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Usermode busy waiting for performance gains #56

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18 changes: 16 additions & 2 deletions src/rop_thread/rop_thread.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -128,12 +128,23 @@ void RopThreadManager::SendTargetProcessPid(const int TargetPid)

void RopThreadManager::SendReadRequest(const std::uint64_t SourceAddress, const std::uint64_t DestAddress, const std::size_t Size)
{
// spin on dest directly - MmCopyVirtualMemory overwrites this
// before the kernel signals KmEvent
*reinterpret_cast<volatile std::uint64_t*>(DestAddress) = 0xC0FEBABEC0FEBABE;

SharedMemory->WriteSrcEProcess = SharedMemory->GameEProcess;
SharedMemory->WriteDstEProcess = SharedMemory->CheatEProcess;
SharedMemory->WriteSrcAddress = SourceAddress;
SharedMemory->WriteDstAddress = DestAddress;
SharedMemory->WriteSize = Size;
SendPacket();

SetEvent(UmEvent);

volatile std::uint64_t* Dest = reinterpret_cast<volatile std::uint64_t*>(DestAddress);
while (*Dest == 0xC0FEBABEC0FEBABE) {}

// drain the event so it doesn't leak into the next operation
WaitForSingleObject(KmEvent, INFINITE);
}

void RopThreadManager::SendWriteRequest(const std::uint64_t SourceAddress, const std::uint64_t DestAddress, const std::size_t Size)
Expand All @@ -143,5 +154,8 @@ void RopThreadManager::SendWriteRequest(const std::uint64_t SourceAddress, const
SharedMemory->WriteSrcAddress = SourceAddress;
SharedMemory->WriteDstAddress = DestAddress;
SharedMemory->WriteSize = Size;
SendPacket();

SetEvent(UmEvent);

while (WaitForSingleObject(KmEvent, 0) != WAIT_OBJECT_0) {}
}