R2R Linux PE file Invalid section RVA

[FickoDeLux]

dnSpyEx version

6.4.1

Describe the Bug

DnSpyEx loads the mixed linux module (R2R crossgened) just fine.
But by saving (without any modification) generates exception:

dnlib.DotNet.Writer.ModuleWriterException: Invalid section RVA
at dnlib.DotNet.Writer.NativeModuleWriter.WriteFile()
at dnlib.DotNet.Writer.NativeModuleWriter.Write()
at dnlib.DotNet.Writer.NativeModuleWriter.WriteImpl()
at dnlib.DotNet.Writer.ModuleWriterBase.Write(Stream dest)
at dnlib.DotNet.Writer.ModuleWriterBase.Write(String fileName)
at dnlib.DotNet.ModuleDefMD.NativeWrite(String filename, NativeModuleWriterOptions options)
at dnSpy.AsmEditor.SaveModule.ModuleSaver.Save(SaveModuleOptionsVM vm) in C:\Users\admin\Desktop\dnSpy-hotfix\dnSpy\Extensions\dnSpy.AsmEditor\SaveModule\ModuleSaver.cs:line 187
at dnSpy.AsmEditor.SaveModule.ModuleSaver.SaveAll() in C:\Users\admin\Desktop\dnSpy-hotfix\dnSpy\Extensions\dnSpy.AsmEditor\SaveModule\ModuleSaver.cs:line 151
at dnSpy.AsmEditor.SaveModule.SaveMultiModuleVM.SaveAsync(SaveOptionsVM[] mods) in C:\Users\admin\Desktop\dnSpy-hotfix\dnSpy\Extensions\dnSpy.AsmEditor\SaveModule\SaveMultiModuleVM.cs:line 250

How To Reproduce

1.) Load dll
2.) Save module

Expected Behavior

Saves the module

Actual Behavior

Saving 0 bytes

Additional Context

DnSpyEx handels crossgened windows dll just fine.

Steps needed to overcome the linux burden:

1. Use "crossgen2.exe --compile-no-methods --targetos:windows" to strip native code and convert it to windows PE.
   2.) Load dll into DnSpyEx (It still handels it as a mixed module maybe oneother bug?)
   3.) Modify dll as needed (or not)
   4.) Save module (because it is a windows PE now DnSpyEx able to save it.)
   5.) Use "crossgen2.exe --compile-no-methods --targetos:linux" to convert it back to linux PE

[ElektroKill]

Hi, could you provide a .exe/.dll file using which I can reproduce the issue easily? It would make diagnosing and fixing this bug much easier :p. If you would rather send it to me directly rather than upload it to GitHub, please email me elektrokilldev@protonmail.com

Thanks in advance!

[ElektroKill]

Hi, this issue is not caused by dnSpy. It occurs in dnlib which is the metadata reading and writing library dnSpy uses. Please report the issue over at https://github.com/0xd4d/dnlib. The code required to reproduce it using dnlib is the following:

var mod = ModuleDefMD.Load("input.dll");

mod.NativeWrite("output.dll"); // crashes here

[FickoDeLux]

I did
https://github.com/0xd4d/dnlib/issues/533
Thank You