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stress.go
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stress.go
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// Copyright 2015 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"math/rand"
"os"
"runtime"
"sync"
"sync/atomic"
"time"
"github.com/google/syzkaller/pkg/db"
"github.com/google/syzkaller/pkg/host"
"github.com/google/syzkaller/pkg/ipc"
. "github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/prog"
_ "github.com/google/syzkaller/sys"
)
var (
flagOS = flag.String("os", runtime.GOOS, "target os")
flagArch = flag.String("arch", runtime.GOARCH, "target arch")
flagCorpus = flag.String("corpus", "", "corpus database")
flagOutput = flag.Bool("output", false, "print executor output to console")
flagProcs = flag.Int("procs", 2*runtime.NumCPU(), "number of parallel processes")
flagLogProg = flag.Bool("logprog", false, "print programs before execution")
flagGenerate = flag.Bool("generate", true, "generate new programs, otherwise only mutate corpus")
statExec uint64
gate *ipc.Gate
)
const programLength = 30
func main() {
flag.Parse()
target, err := prog.GetTarget(*flagOS, *flagArch)
if err != nil {
Fatalf("%v", err)
}
corpus := readCorpus(target)
Logf(0, "parsed %v programs", len(corpus))
if !*flagGenerate && len(corpus) == 0 {
Fatalf("nothing to mutate (-generate=false and no corpus)")
}
calls := buildCallList(target)
prios := target.CalculatePriorities(corpus)
ct := target.BuildChoiceTable(prios, calls)
config, execOpts, err := ipc.DefaultConfig()
if err != nil {
Fatalf("%v", err)
}
gate = ipc.NewGate(2**flagProcs, nil)
for pid := 0; pid < *flagProcs; pid++ {
pid := pid
go func() {
env, err := ipc.MakeEnv(config, pid)
if err != nil {
Fatalf("failed to create execution environment: %v", err)
}
rs := rand.NewSource(time.Now().UnixNano() + int64(pid)*1e12)
rnd := rand.New(rs)
for i := 0; ; i++ {
var p *prog.Prog
if *flagGenerate && len(corpus) == 0 || i%4 != 0 {
p = target.Generate(rs, programLength, ct)
execute(pid, env, execOpts, p)
p.Mutate(rs, programLength, ct, corpus)
execute(pid, env, execOpts, p)
} else {
p = corpus[rnd.Intn(len(corpus))].Clone()
p.Mutate(rs, programLength, ct, corpus)
execute(pid, env, execOpts, p)
p.Mutate(rs, programLength, ct, corpus)
execute(pid, env, execOpts, p)
}
}
}()
}
for range time.NewTicker(5 * time.Second).C {
Logf(0, "executed %v programs", atomic.LoadUint64(&statExec))
}
}
var outMu sync.Mutex
func execute(pid int, env *ipc.Env, execOpts *ipc.ExecOpts, p *prog.Prog) {
atomic.AddUint64(&statExec, 1)
if *flagLogProg {
ticket := gate.Enter()
defer gate.Leave(ticket)
outMu.Lock()
fmt.Printf("executing program %v\n%s\n", pid, p.Serialize())
outMu.Unlock()
}
output, _, failed, hanged, err := env.Exec(execOpts, p)
if err != nil {
fmt.Printf("failed to execute executor: %v\n", err)
}
if failed || hanged || err != nil || *flagOutput {
fmt.Printf("PROGRAM:\n%s\n", p.Serialize())
}
if failed || hanged || err != nil || *flagOutput {
os.Stdout.Write(output)
}
}
func readCorpus(target *prog.Target) []*prog.Prog {
if *flagCorpus == "" {
return nil
}
db, err := db.Open(*flagCorpus)
if err != nil {
Fatalf("failed to open corpus database: %v", err)
}
var progs []*prog.Prog
for _, rec := range db.Records {
p, err := target.Deserialize(rec.Val)
if err != nil {
Fatalf("failed to deserialize corpus program: %v", err)
}
progs = append(progs, p)
}
return progs
}
func buildCallList(target *prog.Target) map[*prog.Syscall]bool {
if *flagOS != runtime.GOOS {
// This is currently used on akaros, where syz-stress runs on host.
calls := make(map[*prog.Syscall]bool)
for _, c := range target.Syscalls {
calls[c] = true
}
return calls
}
calls, disabled, err := host.DetectSupportedSyscalls(target, "none")
if err != nil {
Logf(0, "failed to detect host supported syscalls: %v", err)
calls = make(map[*prog.Syscall]bool)
for _, c := range target.Syscalls {
calls[c] = true
}
}
for c, reason := range disabled {
Logf(0, "unsupported syscall: %v: %v", c.Name, reason)
}
calls, disabled = target.TransitivelyEnabledCalls(calls)
for c, reason := range disabled {
Logf(0, "transitively unsupported: %v: %v", c.Name, reason)
}
return calls
}