97 lines
6.9 KiB
Markdown
97 lines
6.9 KiB
Markdown
# wufuc [](https://ci.appveyor.com/project/zeffy/wufuc) [](https://isitmaintained.com/project/zeffy/wufuc)
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**English** | [русский](../../wiki/README-(русский)) | [Français](../../wiki/README-(Français)) | [Deutsch](../../wiki/README-(Deutsch)) | [Magyar](../../wiki/README-(Magyar)) | [Português Brasileiro](../../wiki/README-(Português-Brasileiro)) | [Italiano](../../wiki/README-(Italiano))
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Disables the "Unsupported Hardware" message in Windows Update, and allows you to continue installing updates on Windows 7 and 8.1 systems with Intel Kaby Lake, AMD Ryzen, or other unsupported processors.
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## Downloads [](../../releases)
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- [**Click here for the latest stable version**](../../releases/latest)
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- [~~Unstable builds~~](https://ci.appveyor.com/project/zeffy/wufuc) **Broken until AppVeyor adds WDK support for Visual Studio 2017 ([appveyor/ci#1554](https://github.com/appveyor/ci/issues/1554))**
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## Preface
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The changelog for Windows updates KB4012218 and KB4012219 included the following:
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> Enabled detection of processor generation and hardware support when PC tries to scan or download updates through Windows Update.
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These updates marked the implementation of a [policy change](https://blogs.windows.com/windowsexperience/2016/01/15/windows-10-embracing-silicon-innovation/) they announced some time ago, where Microsoft stated that they would not be supporting Windows 7 or 8.1 on next-gen Intel, AMD and Qualcomm processors.
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This was essentially a big middle finger to anyone who decides to not "upgrade" to the steaming pile of :shit: known as Windows 10, especially considering the extended support periods for Windows 7 and 8.1 won't be ending until January 4, 2020 and January 10, 2023 respectively.
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## Some people with older Intel and AMD processors are also affected!
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I've received user reports of the following CPUs all being blocked from receiving updates:
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- [Intel Atom Z530](../../issues/7)
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- [Intel Atom D525](../../issues/34)
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- [Intel Core i5-M 560](../../issues/23)
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- [Intel Core i5-4300M](../../issues/24)
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- [Intel Pentium B940](../../issues/63)
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- [AMD FX-8350](../../issues/32)
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- [AMD Turion 64 Mobile Technology ML-34](../../issues/80)
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## Bad Microsoft!
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If you are interested, you can read my original write up on discovering the CPU check [here](../../tree/old-kb4012218-19).
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## Features
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- Enables Windows Update on PCs with unsupported processors.
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- Written in C, the best programming language. :sunglasses:
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- Completely free (as in freedom) software.
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- Does not modify any system files.
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- Byte pattern-based patching, which means it will usually keep working even after new updates come out.
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- Absolutely zero dependencies.
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## How it works
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Basically, inside a system file called `wuaueng.dll` there are two functions responsible for the CPU check: `IsDeviceServiceable(void)` and `IsCPUSupported(void)`.
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`IsDeviceServiceable` simply calls `IsCPUSupported` once, and then re-uses the result that it receives on subsequent calls.
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My patch takes advantage of this behavior by patching a couple of boolean values and basically making Windows Update think that it has already checked your processor, and the result was that it is indeed supported.
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- The installer registers wufuc as a custom Application Verifier provider.
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- When a `svchost.exe` process starts, the Windows PE loader automatically loads wufuc into its virtual address space.
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- After that, wufuc will then check the command line of the process it was loaded into, then install some API hooks when appropriate:
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* `LoadLibraryExW` hook will automatically patch `wuaueng.dll` as soon as it is loaded.
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* `RegQueryValueExW` hook is necessary to provide compatibility with attempts by other third-parties at bypassing the CPU check. (see issue [#100](../../issues/100))
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- If wufuc gets loaded by a `svchost.exe` process that isn't related to Windows Update, it goes into a dormant state and no hooks are applied.
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## How to use unattended feature in the batch setup scripts
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`install_wufuc.bat` and `uninstall_wufuc.bat` both support two command line parameters that can used alone or be combined to change the behavior of the scripts:
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- `/NORESTART` - Automatically declines rebooting after the setup finishes.
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- `/UNATTENDED` - Skips all prompts for user interaction, and automatically restarts unless `/NORESTART` is also specified.
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These must be used from an elevated command line prompt.
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## What to do if you get stuck on a black screen with just a cursor after the Windows boot animation
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This will happen if wufuc somehow manages to crash the `svchost.exe` process that is responsible for displaying the login screen.
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Normally this should **never ever** happen, because wufuc goes dormant in `svchost.exe` processes that are unrelated to Windows Update.
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I have only encountered this during development with very unstable code, or by causing it intentionally.
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However, just in case this does happen to someone, here is how to fix it:
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1. [Boot into Safe Mode with Command Prompt](https://support.microsoft.com/en-us/help/17419/windows-7-advanced-startup-options-safe-mode).
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2. In the command prompt type `regedit` and press enter.
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3. Navigate to the key `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options`
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4. Expand the `Image File Execution Options` tree.
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5. Locate the `svchost.exe` sub key, right-click it and press **Delete**.
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6. Reboot.
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7. You should be able to log in normally again.
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8. **If this happens to you, please report it in the issues tab so I can try to figure out what is causing the crash!**
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## Sponsors
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### [Advanced Installer](http://www.advancedinstaller.com/)
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The installer packages are created with Advanced Installer using an [open source license](http://www.advancedinstaller.com/free-license.html). Advanced Installer's intuitive and friendly user interface allowed me to quickly create a feature complete installer with minimal effort. [Check it out!](http://www.advancedinstaller.com/)
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## Special thanks
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- Alex Ionescu ([@ionescu007](https://github.com/ionescu007)) for his [_"Hooking Nirvana"_ presentation at REcon 2015](https://www.youtube.com/watch?v=bqU0y4FzvT0) and its corresponding [repository of example code](https://github.com/ionescu007/HookingNirvana).
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- Wen Jia Liu ([@wj32](https://github.com/wj32)) for his awesome program [Process Hacker](https://github.com/processhacker2/processhacker) which has been absolutely instrumental in the development of wufuc, and also for his [`phnt`](https://github.com/processhacker2/processhacker/tree/master/phnt) headers.
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- Duncan Ogilvie ([@mrexodia](https://github.com/mrexodia)) for his [`patternfind.cpp`](https://github.com/x64dbg/x64dbg/blob/development/src/dbg/patternfind.cpp) algorithm from [x64dbg](https://github.com/x64dbg/x64dbg).
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