Copy fuzzers from github.com/cncf/cncf-fuzzing

This commit copies the fuzzers from the repository except for
containerd_import_structured_fuzzer.go.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

contrib/fuzz/fuzz_images.go

@@ -0,0 +1,46 @@
+// Copyright 2021 ADA Logics Ltd
+//
+// 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 fuzz
+
+import (
+	"context"
+	"os"
+
+	fuzz "github.com/AdaLogics/go-fuzz-headers"
+	"github.com/containerd/containerd/content/local"
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/platforms"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+func FuzzImagesCheck(data []byte) int {
+	f := fuzz.NewConsumer(data)
+	desc := ocispec.Descriptor{}
+	err := f.GenerateStruct(&desc)
+	if err != nil {
+		return 0
+	}
+	tmpdir, err := os.MkdirTemp("", "fuzzing-")
+	if err != nil {
+		return 0
+	}
+	cs, err := local.NewStore(tmpdir)
+	if err != nil {
+		return 0
+	}
+	_, _, _, _, _ = images.Check(context.Background(), cs, desc, platforms.Default())
+	return 1
+}