R/Ryujinx.HLE/HOS/Tamper/TamperedKProcess.cs

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using Ryujinx.Common.Logging;
using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Kernel.Process;
using System.Runtime.CompilerServices;
namespace Ryujinx.HLE.HOS.Tamper
{
class TamperedKProcess : ITamperedProcess
{
private KProcess _process;
public ProcessState State => _process.State;
public TamperedKProcess(KProcess process)
{
this._process = process;
}
private void AssertMemoryRegion<T>(ulong va, bool isWrite) where T : unmanaged
{
ulong size = (ulong)Unsafe.SizeOf<T>();
// TODO (Caian): This double check is workaround because CpuMemory.IsRangeMapped reports
// some addresses as mapped even though they are not, i. e. 4 bytes from 0xffffffffffffff70.
if (!_process.CpuMemory.IsMapped(va) || !_process.CpuMemory.IsRangeMapped(va, size))
{
throw new TamperExecutionException($"Unmapped memory access of {size} bytes at 0x{va:X16}");
}
if (!isWrite)
{
return;
}
// TODO (Caian): It is unknown how PPTC behaves if the tamper modifies memory regions
// belonging to code. So for now just prevent code tampering.
if ((va >= _process.MemoryManager.CodeRegionStart) && (va + size <= _process.MemoryManager.CodeRegionEnd))
{
throw new CodeRegionTamperedException($"Writing {size} bytes to address 0x{va:X16} alters code");
}
}
public T ReadMemory<T>(ulong va) where T : unmanaged
{
AssertMemoryRegion<T>(va, false);
return _process.CpuMemory.Read<T>(va);
}
public void WriteMemory<T>(ulong va, T value) where T : unmanaged
{
AssertMemoryRegion<T>(va, true);
_process.CpuMemory.Write(va, value);
}
public void PauseProcess()
{
Logger.Warning?.Print(LogClass.TamperMachine, "Process pausing is not supported!");
}
public void ResumeProcess()
{
Logger.Warning?.Print(LogClass.TamperMachine, "Process resuming is not supported!");
}
}
}