add linux support

looks like Microsoft fixed `hostfxr_initialize_for_runtime_config`

Author: StackOverflowExcept1on

.github/workflows/ci.yml

@@ -5,7 +5,23 @@ on:
   workflow_dispatch:
 
 jobs:
-  build:
+  linux-build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Build project
+        run: ./_build.sh
+
+      - name: Run project
+        run: ./_run.sh
+
+  windows-build:
     runs-on: windows-latest
 
     steps:

Bootstrapper/build.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -ex
+
+mkdir -p build && cd build
+
+cmake ..
+cmake --build . --config Release

DemoApplication/build.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+set -ex
+dotnet publish -c Release -r linux-x64 -p:PublishDir="$(pwd)/dist" --self-contained

README.md

@@ -15,28 +15,26 @@ CLI tool that can replace C# methods in .NET Core applications
 - Node.js: https://nodejs.org/en/download/
 - frida: https://frida.re
 
-### Installation on Windows
+### Installation
 
 Open command line and run this script
 
+- `_build.sh` on Linux
+- `_build.bat` on Windows
+
 It will build
 
 - Node.js package [net-core-injector](package.json) - DLL-injector written in TypeScript
 - [Bootstrapper](Bootstrapper) - helper native library written in C++ to interact with .NET Core runtime
 - [DemoApplication](DemoApplication) - test application to demonstrate how it works
 - [RuntimePatcher](RuntimePatcher) - code that attaches to [DemoApplication](DemoApplication)
 
-```
-_build.bat
-```
-
 ### Running
 
 This script should produce output like the GIF above
 
-```
-_run.bat
-```
+- `_run.sh` on Linux
+- `_run.bat` on Windows
 
 ### Internal documentation
 
@@ -50,8 +48,8 @@ I did it in [`Bootstrapper/src/library.cpp`](Bootstrapper/src/library.cpp).
 
 [`net-core-injector/src/main.ts`](src/main.ts) injects `Bootstrapper.dll` into C# process and loads custom assembly
 
-
 The following command runs `DemoApplication.exe` on another thread and injects code.
+
 ```
 start DemoApplication\dist\DemoApplication.exe
 
@@ -64,6 +62,7 @@ RuntimePatcher\dist\RuntimePatcher.dll ^
 ```
 
 Then the execution happens in this order:
+
 1. get into `DemoApplication.exe` process memory via DLL-injection of `Bootstrapper.dll`
 2. call native C++ code
    ```cpp
@@ -86,4 +85,4 @@ You can use this to mod games written in C# or to patch any software
 
 ### TODO
 
-- Linux support is incomplete due to some issues with the secondary host context in `hostfxr`
+- I don't have macOS device so it's supported for now. External contributors are welcome.

RuntimePatcher/build.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+set -ex
+dotnet publish -c Release -p:PublishDir="$(pwd)/dist"

_build.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -ex
+
+npm install
+
+cd Bootstrapper
+./build.sh
+cd ..
+
+cd DemoApplication
+./build.sh
+cd ..
+
+cd RuntimePatcher
+./build.sh
+cd ..

_run.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -ex
+
+sudo sysctl kernel.yama.ptrace_scope=0
+./DemoApplication/dist/DemoApplication &
+npm start -- inject \
+DemoApplication \
+Bootstrapper/build/libBootstrapper.so \
+RuntimePatcher/dist/RuntimePatcher.runtimeconfig.json \
+RuntimePatcher/dist/RuntimePatcher.dll \
+"RuntimePatcher.Main, RuntimePatcher" "InitializePatches"