使用dnlib启用不安全的代码 [英] Enable unsafe code with dnlib

问题描述

你好！我正在使用C＃和dnlib编写一个混淆器。在某些时候，我需要在可执行文件中注入不安全的代码，但如果你没有声明它，这应该最终导致应用程序崩溃。有没有办法声明（有或没有dnlib）所选模块将包含不安全的代码？

谢谢!!



我尝试过：



试图找到如何使用dnlib声明模块将包含不安全的代码。我在文档中找不到任何内容。

解决方案

我不能代表dnlib，但标准编译器标记了不安全的模块 [System.Security.UnverifiableCodeAttribute（）]



最简单的检测就像

 private void SafeOrUnsafe（程序集asm）{
 foreach（模块m in asm.GetModules（true））{
 Debug.Print（{0} Unsafe：{1}，m.Name，m.IsDefined（typeof（ System.Security.UnverifiableCodeAttribute），true））; 
} 
} 

Alan。

经过多次挖掘，我发现你可以标记使用以下代码的dnlib模块不安全：

 ModuleDefMD module = ModuleDefMD.Load（ < span class =code-string> theModuleYouWantToMarkAsUnsafe.exe）; 
 
 module.CustomAttributes.Add（ new  CustomAttribute（ new  MemberRefUser（module，  。ctor，MethodSig.CreateInstance（module.CorLibTypes.Void），module.CorLibTypes.GetTypeRef（   System.Security， < span class =code-string> UnverifiableCodeAttribute））））; 

我非常感谢@Alan指出工作需要什么属性！

Hello ! I am coding an obfuscator using C# and dnlib. At some point i need to inject unsafe code in the executable but this should end up in an app crash, if you don't "declare" it . Is there a way to declare(with or without dnlib) that a selected module will contain unsafe code ?
Thanks!!

What I have tried:

Tried to find how to declare that a module will contain unsafe code using dnlib. I couldn't find anything in the docs.

解决方案

I can't speak for dnlib but the standard compiler marks unsafe modules with the [System.Security.UnverifiableCodeAttribute()]

The simplest detection would be something like

private void SafeOrUnsafe(Assembly asm) {
  foreach (Module m in asm.GetModules(true)) {
    Debug.Print("{0} Unsafe : {1}", m.Name, m.IsDefined(typeof(System.Security.UnverifiableCodeAttribute), true));
  }
}

Alan.

After some more digging, i found out that you can mark a module as unsafe with dnlib with the following code:

ModuleDefMD module = ModuleDefMD.Load("theModuleYouWantToMarkAsUnsafe.exe");

module.CustomAttributes.Add(new CustomAttribute(new MemberRefUser(module, ".ctor", MethodSig.CreateInstance(module.CorLibTypes.Void), module.CorLibTypes.GetTypeRef("System.Security", "UnverifiableCodeAttribute"))));

I thank very much @Alan for pointing out what attribute is needed for the job !

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