From 59186586caec99148c72cd89be58049644837aaa Mon Sep 17 00:00:00 2001
From: Marius van der Wijden <m.vanderwijden@live.de>
Date: Fri, 8 Dec 2023 08:16:41 +0100
Subject: [PATCH 1/2] README: main: switch from go-fuzz to the builtin fuzzer

---
 README.md |  2 +-
 main.go   | 34 ++++++----------------------------
 2 files changed, 7 insertions(+), 29 deletions(-)

diff --git a/README.md b/README.md
index d793074..1b8e58d 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ FuzzyVM creates state tests that can be used to differential fuzz EVM implementa
 It only focus on the test generation part, the test execution is handled by [goevmlab](https://github.com/holiman/goevmlab).
 
 ## Environment
-You need to have golang, go-fuzz, go-fuzz-build, and go-ethereum installed
+You need to have golang and go-ethereum installed
 
 ## Install instructions
 
diff --git a/main.go b/main.go
index 62e614a..bfec3db 100644
--- a/main.go
+++ b/main.go
@@ -56,12 +56,6 @@ var minCorpusCommand = &cli.Command{
 	Action: minimizeCorpus,
 }
 
-var buildCommand = &cli.Command{
-	Name:   "build",
-	Usage:  "Builds the fuzzer",
-	Action: build,
-}
-
 var runCommand = &cli.Command{
 	Name:   "run",
 	Usage:  "Runs the fuzzer",
@@ -79,7 +73,6 @@ func initApp() *cli.App {
 		benchCommand,
 		corpusCommand,
 		minCorpusCommand,
-		buildCommand,
 		runCommand,
 	}
 	return app
@@ -125,24 +118,6 @@ func corpus(c *cli.Context) error {
 	return nil
 }
 
-func build(c *cli.Context) error {
-	cmdName := "go-fuzz-build"
-	// ignore x/exp/rand, otherwise the build will fail, see also https://github.com/dvyukov/go-fuzz/issues/331
-	args := []string{
-		"-preserve",
-		"golang.org/x/exp/rand",
-	}
-	cmd := exec.Command(cmdName, args...)
-	cmd.Dir = "fuzzer"
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	// We have to disable CGO
-	cgo := "CGO_ENABLED=0"
-	env := append(os.Environ(), cgo)
-	cmd.Env = env
-	return cmd.Run()
-}
-
 func run(c *cli.Context) error {
 	directories := []string{
 		outputRootDir,
@@ -158,9 +133,12 @@ func run(c *cli.Context) error {
 }
 
 func startGenerator(genThreads int) *exec.Cmd {
-	cmdName := "go-fuzz"
-	dir := "./fuzzer/fuzzer-fuzz.zip"
-	cmd := exec.Command(cmdName, "--bin", dir, "--procs", fmt.Sprint(genThreads))
+	var (
+		cmdName = "go"
+		target  = "FuzzVM"
+		dir     = "./fuzzer/..."
+	)
+	cmd := exec.Command(cmdName, "test", "--fuzz", target, "--parallel", fmt.Sprint(genThreads), dir)
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	if err := cmd.Start(); err != nil {

From 636750ef2f990df293078389fccd41bd4f001c7a Mon Sep 17 00:00:00 2001
From: Marius van der Wijden <m.vanderwijden@live.de>
Date: Fri, 8 Dec 2023 08:17:20 +0100
Subject: [PATCH 2/2] README: main: switch from go-fuzz to the builtin fuzzer

---
 README.md | 2 --
 1 file changed, 2 deletions(-)

diff --git a/README.md b/README.md
index 1b8e58d..9ccb3ad 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,6 @@ git clone git@github.com:MariusVanDerWijden/FuzzyVM.git
 cd FuzzyVM
 # Build the binary
 go build
-# Create the fuzz-test generator as follows:
-./FuzzyVM build
 # Create an initial corpus
 ./FuzzyVM corpus --count 100  
 # Run the fuzzer