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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"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/google/syzkaller/pkg/csource"
"github.com/google/syzkaller/pkg/db"
"github.com/google/syzkaller/pkg/host"
"github.com/google/syzkaller/pkg/ipc"
"github.com/google/syzkaller/pkg/ipc/ipcconfig"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/mgrconfig"
"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")
flagSyscalls = flag.String("syscalls", "", "comma-separated list of enabled syscalls")
flagEnable = flag.String("enable", "none", "enable only listed additional features")
flagDisable = flag.String("disable", "none", "enable all additional features except listed")
statExec uint64
gate *ipc.Gate
)
const programLength = 30
func main() {
flag.Usage = func() {
flag.PrintDefaults()
csource.PrintAvailableFeaturesFlags()
}
flag.Parse()
featuresFlags, err := csource.ParseFeaturesFlags(*flagEnable, *flagDisable, true)
if err != nil {
log.Fatalf("%v", err)
}
target, err := prog.GetTarget(*flagOS, *flagArch)
if err != nil {
log.Fatalf("%v", err)
}
corpus, err := db.ReadCorpus(*flagCorpus, target)
if err != nil {
log.Fatalf("failed to read corpus: %v", err)
}
log.Logf(0, "parsed %v programs", len(corpus))
if !*flagGenerate && len(corpus) == 0 {
log.Fatalf("nothing to mutate (-generate=false and no corpus)")
}
features, err := host.Check(target)
if err != nil {
log.Fatalf("%v", err)
}
var syscalls []string
if *flagSyscalls != "" {
syscalls = strings.Split(*flagSyscalls, ",")
}
calls := buildCallList(target, syscalls)
prios := target.CalculatePriorities(corpus)
ct := target.BuildChoiceTable(prios, calls)
config, execOpts, err := createIPCConfig(target, features, featuresFlags)
if err != nil {
log.Fatalf("%v", err)
}
if err = host.Setup(target, features, featuresFlags, config.Executor); err != nil {
log.Fatal(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 {
log.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 {
log.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, _, hanged, err := env.Exec(execOpts, p)
if err != nil {
fmt.Printf("failed to execute executor: %v\n", err)
}
if hanged || err != nil || *flagOutput {
fmt.Printf("PROGRAM:\n%s\n", p.Serialize())
}
if hanged || err != nil || *flagOutput {
os.Stdout.Write(output)
}
}
func createIPCConfig(target *prog.Target, features *host.Features, featuresFlags csource.Features) (
*ipc.Config, *ipc.ExecOpts, error) {
config, execOpts, err := ipcconfig.Default(target)
if err != nil {
return nil, nil, err
}
if featuresFlags["tun"].Enabled && features[host.FeatureNetInjection].Enabled {
config.Flags |= ipc.FlagEnableTun
}
if featuresFlags["net_dev"].Enabled && features[host.FeatureNetDevices].Enabled {
config.Flags |= ipc.FlagEnableNetDev
}
if featuresFlags["net_reset"].Enabled {
config.Flags |= ipc.FlagEnableNetReset
}
if featuresFlags["cgroups"].Enabled {
config.Flags |= ipc.FlagEnableCgroups
}
if featuresFlags["close_fds"].Enabled {
config.Flags |= ipc.FlagEnableCloseFds
}
if featuresFlags["devlink_pci"].Enabled && features[host.FeatureDevlinkPCI].Enabled {
config.Flags |= ipc.FlagEnableDevlinkPCI
}
return config, execOpts, nil
}
func buildCallList(target *prog.Target, enabled []string) 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 {
log.Fatalf("failed to detect host supported syscalls: %v", err)
}
if len(enabled) != 0 {
syscallsIDs, err := mgrconfig.ParseEnabledSyscalls(target, enabled, nil)
if err != nil {
log.Fatalf("failed to parse enabled syscalls: %v", err)
}
enabledSyscalls := make(map[*prog.Syscall]bool)
for _, id := range syscallsIDs {
enabledSyscalls[target.Syscalls[id]] = true
}
for c := range calls {
if !enabledSyscalls[c] {
delete(calls, c)
}
}
for c := range disabled {
if !enabledSyscalls[c] {
delete(disabled, c)
}
}
}
for c, reason := range disabled {
log.Logf(0, "unsupported syscall: %v: %v", c.Name, reason)
}
calls, disabled = target.TransitivelyEnabledCalls(calls)
for c, reason := range disabled {
log.Logf(0, "transitively unsupported: %v: %v", c.Name, reason)
}
return calls
}