Ryujinx/Ryujinx.HLE/HOS/Tamper/TamperedKProcess.cs
Caian Benedicto ff8849671a
Update TamperMachine and disable write-to-code prevention (#2506)
* Enable write to memory and improve logging

* Update tamper machine opcodes and improve reporting

* Add Else support

* Add missing private statement
2021-08-04 22:05:17 +02:00

68 lines
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2.2 KiB
C#

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 bool TamperedCodeMemory { get; set; } = false;
public TamperedKProcess(KProcess process)
{
_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): 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))
{
TamperedCodeMemory = true;
}
}
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!");
}
}
}