nathaniel-bennett / winsharpfuzz Goto Github PK

Hi,
I am currently trying to automate fuzzing of .net dlls with WinSharpFuzz.

I have fuzzed several dlls and always get the same cov (8), ft (8) and corp (1/1b) in the output of libFuzzer.

The dlls are instrumented and the path to the dll is added as hintpath to the project.

WinSharpFuzz is added via dotnet add "pathToProjectFile" package WinSharpFuzz

Im currently running the Fuzzer with: winsharpfuzz --target_path="pathToExe" "pathToTestDir" -print_final_stats=1 -workers=1

There are several file types in the test directory (txt, json, pdf, xml,...).
Does libfuzzer manage to select a suitable testcase based on the coverage?

Edit:
I think the winsharpfuzz-libfuzzer-x64.exe included in the package is not working properly. I have compiled a new one which seems to work.

Hi,

I've discovered this project from looking into SharpFuzz and this project seems to be actively worked on. I've ran into a problem trying to follow the documentation but it appears I can't seem to get this run. When I run the following command: winsharpfuzz --target_path="testingIdea/bin/Debug/netcoreapp3.1/testingIdea.exe" "testcases" -jobs=8
I get the following output:
Executing process...
The application appear to crash/hangs - I'm not too sure what I've been doing wrong. I've been trying to follow your docs and get them to work with this example from SharpFuzz.

Here are my project file if that helps:

Program.cs

using System;
using SharpFuzz;
using System.IO;

namespace Jil.testingIdea
{
    class Program
    {
        static void Main(string[] args)
        {
            Fuzzer.OutOfProcess.Run(stream => {

                try
                {
                    using (var reader = new StreamReader(stream))
                    {
                        JSON.DeserializeDynamic(reader);
                    }
                }
                catch (ArgumentException) { }
                catch (DeserializationException) { }

            });
        }
    }
}

csproj file -

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

	<ItemGroup>
		<PackageReference Include="SharpFuzz" Version="1.6.2" />
		<PackageReference Include="WinSharpFuzz" Version="1.0.0" />

	</ItemGroup>

	<ItemGroup>
	  <Reference Include="Jil">
	    <HintPath>..\..\sharpfuz\Jil.dll</HintPath>
	  </Reference>
	</ItemGroup>

</Project>

Any assistance with this would be a great help - Thanks