Add fuzz targets for Duration, MicroTime, and Time

Author: Brendan Chang

test/fuzz/yaml/BUILD

@@ -6,6 +6,7 @@ go_library(
     importpath = "k8s.io/kubernetes/test/fuzz/yaml",
     visibility = ["//visibility:private"],
     deps = [
+        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//vendor/gopkg.in/yaml.v2:go_default_library",
         "//vendor/sigs.k8s.io/yaml:go_default_library",
     ],

test/fuzz/yaml/yaml.go

@@ -20,10 +20,51 @@ limitations under the License.
 package yaml
 
 import (
+	"bytes"
+
 	"gopkg.in/yaml.v2"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	sigyaml "sigs.k8s.io/yaml"
 )
 
+// FuzzDuration is a fuzz target for unmarshaling Duration defined in "k8s.io/apimachinery/pkg/apis/meta/v1".
+// This target also checks that the unmarshaled result can be marshaled back to the input.
+func FuzzDuration(b []byte) int {
+	var unmarshalResult struct {
+		D metav1.Duration `json:"d"`
+	}
+	if err := yaml.Unmarshal(b, &unmarshalResult); err != nil {
+		return 0
+	}
+	marshalResult, err := yaml.Marshal(&unmarshalResult)
+	if err != nil {
+		panic(err)
+	}
+	if !bytes.Equal(marshalResult, b) {
+		panic("marshalResult != input")
+	}
+	return 1
+}
+
+// FuzzMicroTime is a fuzz target for unmarshaling MicroTime defined in "k8s.io/apimachinery/pkg/apis/meta/v1".
+// This target also checks that the unmarshaled result can be marshaled back to the input.
+func FuzzMicroTime(b []byte) int {
+	var unmarshalResult struct {
+		T metav1.MicroTime `json:"t"`
+	}
+	if err := yaml.Unmarshal(b, &unmarshalResult); err != nil {
+		return 0
+	}
+	marshalResult, err := yaml.Marshal(&unmarshalResult)
+	if err != nil {
+		panic(err)
+	}
+	if !bytes.Equal(marshalResult, b) {
+		panic("marshalResult != input")
+	}
+	return 1
+}
+
 // FuzzSigYaml is a fuzz target for "sigs.k8s.io/yaml" unmarshaling.
 func FuzzSigYaml(b []byte) int {
 	t := struct{}{}
@@ -38,6 +79,25 @@ func FuzzSigYaml(b []byte) int {
 	return out
 }
 
+// FuzzTime is a fuzz target for unmarshaling Time defined in "k8s.io/apimachinery/pkg/apis/meta/v1".
+// This target also checks that the unmarshaled result can be marshaled back to the input.
+func FuzzTime(b []byte) int {
+	var unmarshalResult struct {
+		T metav1.Time `json:"t"`
+	}
+	if err := yaml.Unmarshal(b, &unmarshalResult); err != nil {
+		return 0
+	}
+	marshalResult, err := yaml.Marshal(&unmarshalResult)
+	if err != nil {
+		panic(err)
+	}
+	if !bytes.Equal(marshalResult, b) {
+		panic("marshalResult != input")
+	}
+	return 1
+}
+
 // FuzzYamlV2 is a fuzz target for "gopkg.in/yaml.v2" unmarshaling.
 func FuzzYamlV2(b []byte) int {
 	t := struct{}{}