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TitanEngine
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Put a critical section around StepInto to make it thread-safe

This commit is contained in:
Duncan Ogilvie 2021-12-11 23:43:22 +01:00
parent 1a76d61ef6
commit fb1babcbb3
5 changed files with 63 additions and 79 deletions
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1
TitanEngine/Global.Debugger.cpp
View File

@ -40,6 +40,7 @@ LPVOID engineAttachedProcessDebugInfo = NULL;
wchar_t szDebuggerName[512];
bool DebugStepFinal = false;
LPVOID StepOutCallBack = NULL;
CRITICAL_SECTION engineStepActiveCr;
// Global.Debugger.functions:
long DebugLoopInSecondThread(LPVOID InputParameter)

2
TitanEngine/Global.Debugger.h
View File

@ -2,6 +2,7 @@
#define _GLOBAL_DEBUGGER_H
#include <vector>
#include <Windows.h>
extern HARDWARE_DATA DebugRegister[4];
extern PROCESS_INFORMATION dbgProcessInformation;
@ -39,6 +40,7 @@ extern LPVOID engineAttachedProcessDebugInfo;
extern wchar_t szDebuggerName[512];
extern bool DebugStepFinal;
extern LPVOID StepOutCallBack;
extern CRITICAL_SECTION engineStepActiveCr;
long DebugLoopInSecondThread(LPVOID InputParameter);
void DebuggerReset();

9
TitanEngine/TitanEngine.Debugger.Control.cpp
View File

@ -37,13 +37,16 @@ __declspec(dllexport) void TITCALL ForceClose()
__declspec(dllexport) void TITCALL StepInto(LPVOID StepCallBack)
{
EnterCriticalSection(&engineStepActiveCr);
if (!engineStepActive)
{
ULONG_PTR ueCurrentPosition = GetContextData(UE_CIP);
unsigned char instr[16];
MemoryReadSafe(dbgProcessInformation.hProcess, (void*)ueCurrentPosition, instr, sizeof(instr), 0);
char* DisassembledString = (char*)StaticDisassembleEx(ueCurrentPosition, (LPVOID)instr);
if(strstr(DisassembledString, "PUSHF"))
if (strstr(DisassembledString, "PUSHF"))
StepOver(StepCallBack);
else if(strstr(DisassembledString, "POP SS") || strstr(DisassembledString, "MOV SS")) //prevent the 'PUSH SS', 'POP SS' step trick
else if (strstr(DisassembledString, "POP SS") || strstr(DisassembledString, "MOV SS")) //prevent the 'PUSH SS', 'POP SS' step trick
{
ueCurrentPosition += StaticLengthDisassemble((void*)instr);
SetBPX(ueCurrentPosition, UE_BREAKPOINT_TYPE_INT3 + UE_SINGLESHOOT, StepCallBack);
@ -61,6 +64,8 @@ __declspec(dllexport) void TITCALL StepInto(LPVOID StepCallBack)
engineStepCallBack = StepCallBack;
engineStepCount = 0;
}
}
LeaveCriticalSection(&engineStepActiveCr);
}
__declspec(dllexport) void TITCALL StepOver(LPVOID StepCallBack)

88
TitanEngine/TitanEngine.Debugger.DebugLoop.cpp
View File

@ -12,6 +12,33 @@
#define UE_MODULEx86 0x2000;
#define UE_MODULEx64 0x2000;
static void engineStep()
{
EnterCriticalSection(&engineStepActiveCr);
if (engineStepActive)
{
DBGCode = DBG_CONTINUE;
if (engineStepCount == 0)
{
typedef void(TITCALL* fCustomBreakPoint)(void);
auto cbStep = fCustomBreakPoint(engineStepCallBack);
engineStepActive = false;
engineStepCallBack = NULL;
LeaveCriticalSection(&engineStepActiveCr);
cbStep();
}
else
{
SingleStep(engineStepCount, engineStepCallBack);
LeaveCriticalSection(&engineStepActiveCr);
}
}
else
{
LeaveCriticalSection(&engineStepActiveCr);
}
}
__declspec(dllexport) void TITCALL DebugLoop()
{
bool FirstBPX = true;
@ -642,20 +669,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
EnableBPX(ResetBPXAddressTo);
ResetBPXAddressTo = NULL;
ResetBPX = false;
if(engineStepActive)
{
if(engineStepCount == 0)
{
myCustomBreakPoint = (fCustomBreakPoint)(engineStepCallBack);
engineStepActive = false;
engineStepCallBack = NULL;
myCustomBreakPoint();
}
else
{
SingleStep(engineStepCount, engineStepCallBack);
}
}
engineStep();
}
else
{
@ -671,20 +685,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
{
ResetHwBPX = false;
SetHardwareBreakPoint(DebugRegisterX.DrxBreakAddress, DebugRegisterXId, DebugRegisterX.DrxBreakPointType, DebugRegisterX.DrxBreakPointSize, (LPVOID)DebugRegisterX.DrxCallBack);
if(engineStepActive)
{
if(engineStepCount == 0)
{
myCustomBreakPoint = (fCustomBreakPoint)(engineStepCallBack);
engineStepActive = false;
engineStepCallBack = NULL;
myCustomBreakPoint();
}
else
{
SingleStep(engineStepCount, engineStepCallBack);
}
}
engineStep();
}
if(ResetMemBPX) //restore memory breakpoint
{
@ -719,20 +720,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
VirtualProtectEx(dbgProcessInformation.hProcess, (LPVOID)ResetMemBPXAddress, ResetMemBPXSize, NewProtect, &OldProtect);
}
if(engineStepActive)
{
if(engineStepCount == 0)
{
myCustomBreakPoint = (fCustomBreakPoint)(engineStepCallBack);
engineStepActive = false;
engineStepCallBack = NULL;
myCustomBreakPoint();
}
else
{
SingleStep(engineStepCount, engineStepCallBack);
}
}
engineStep();
}
}
else //no resetting needed (debugger reached hardware breakpoint or the user stepped)
@ -867,21 +855,7 @@ __declspec(dllexport) void TITCALL DebugLoop()
if(strstr(DisassembledString, "PUSHF"))
PushfBPX = true;
}
if(engineStepActive)
{
DBGCode = DBG_CONTINUE;
if(engineStepCount == 0)
{
myCustomBreakPoint = (fCustomBreakPoint)(engineStepCallBack);
engineStepActive = false;
engineStepCallBack = NULL;
myCustomBreakPoint();
}
else
{
SingleStep(engineStepCount, engineStepCallBack);
}
}
engineStep();
}
if(DBGCode == DBG_EXCEPTION_NOT_HANDLED) //NOTE: only call the chSingleStep callback when the debuggee generated the exception
{

2
TitanEngine/TitanEngine.cpp
View File

@ -5,6 +5,7 @@
#include "Global.Injector.h"
#include "Global.Engine.Extension.h"
#include "Global.Engine.Threading.h"
#include "Global.Debugger.h"
// Global.Engine.Entry:
BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
@ -13,6 +14,7 @@ BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
case DLL_PROCESS_ATTACH:
engineHandle = hinstDLL;
InitializeCriticalSection(&engineStepActiveCr);
EngineInit();
EmptyGarbage();
for(int i = 0; i < UE_MAX_RESERVED_MEMORY_LEFT; i++)