fuzz: add tendermint/go-amino.DecodeTime (cosmos#9195)

go-amino is a heavily used dependency and given that
Tendermrint isn't yet setup for oss-fuzz, this change
is a start for it.

While here, add the oss-fuzz entry for crypto/types.BitArray
CompactUnmarshal fuzzer for PR cosmos#9166.

Updates cosmos#7921

fuzz/oss-fuzz-build.sh

@@ -4,6 +4,10 @@ export FUZZ_ROOT="github.com/cosmos/cosmos-sdk"
 
 compile_go_fuzzer "$FUZZ_ROOT"/fuzz/crypto/hd/deriveprivatekeyforpath Fuzz fuzz_crypto_hd_deriveprivatekeyforpath fuzz
 
+compile_go_fuzzer "$FUZZ_ROOT"/fuzz/crypto/types/compactbitarray/marshalunmarshal Fuzz fuzz_crypto_types_compactbitarray_marshalunmarshal fuzz
+
+compile_go_fuzzer "$FUZZ_ROOT"/fuzz/tendermint/amino/decodetime Fuzz fuzz_tendermint_amino_decodetime fuzz
+
 compile_go_fuzzer "$FUZZ_ROOT"/fuzz/types/parsecoin Fuzz fuzz_types_parsecoin fuzz
 compile_go_fuzzer "$FUZZ_ROOT"/fuzz/types/parsedeccoin Fuzz fuzz_types_parsedeccoin fuzz
 compile_go_fuzzer "$FUZZ_ROOT"/fuzz/types/parsetimebytes Fuzz fuzz_types_parsetimebytes fuzz

fuzz/tendermint/amino/DecodeTime/corpus/2.txt

@@ -0,0 +1 @@
+������

fuzz/tendermint/amino/DecodeTime/corpus/3.txt

@@ -0,0 +1 @@
+����
؝�

fuzz/tendermint/amino/DecodeTime/corpus/4.txt

@@ -0,0 +1 @@
+�墕𓝚

fuzz/tendermint/amino/DecodeTime/corpus/5.txt

@@ -0,0 +1 @@
+����𓝚

fuzz/tendermint/amino/DecodeTime/corpus/6.txt

@@ -0,0 +1 @@
+����𓝚

fuzz/tendermint/amino/DecodeTime/corpus/7.txt

@@ -0,0 +1 @@
+����𓝚

fuzz/tendermint/amino/DecodeTime/corpus/9d1996cb2f705ac232aa433ece29827b7939f32d-1

@@ -0,0 +1 @@
+

fuzz/tendermint/amino/DecodeTime/corpus/bd562f1af1c208bddcc6b5dc96a9265e644774a9-1

@@ -0,0 +1 @@
+

fuzz/tendermint/amino/DecodeTime/corpus/ff4d5d151fbb8564c87c8358f4de12e218be0488-1

@@ -0,0 +1 @@
+

fuzz/tendermint/amino/DecodeTime/fuzz.go

@@ -0,0 +1,24 @@
+package decodetime
+
+import (
+	"fmt"
+
+	amino "github.com/tendermint/go-amino"
+)
+
+func Fuzz(data []byte) int {
+	if len(data) == 0 {
+		return -1
+	}
+	t, n, err := amino.DecodeTime(data)
+	if err != nil {
+		return -1
+	}
+	if n < 0 {
+		panic(fmt.Sprintf("n=%d < 0", n))
+	}
+	if t.IsZero() {
+		return 0
+	}
+	return 1
+}

fuzz/tendermint/amino/DecodeTime/gen/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	amino "github.com/tendermint/go-amino"
+)
+
+func main() {
+	times := []time.Time{
+		time.Unix(0, 0),
+		time.Now(),
+		time.Date(1979, time.January, 02, 10, 11, 12, 7999192, time.UTC),
+		time.Now().Add(10000 * time.Hour),
+		time.Now().Add(100 * time.Hour),
+		time.Now().Add(-100 * time.Hour),
+		time.Now().Add(-10000 * time.Hour),
+	}
+
+	for i, t := range times {
+		func() {
+			f, err := os.Create(fmt.Sprintf("%d.txt", i+1))
+			if err != nil {
+				panic(err)
+			}
+			defer f.Close()
+
+			if err := amino.EncodeTime(f, t); err != nil {
+				panic(err)
+			}
+		}()
+	}
+}