
efree(currentPage.rawPtr, "TraceRecordManager");
}
}
}
unsigned int TraceRecordManager::getModuleIndex(const String & moduleName)
{
auto iterator = std::find(ModuleNames.begin(), ModuleNames.end(), moduleName);
if(iterator != ModuleNames.end())
return (unsigned int)(iterator - ModuleNames.begin());
else
{
ModuleNames.push_back(moduleName);
return (unsigned int)(ModuleNames.size() - 1);
}
}
void _dbg_dbgtraceexecute(duint CIP)
{
if(TraceRecord.getTraceRecordType(CIP) != TraceRecordManager::TraceRecordType::TraceRecordNone)
{
unsigned char buffer[MAX_DISASM_BUFFER];
if(MemRead(CIP, buffer, MAX_DISASM_BUFFER))
{
TraceRecord.increaseInstructionCounter();
Zydis instruction;
instruction.Disassemble(CIP, buffer, MAX_DISASM_BUFFER);
TraceRecord.TraceExecute(CIP, instruction.Size());
}
else
{
// if we reaches here, then the executable had executed an invalid address. Don't trace it.
}
}
else
TraceRecord.increaseInstructionCounter();
}
unsigned int _dbg_dbggetTraceRecordHitCount(duint address)
{
return TraceRecord.getHitCount(address);
}
TRACERECORDBYTETYPE _dbg_dbggetTraceRecordByteType(duint address)
{
return (TRACERECORDBYTETYPE)TraceRecord.getByteType(address);
}
bool _dbg_dbgsetTraceRecordType(duint pageAddress, TRACERECORDTYPE type)
{
return TraceRecord.setTraceRecordType(pageAddress, (TraceRecordManager::TraceRecordType)type);
}
TRACERECORDTYPE _dbg_dbggetTraceRecordType(duint pageAddress)
{
return (TRACERECORDTYPE)TraceRecord.getTraceRecordType(pageAddress);
}