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Update TamperMachine and disable write-to-code prevention (#2506)

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* Enable write to memory and improve logging

* Update tamper machine opcodes and improve reporting

* Add Else support

* Add missing private statement
This commit is contained in:
Caian Benedicto 2021-08-04 17:05:17 -03:00 committed by GitHub
parent a27986c311
commit ff8849671a
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GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 156 additions and 66 deletions
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9
Ryujinx.HLE/Exceptions/CodeRegionTamperedException.cs
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@ -1,9 +0,0 @@
using System;
namespace Ryujinx.HLE.Exceptions
{
public class CodeRegionTamperedException : TamperExecutionException
{
public CodeRegionTamperedException(string message) : base(message) { }
}
}

12
Ryujinx.HLE/HOS/Kernel/Process/ProcessTamperInfo.cs
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@ -8,13 +8,17 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
public IEnumerable<string> BuildIds { get; }
public IEnumerable<ulong> CodeAddresses { get; }
public ulong HeapAddress { get; }
public ulong AliasAddress { get; }
public ulong AslrAddress { get; }
public ProcessTamperInfo(KProcess process, IEnumerable<string> buildIds, IEnumerable<ulong> codeAddresses, ulong heapAddress)
public ProcessTamperInfo(KProcess process, IEnumerable<string> buildIds, IEnumerable<ulong> codeAddresses, ulong heapAddress, ulong aliasAddress, ulong aslrAddress)
{
Process = process;
BuildIds = buildIds;
Process = process;
BuildIds = buildIds;
CodeAddresses = codeAddresses;
HeapAddress = heapAddress;
HeapAddress = heapAddress;
AliasAddress = aliasAddress;
AslrAddress = aslrAddress;
}
}
}

2
Ryujinx.HLE/HOS/ModLoader.cs
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@ -658,7 +658,7 @@ namespace Ryujinx.HLE.HOS
Logger.Info?.Print(LogClass.ModLoader, $"Installing cheat '{cheat.Name}'");
tamperMachine.InstallAtmosphereCheat(cheat.Instructions, tamperInfo, exeAddress);
tamperMachine.InstallAtmosphereCheat(cheat.Name, cheat.Instructions, tamperInfo, exeAddress);
}
}

3
Ryujinx.HLE/HOS/ProgramLoader.cs
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@ -280,7 +280,8 @@ namespace Ryujinx.HLE.HOS
// Keep the build ids because the tamper machine uses them to know which process to associate a
// tamper to and also keep the starting address of each executable inside a process because some
// memory modifications are relative to this address.
tamperInfo = new ProcessTamperInfo(process, buildIds, nsoBase, process.MemoryManager.HeapRegionStart);
tamperInfo = new ProcessTamperInfo(process, buildIds, nsoBase, process.MemoryManager.HeapRegionStart,
process.MemoryManager.AliasRegionStart, process.MemoryManager.CodeRegionStart);
return true;
}

36
Ryujinx.HLE/HOS/Tamper/AtmosphereCompiler.cs
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@ -9,14 +9,36 @@ namespace Ryujinx.HLE.HOS.Tamper
{
class AtmosphereCompiler
{
public ITamperProgram Compile(IEnumerable<string> rawInstructions, ulong exeAddress, ulong heapAddress, ITamperedProcess process)
private ulong _exeAddress;
private ulong _heapAddress;
private ulong _aliasAddress;
private ulong _aslrAddress;
private ITamperedProcess _process;
public AtmosphereCompiler(ulong exeAddress, ulong heapAddress, ulong aliasAddress, ulong aslrAddress, ITamperedProcess process)
{
Logger.Debug?.Print(LogClass.TamperMachine, $"Executable address: {exeAddress:X16}");
Logger.Debug?.Print(LogClass.TamperMachine, $"Heap address: {heapAddress:X16}");
_exeAddress = exeAddress;
_heapAddress = heapAddress;
_aliasAddress = aliasAddress;
_aslrAddress = aslrAddress;
_process = process;
}
public ITamperProgram Compile(string name, IEnumerable<string> rawInstructions)
{
string[] addresses = new string[]
{
$" Executable address: 0x{_exeAddress:X16}",
$" Heap address : 0x{_heapAddress:X16}",
$" Alias address : 0x{_aliasAddress:X16}",
$" Aslr address : 0x{_aslrAddress:X16}"
};
Logger.Debug?.Print(LogClass.TamperMachine, $"Compiling Atmosphere cheat {name}...\n{string.Join('\n', addresses)}");
try
{
return CompileImpl(rawInstructions, exeAddress, heapAddress, process);
return CompileImpl(name, rawInstructions);
}
catch(TamperCompilationException exception)
{
@ -33,9 +55,9 @@ namespace Ryujinx.HLE.HOS.Tamper
return null;
}
private ITamperProgram CompileImpl(IEnumerable<string> rawInstructions, ulong exeAddress, ulong heapAddress, ITamperedProcess process)
private ITamperProgram CompileImpl(string name, IEnumerable<string> rawInstructions)
{
CompilationContext context = new CompilationContext(exeAddress, heapAddress, process);
CompilationContext context = new CompilationContext(_exeAddress, _heapAddress, _aliasAddress, _aslrAddress, _process);
context.BlockStack.Push(new OperationBlock(null));
// Parse the instructions.
@ -124,7 +146,7 @@ namespace Ryujinx.HLE.HOS.Tamper
throw new TamperCompilationException($"Reached end of compilation with unmatched conditional(s) or loop(s)");
}
return new AtmosphereProgram(process, context.PressedKeys, new Block(context.CurrentOperations));
return new AtmosphereProgram(name, _process, context.PressedKeys, new Block(context.CurrentOperations));
}
}
}

5
Ryujinx.HLE/HOS/Tamper/AtmosphereProgram.cs
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@ -8,10 +8,13 @@ namespace Ryujinx.HLE.HOS.Tamper
private Parameter<long> _pressedKeys;
private IOperation _entryPoint;
public string Name { get; }
public bool TampersCodeMemory { get; set; } = false;
public ITamperedProcess Process { get; }
public AtmosphereProgram(ITamperedProcess process, Parameter<long> pressedKeys, IOperation entryPoint)
public AtmosphereProgram(string name, ITamperedProcess process, Parameter<long> pressedKeys, IOperation entryPoint)
{
Name = name;
Process = process;
_pressedKeys = pressedKeys;
_entryPoint = entryPoint;

55
Ryujinx.HLE/HOS/Tamper/CodeEmitters/EndConditionalBlock.cs
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@ -10,32 +10,73 @@ namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
/// </summary>
class EndConditionalBlock
{
const int TerminationTypeIndex = 1;
private const byte End = 0; // True end of the conditional.
private const byte Else = 1; // End of the 'then' block and beginning of 'else' block.
public static void Emit(byte[] instruction, CompilationContext context)
{
// 20000000
Emit(instruction, context, null);
}
private static void Emit(byte[] instruction, CompilationContext context, IEnumerable<IOperation> operationsElse)
{
// 2X000000
// X: End type (0 = End, 1 = Else).
byte terminationType = instruction[TerminationTypeIndex];
switch (terminationType)
{
case End:
break;
case Else:
// Start a new operation block with the 'else' instruction to signal that there is the 'then' block just above it.
context.BlockStack.Push(new OperationBlock(instruction));
return;
default:
throw new TamperCompilationException($"Unknown conditional termination type {terminationType}");
}
// Use the conditional begin instruction stored in the stack.
instruction = context.CurrentBlock.BaseInstruction;
CodeType codeType = InstructionHelper.GetCodeType(instruction);
var upperInstruction = context.CurrentBlock.BaseInstruction;
CodeType codeType = InstructionHelper.GetCodeType(upperInstruction);
// Pop the current block of operations from the stack so control instructions
// for the conditional can be emitted in the upper block.
IEnumerable<IOperation> operations = context.CurrentOperations;
context.BlockStack.Pop();
// If the else operations are already set, then the upper block must not be another end.
if (operationsElse != null && codeType == CodeType.EndConditionalBlock)
{
throw new TamperCompilationException($"Expected an upper 'if' conditional instead of 'end conditional'");
}
ICondition condition;
switch (codeType)
{
case CodeType.BeginMemoryConditionalBlock:
condition = MemoryConditional.Emit(instruction, context);
condition = MemoryConditional.Emit(upperInstruction, context);
break;
case CodeType.BeginKeypressConditionalBlock:
condition = KeyPressConditional.Emit(instruction, context);
condition = KeyPressConditional.Emit(upperInstruction, context);
break;
case CodeType.BeginRegisterConditionalBlock:
condition = RegisterConditional.Emit(instruction, context);
condition = RegisterConditional.Emit(upperInstruction, context);
break;
case CodeType.EndConditionalBlock:
terminationType = upperInstruction[TerminationTypeIndex];
// If there is an end instruction above then it must be an else.
if (terminationType != Else)
{
throw new TamperCompilationException($"Expected an upper 'else' conditional instead of {terminationType}");
}
// Re-run the Emit with the else operations set.
Emit(instruction, context, operations);
return;
default:
throw new TamperCompilationException($"Conditional end does not match code type {codeType} in Atmosphere cheat");
}
@ -43,7 +84,7 @@ namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
// Create a conditional block with the current operations and nest it in the upper
// block of the stack.
IfBlock block = new IfBlock(condition, operations);
IfBlock block = new IfBlock(condition, operations, operationsElse);
context.CurrentOperations.Add(block);
}
}

20
Ryujinx.HLE/HOS/Tamper/CompilationContext.cs
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@ -20,17 +20,21 @@ namespace Ryujinx.HLE.HOS.Tamper
public Dictionary<byte, Register> StaticRegisters { get; }
public ulong ExeAddress { get; }
public ulong HeapAddress { get; }
public ulong AliasAddress { get; }
public ulong AslrAddress { get; }
public CompilationContext(ulong exeAddress, ulong heapAddress, ITamperedProcess process)
public CompilationContext(ulong exeAddress, ulong heapAddress, ulong aliasAddress, ulong aslrAddress, ITamperedProcess process)
{
Process = process;
PressedKeys = new Parameter<long>(0);
BlockStack = new Stack<OperationBlock>();
Registers = new Dictionary<byte, Register>();
SavedRegisters = new Dictionary<byte, Register>();
Process = process;
PressedKeys = new Parameter<long>(0);
BlockStack = new Stack<OperationBlock>();
Registers = new Dictionary<byte, Register>();
SavedRegisters = new Dictionary<byte, Register>();
StaticRegisters = new Dictionary<byte, Register>();
ExeAddress = exeAddress;
HeapAddress = heapAddress;
ExeAddress = exeAddress;
HeapAddress = heapAddress;
AliasAddress = aliasAddress;
AslrAddress = aslrAddress;
}
public Register GetRegister(byte index)

2
Ryujinx.HLE/HOS/Tamper/ITamperProgram.cs
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@ -4,6 +4,8 @@ namespace Ryujinx.HLE.HOS.Tamper
{
interface ITamperProgram
{
string Name { get; }
bool TampersCodeMemory { get; set; }
ITamperedProcess Process { get; }
void Execute(ControllerKeys pressedKeys);
}

3
Ryujinx.HLE/HOS/Tamper/ITamperedProcess.cs
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@ -5,6 +5,9 @@ namespace Ryujinx.HLE.HOS.Tamper
interface ITamperedProcess
{
ProcessState State { get; }
bool TamperedCodeMemory { get; set; }
T ReadMemory<T>(ulong va) where T : unmanaged;
void WriteMemory<T>(ulong va, T value) where T : unmanaged;
void PauseProcess();

6
Ryujinx.HLE/HOS/Tamper/MemoryHelper.cs
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@ -15,6 +15,12 @@ namespace Ryujinx.HLE.HOS.Tamper
case MemoryRegion.Heap:
// Memory address is relative to the heap.
return context.HeapAddress;
case MemoryRegion.Alias:
// Memory address is relative to the alias region.
return context.AliasAddress;
case MemoryRegion.Asrl:
// Memory address is relative to the asrl region, which matches the code region.
return context.AslrAddress;
default:
throw new TamperCompilationException($"Invalid memory source {source} in Atmosphere cheat");
}

12
Ryujinx.HLE/HOS/Tamper/MemoryRegion.cs
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@ -20,6 +20,16 @@ namespace Ryujinx.HLE.HOS.Tamper
/// <summary>
/// The address of the heap, as determined by the kernel.
/// </summary>
Heap = 0x1
Heap = 0x1,
/// <summary>
/// The address of the alias region, as determined by the kernel.
/// </summary>
Alias = 0x2,
/// <summary>
/// The address of the code region with address space layout randomization included.
/// </summary>
Asrl = 0x3,
}
}

19
Ryujinx.HLE/HOS/Tamper/Operations/IfBlock.cs
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@ -6,27 +6,26 @@ namespace Ryujinx.HLE.HOS.Tamper.Operations
class IfBlock : IOperation
{
private ICondition _condition;
private IEnumerable<IOperation> _operations;
private IEnumerable<IOperation> _operationsThen;
private IEnumerable<IOperation> _operationsElse;
public IfBlock(ICondition condition, IEnumerable<IOperation> operations)
public IfBlock(ICondition condition, IEnumerable<IOperation> operationsThen, IEnumerable<IOperation> operationsElse)
{
_condition = condition;
_operations = operations;
}
public IfBlock(ICondition condition, params IOperation[] operations)
{
_operations = operations;
_operationsThen = operationsThen;
_operationsElse = operationsElse;
}
public void Execute()
{
if (!_condition.Evaluate())
IEnumerable<IOperation> operations = _condition.Evaluate() ? _operationsThen : _operationsElse;
if (operations == null)
{
return;
}
foreach (IOperation op in _operations)
foreach (IOperation op in operations)
{
op.Execute();
}

12
Ryujinx.HLE/HOS/Tamper/TamperedKProcess.cs
View File

@ -11,9 +11,11 @@ namespace Ryujinx.HLE.HOS.Tamper
public ProcessState State => _process.State;
public bool TamperedCodeMemory { get; set; } = false;
public TamperedKProcess(KProcess process)
{
this._process = process;
_process = process;
}
private void AssertMemoryRegion<T>(ulong va, bool isWrite) where T : unmanaged
@ -32,11 +34,11 @@ namespace Ryujinx.HLE.HOS.Tamper
return;
}
// TODO (Caian): It is unknown how PPTC behaves if the tamper modifies memory regions
// belonging to code. So for now just prevent code tampering.
if ((va >= _process.MemoryManager.CodeRegionStart) && (va + size <= _process.MemoryManager.CodeRegionEnd))
// TODO (Caian): The JIT does not support invalidating a code region so writing to code memory may not work
// as intended, so taint the operation to issue a warning later.
if (isWrite && (va >= _process.MemoryManager.CodeRegionStart) && (va + size <= _process.MemoryManager.CodeRegionEnd))
{
throw new CodeRegionTamperedException($"Writing {size} bytes to address 0x{va:X16} alters code");
TamperedCodeMemory = true;
}
}

26
Ryujinx.HLE/HOS/TamperMachine.cs
View File

@ -31,7 +31,7 @@ namespace Ryujinx.HLE.HOS
}
}
internal void InstallAtmosphereCheat(IEnumerable<string> rawInstructions, ProcessTamperInfo info, ulong exeAddress)
internal void InstallAtmosphereCheat(string name, IEnumerable<string> rawInstructions, ProcessTamperInfo info, ulong exeAddress)
{
if (!CanInstallOnPid(info.Process.Pid))
{
@ -39,11 +39,13 @@ namespace Ryujinx.HLE.HOS
}
ITamperedProcess tamperedProcess = new TamperedKProcess(info.Process);
AtmosphereCompiler compiler = new AtmosphereCompiler();
ITamperProgram program = compiler.Compile(rawInstructions, exeAddress, info.HeapAddress, tamperedProcess);
AtmosphereCompiler compiler = new AtmosphereCompiler(exeAddress, info.HeapAddress, info.AliasAddress, info.AslrAddress, tamperedProcess);
ITamperProgram program = compiler.Compile(name, rawInstructions);
if (program != null)
{
program.TampersCodeMemory = false;
_programs.Enqueue(program);
}
@ -116,27 +118,27 @@ namespace Ryujinx.HLE.HOS
// Re-enqueue the tampering program because the process is still valid.
_programs.Enqueue(program);
Logger.Debug?.Print(LogClass.TamperMachine, "Running tampering program");
Logger.Debug?.Print(LogClass.TamperMachine, $"Running tampering program {program.Name}");
try
{
ControllerKeys pressedKeys = (ControllerKeys)Thread.VolatileRead(ref _pressedKeys);
program.Process.TamperedCodeMemory = false;
program.Execute(pressedKeys);
}
catch (CodeRegionTamperedException ex)
{
Logger.Debug?.Print(LogClass.TamperMachine, $"Prevented tampering program from modifing code memory");
if (!String.IsNullOrEmpty(ex.Message))
// Detect the first attempt to tamper memory and log it.
if (!program.TampersCodeMemory && program.Process.TamperedCodeMemory)
{
Logger.Debug?.Print(LogClass.TamperMachine, ex.Message);
program.TampersCodeMemory = true;
Logger.Warning?.Print(LogClass.TamperMachine, $"Tampering program {program.Name} modifies code memory so it may not work properly");
}
}
catch (Exception ex)
{
Logger.Debug?.Print(LogClass.TamperMachine, $"The tampering program crashed, this can happen while the game is starting");
Logger.Debug?.Print(LogClass.TamperMachine, $"The tampering program {program.Name} crashed, this can happen while the game is starting");
if (!String.IsNullOrEmpty(ex.Message))
if (!string.IsNullOrEmpty(ex.Message))
{
Logger.Debug?.Print(LogClass.TamperMachine, ex.Message);
}