R6DumpCleaner

Purpose

In the latest Update, Rainbow Six Siege includes lot of junk code that looks like this:

v483 = (char *)&v688 - (char *)&v689;
if ( (char *)&v688 - (char *)&v689 < 0 )
    v483 = (char *)&v689 - (char *)&v688;

This code essentially computes:

v483 = 8; // Because v689 and v688 are just 8 Bytes apart on the stack

This tool will scan for such patterns and remove the nonsense

Usage

Run the tool from the command line using:

R6DumpCleaner.exe <DumpFile> [OutputFile]

• <DumpFile>: Required. The input file to be cleaned.
• [OutputFile]: Optional. The output file name. If not provided, the tool will create a file named <DumpFile>_patched in the same directory.

Building

This project depends on Zydis. You can either include Zydis in the project directory or install it via vcpkg:

vcpkg install zydis

Then, build the project using your preferred build system.

How it works

The tool searches for the following instruction sequence in the .text section:

mov A, [rsp+var1]
sub A, [rsp+var2]
mov B, A
neg B
cmovs B, A

It then converts this sequence to a single instruction:

mov B, abs(var1 - var2)

The rest of the old bytes are filled with NOPs (0x90)