Directly test bufbuild/protocompile, instead of going through jhump/p…

…rotoreflect/desc/protoparse (#12504)

I've recently merged a long-lived "v2" branch to main in the
`github.com/jhump/protoreflect` repo. The v2 of that repo does _not_
include a protoparse package, since that has been effectively replaced
by `github.com/bufbuild/protocompile`. (Since v1.15 of protoreflect, the
protoparse package is just API veneer on top of protocompile.)

After I did that merge of v2 to main, the fuzzer for the project began
to fail since the packages are no longer present:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=71629
So this updates the fuzzer configuration to directly test the underlying
protocompile module.

There was also a fuzz tester for the
`github.com/jhump/protoreflect/dynamic` package, but it was not actually
enabled. (It was disabled in #6369 but neither the PR description nor
comment threads describe why this test was problematic 🤷.) Anyhow, that
package has also been removed for v2, effectively replaced by
`google.golang.org/protobuf/types/dynamicpb`. So this PR deletes it
completely from the oss-fuzz repo.

projects/protoreflect/Dockerfile → projects/protocompile/Dockerfile

@@ -15,10 +15,9 @@
 ################################################################################
 
 FROM gcr.io/oss-fuzz-base/base-builder-go
-RUN git clone --depth 1 https://github.com/jhump/protoreflect
+RUN git clone --depth 1 https://github.com/bufbuild/protocompile
 
-COPY fuzz_protoparse.go $SRC/protoreflect/desc/protoparse/
-COPY fuzz_dynamic.go $SRC/protoreflect/proto_decoder/
+COPY fuzz_protocompile.go $SRC/protocompile
 
 COPY build.sh $SRC/
-WORKDIR $SRC/protoreflect
+WORKDIR $SRC/protocompile

projects/protoreflect/build.sh → projects/protocompile/build.sh

@@ -15,6 +15,5 @@
 #
 ################################################################################
 
-compile_go_fuzzer github.com/jhump/protoreflect/desc/protoparse FuzzProtoParse fuzz_protoparse
-# compile_go_fuzzer github.com/jhump/protoreflect/proto_decoder Fuzz fuzz_dynamic
+compile_go_fuzzer github.com/bufbuild/protocompile FuzzProtoCompile fuzz_protocompile
 

projects/protocompile/fuzz_protocompile.go

@@ -0,0 +1,37 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package protocompile
+
+import (
+	"bytes"
+	"context"
+	"io"
+)
+
+func FuzzProtoCompile(data []byte) int {
+	compiler := &Compiler{
+		Resolver: &SourceResolver{
+			Accessor: func(_ string) (closer io.ReadCloser, e error) {
+				return io.NopCloser(bytes.NewReader(data)), nil
+			},
+		},
+	}
+
+	_, err := compiler.Compile(context.Background(), "test.proto")
+	if err != nil {
+		return 0
+	}
+	return 1
+}

projects/protocompile/project.yaml

@@ -0,0 +1,10 @@
+homepage: "https://github.com/bufbuild/protocompile"
+primary_contact: "jhumphries@buf.build"
+auto_ccs:
+  - "oss-fuzz-reports@buf.build"
+language: go
+fuzzing_engines:
+  - libfuzzer
+sanitizers:
+  - address
+main_repo: 'https://github.com/bufbuild/protocompile'