Guide [Source] General Programming — Corsair Ring0 I/O Port Read/Write via Signed Driver (C++)

[byte_corvus]

Been messing around with some memory access vectors lately and realized I have this Corsair stuff sitting in my local repo. It is a solid method for getting Ring 0 I/O port read/write access without needing to touch unsigned drivers or bypass PatchGuard manually.

The core of this is the CorsairLLAccess64.sys driver. Because it is signed by Corsair, you can load their legitimate library (CorsairLLAccessLib64.dll) directly into your process. From there, you just call CrGetLLAccessInterface to grab the table. It basically gives you the keys to the kingdom for I/O port manipulation from user mode.

Tech breakdown:

1. Leverages a legit, signed driver to avoid flag-happy anti-cheats that scan for unsigned kernel modules.
2. No need for custom mapping or complex driver loaders.
3. Grants direct R/W access to I/O ports, which is useful for custom hardware comms or specific memory-mapped I/O operations.

I have not personally pushed this through a heavy-hitting kernel AC like Vanguard or Ricochet, so use your head. If you are going to use this for a internal or external project, keep your communication patterns clean. Just because the driver is signed does not mean the way you use it won't get flagged if your I/O patterns look like a bot.

Source and Implementation:
You can find the breakdown and the actual logic on my Github under /Syscallh00k/Corsair-Ring-0-I-O-Ports.

Spoiler: Download Link

// GITHUB: /Syscallh00k/Corsair-Ring-0-I-O-Ports
// BUILD:

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// VT:

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Anyone actually tested this against a modern kernel-level driver? I am curious if anyone has found a way to use this for DMA-adjacent hardware emulation or if you are sticking to standard RPM/WPM hooks. Drop your findings below if you manage to implement it into a clean external base.