Remove old libfuzzer dotnet template (#2875)

### Context
The original `libfuzzer dotnet` job template was a proof of concept that demonstrated how the `libfuzzer_fuzz` task could be used to express fuzzing via the (pre SharpFuzz 2.0) `libfuzzer-dotnet` tool. It (and its associated integration test) used a harness that linked an older version of SharpFuzz, and which is incompatible with LibFuzzerDotnetLoader (which requires SharpFuzz 2.0 or greater).

### Changes
- Rename `libfuzzer dotnet_dll` job template to `libfuzzer dotnet`, making it the _only_ `libfuzzer-dotnet` template
- Remove integration tests and docs for the old proof-of-concept job type

### Notice

This is a breaking change.

Closes #2874.

src/integration-tests/integration-test.py

@@ -59,7 +59,6 @@ class TaskTestState(Enum):
 class TemplateType(Enum):
     libfuzzer = "libfuzzer"
     libfuzzer_dotnet = "libfuzzer_dotnet"
-    libfuzzer_dotnet_dll = "libfuzzer_dotnet_dll"
     libfuzzer_qemu_user = "libfuzzer_qemu_user"
     afl = "afl"
     radamsa = "radamsa"
@@ -153,16 +152,6 @@ TARGETS: Dict[str, Integration] = {
     "linux-libfuzzer-dotnet": Integration(
         template=TemplateType.libfuzzer_dotnet,
         os=OS.linux,
-        target_exe="wrapper",
-        nested_setup_dir="my-fuzzer",
-        inputs="inputs",
-        use_setup=True,
-        wait_for_files={ContainerType.inputs: 2, ContainerType.crashes: 1},
-        test_repro=False,
-    ),
-    "linux-libfuzzer-dotnet-dll": Integration(
-        template=TemplateType.libfuzzer_dotnet_dll,
-        os=OS.linux,
         setup_dir="GoodBadDotnet",
         target_exe="GoodBadDotnet/GoodBad.dll",
         target_options=["-max_len=4", "-only_ascii=1", "-seed=1"],
@@ -245,8 +234,8 @@ TARGETS: Dict[str, Integration] = {
         },
         use_setup=True,
     ),
-    "windows-libfuzzer-dotnet-dll": Integration(
-        template=TemplateType.libfuzzer_dotnet_dll,
+    "windows-libfuzzer-dotnet": Integration(
+        template=TemplateType.libfuzzer_dotnet,
         os=OS.windows,
         setup_dir="GoodBadDotnet",
         target_exe="GoodBadDotnet/GoodBad.dll",

src/integration-tests/libfuzzer-dotnet/.gitignore

@@ -1,5 +0,0 @@
-problems/obj
-problems/bin
-wrapper/obj
-wrapper/bin
-my-fuzzer

src/integration-tests/libfuzzer-dotnet/Makefile

@@ -1,24 +0,0 @@
-all: check
-
-libfuzzer-dotnet:
-	mkdir -p my-fuzzer
-	# direct url to a known-good instance of libfuzzer-dotnet.cc
-	curl -o libfuzzer-dotnet.cc https://raw.githubusercontent.com/Metalnem/libfuzzer-dotnet/543b170a67bdd39e9ba260fe54bc93c77b877c24/libfuzzer-dotnet.cc
-	clang -fsanitize=fuzzer libfuzzer-dotnet.cc -o my-fuzzer/libfuzzer-dotnet
-	rm -f libfuzzer-dotnet.cc
-
-build-harness: libfuzzer-dotnet
-	dotnet tool install --global SharpFuzz.CommandLine || echo already installed
-	dotnet publish ./wrapper/wrapper.csproj -c release -o my-fuzzer -r linux-x64
-	sharpfuzz my-fuzzer/problems.dll || echo already instrumented
-
-check: build-harness
-	./my-fuzzer/libfuzzer-dotnet --target_path=./my-fuzzer/wrapper -runs=1
-
-fuzz: check
-	./my-fuzzer/libfuzzer-dotnet --target_path=./my-fuzzer/wrapper
-
-.PHONY: clean
-
-clean:
-	rm -rf fuzz.exe libfuzzer-dotnet my-fuzzer wrapper/bin wrapper/obj problems/bin problems/obj

src/integration-tests/libfuzzer-dotnet/inputs/hi.txt

@@ -1 +0,0 @@
-hi

src/integration-tests/libfuzzer-dotnet/problems/problems.cs

@@ -1,15 +0,0 @@
-using System;
-namespace Problems {
-  public static class Problems {
-    public static void Func(ReadOnlySpan<byte> data) {
-      var count = 0;
-      if (data.Length < 4) {
-         return;
-      }
-      if (data[0] == 0) { count++; } 
-      if (data[1] == 1) { count++; }
-      if (data[2] == 2) { count++; }
-      if (count >= 3) { throw new Exception("this is bad"); }
-    }
-  }
-}

src/integration-tests/libfuzzer-dotnet/problems/problems.csproj

@@ -1,7 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
-  </PropertyGroup>
-
-</Project>

src/integration-tests/libfuzzer-dotnet/wrapper/program.cs

@@ -1,8 +0,0 @@
-using SharpFuzz;
-namespace Wrapper {
-  public class Program {
-    public static void Main(string[] args) {
-      Fuzzer.LibFuzzer.Run(stream => { Problems.Problems.Func(stream); });
-    }
-  }
-}

src/integration-tests/libfuzzer-dotnet/wrapper/wrapper.csproj

@@ -1,15 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-  <ItemGroup>
-     <ProjectReference Include="..\problems\problems.csproj" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <PackageReference Include="SharpFuzz" Version="1.6.1" />
-  </ItemGroup>
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
-  </PropertyGroup>
-
-</Project>