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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fuzz
import (
"context"
"flag"
"fmt"
"io"
"os"
"os/signal"
"reflect"
"testing"
)
var benchmarkWorkerFlag = flag.Bool("benchmarkworker", false, "")
func TestMain(m *testing.M) {
flag.Parse()
if *benchmarkWorkerFlag {
runBenchmarkWorker()
return
}
os.Exit(m.Run())
}
func BenchmarkWorkerFuzzOverhead(b *testing.B) {
origEnv := os.Getenv("GODEBUG")
defer func() { os.Setenv("GODEBUG", origEnv) }()
os.Setenv("GODEBUG", fmt.Sprintf("%s,fuzzseed=123", origEnv))
ws := &workerServer{
fuzzFn: func(_ CorpusEntry) error { return nil },
workerComm: workerComm{memMu: make(chan *sharedMem, 1)},
}
mem, err := sharedMemTempFile(workerSharedMemSize)
if err != nil {
b.Fatalf("failed to create temporary shared memory file: %s", err)
}
defer func() {
if err := mem.Close(); err != nil {
b.Error(err)
}
}()
initialVal := []interface{}{make([]byte, 32)}
encodedVals := marshalCorpusFile(initialVal...)
mem.setValue(encodedVals)
ws.memMu <- mem
b.ResetTimer()
for i := 0; i < b.N; i++ {
ws.m = newMutator()
mem.setValue(encodedVals)
mem.header().count = 0
ws.fuzz(context.Background(), fuzzArgs{Limit: 1})
}
}
// BenchmarkWorkerPing acts as the coordinator and measures the time it takes
// a worker to respond to N pings. This is a rough measure of our RPC latency.
func BenchmarkWorkerPing(b *testing.B) {
b.SetParallelism(1)
w := newWorkerForTest(b)
for i := 0; i < b.N; i++ {
if err := w.client.ping(context.Background()); err != nil {
b.Fatal(err)
}
}
}
// BenchmarkWorkerFuzz acts as the coordinator and measures the time it takes
// a worker to mutate a given input and call a trivial fuzz function N times.
func BenchmarkWorkerFuzz(b *testing.B) {
b.SetParallelism(1)
w := newWorkerForTest(b)
entry := CorpusEntry{Values: []interface{}{[]byte(nil)}}
entry.Data = marshalCorpusFile(entry.Values...)
for i := int64(0); i < int64(b.N); {
args := fuzzArgs{
Limit: int64(b.N) - i,
Timeout: workerFuzzDuration,
}
_, resp, err := w.client.fuzz(context.Background(), entry, args)
if err != nil {
b.Fatal(err)
}
if resp.Err != "" {
b.Fatal(resp.Err)
}
if resp.Count == 0 {
b.Fatal("worker did not make progress")
}
i += resp.Count
}
}
// newWorkerForTest creates and starts a worker process for testing or
// benchmarking. The worker process calls RunFuzzWorker, which responds to
// RPC messages until it's stopped. The process is stopped and cleaned up
// automatically when the test is done.
func newWorkerForTest(tb testing.TB) *worker {
tb.Helper()
c, err := newCoordinator(CoordinateFuzzingOpts{
Types: []reflect.Type{reflect.TypeOf([]byte(nil))},
Log: io.Discard,
})
if err != nil {
tb.Fatal(err)
}
dir := "" // same as self
binPath := os.Args[0] // same as self
args := append(os.Args[1:], "-benchmarkworker")
env := os.Environ() // same as self
w, err := newWorker(c, dir, binPath, args, env)
if err != nil {
tb.Fatal(err)
}
tb.Cleanup(func() {
if err := w.cleanup(); err != nil {
tb.Error(err)
}
})
if err := w.startAndPing(context.Background()); err != nil {
tb.Fatal(err)
}
tb.Cleanup(func() {
if err := w.stop(); err != nil {
tb.Error(err)
}
})
return w
}
func runBenchmarkWorker() {
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
defer cancel()
fn := func(CorpusEntry) error { return nil }
if err := RunFuzzWorker(ctx, fn); err != nil && err != ctx.Err() {
panic(err)
}
}
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