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// Copyright 2021 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 (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"time"
"github.com/google/syzkaller/pkg/config"
"github.com/google/syzkaller/pkg/osutil"
)
type Instance interface {
Run() error
Stop()
FetchResult() (RunResult, error)
Uptime() time.Duration
}
// The essential information about an active instance.
type InstanceCommon struct {
Name string
LogFile string
ExecCommand string
ExecCommandArgs []string
StartedAt time.Time
StoppedAt time.Time
stopChannel chan bool
}
func (inst *InstanceCommon) Run() error {
const stopDelay = time.Minute
log.Printf("[%s] starting", inst.Name)
cmd := osutil.GraciousCommand(inst.ExecCommand, inst.ExecCommandArgs...)
if inst.LogFile != "" {
logfile, err := os.Create(inst.LogFile)
if err != nil {
return fmt.Errorf("[%s] failed to create logfile: %s", inst.Name, err)
}
cmd.Stdout = logfile
cmd.Stderr = logfile
}
complete := make(chan error)
inst.StartedAt = time.Now()
cmd.Start()
go func() {
complete <- cmd.Wait()
}()
select {
case err := <-complete:
return err
case <-inst.stopChannel:
// TODO: handle other OSes?
cmd.Process.Signal(os.Interrupt)
select {
case <-complete:
// The manager has exited.
case <-time.After(stopDelay):
// The manager did not exit - kill it.
log.Printf("[%s] instance did not exit itself, killing it", inst.Name)
cmd.Process.Kill()
<-complete
}
}
inst.StoppedAt = time.Now()
return nil
}
func (inst *InstanceCommon) Stop() {
select {
case inst.stopChannel <- true:
default:
}
}
func (inst *InstanceCommon) Uptime() time.Duration {
if !inst.StartedAt.IsZero() && inst.StoppedAt.IsZero() {
return time.Since(inst.StartedAt)
}
return inst.StoppedAt.Sub(inst.StartedAt)
}
type SyzManagerInstance struct {
InstanceCommon
SyzkallerInfo
RunTime time.Duration
}
func (inst *SyzManagerInstance) FetchResult() (RunResult, error) {
bugs, err := collectBugs(inst.Workdir)
if err != nil {
return nil, err
}
records, err := readBenches(inst.BenchFile)
if err != nil {
return nil, err
}
return &SyzManagerResult{
Bugs: bugs,
StatRecords: records,
}, nil
}
func (inst *SyzManagerInstance) Run() error {
ret := make(chan error, 1)
go func() {
ret <- inst.InstanceCommon.Run()
}()
select {
case err := <-ret:
// Syz-managers are not supposed to stop themselves under normal circumstances.
// If one of them did stop, there must have been a very good reason to do so.
return fmt.Errorf("[%s] stopped: %v", inst.Name, err)
case <-time.After(inst.RunTime):
inst.Stop()
<-ret
return nil
}
}
type SyzkallerInfo struct {
Workdir string
CfgFile string
BenchFile string
}
func SetupSyzkallerInstance(mgrName, folder string, checkout *Checkout) (*SyzkallerInfo, error) {
workdir := filepath.Join(folder, "workdir")
log.Printf("[%s] Generating workdir", mgrName)
err := osutil.MkdirAll(workdir)
if err != nil {
return nil, fmt.Errorf("failed to create workdir %s", workdir)
}
log.Printf("[%s] Generating syz-manager config", mgrName)
cfgFile := filepath.Join(folder, "manager.cfg")
managerCfg, err := config.PatchJSON(checkout.ManagerConfig, map[string]interface{}{
"name": mgrName,
"workdir": workdir,
"syzkaller": checkout.Path,
})
if err != nil {
return nil, fmt.Errorf("failed to patch mgr config")
}
err = osutil.WriteFile(cfgFile, managerCfg)
if err != nil {
return nil, fmt.Errorf("failed to save manager config to %s: %s", cfgFile, err)
}
return &SyzkallerInfo{
Workdir: workdir,
CfgFile: cfgFile,
BenchFile: filepath.Join(folder, "bench.txt"),
}, nil
}
func (t *SyzManagerTarget) newSyzManagerInstance(slotName, uniqName string, checkout *Checkout) (Instance, error) {
folder := filepath.Join(checkout.Path, fmt.Sprintf("run-%s", uniqName))
common, err := SetupSyzkallerInstance(slotName, folder, checkout)
if err != nil {
return nil, err
}
if t.config.Corpus != "" {
log.Printf("[%s] Copying corpus", uniqName)
corpusPath := filepath.Join(common.Workdir, "corpus.db")
err = osutil.CopyFile(t.config.Corpus, corpusPath)
if err != nil {
return nil, fmt.Errorf("failed to copy corpus from %s: %s", t.config.Corpus, err)
}
}
return &SyzManagerInstance{
InstanceCommon: InstanceCommon{
Name: uniqName,
LogFile: filepath.Join(folder, "log.txt"),
ExecCommand: filepath.Join(checkout.Path, "bin", "syz-manager"),
ExecCommandArgs: []string{"-config", common.CfgFile, "-bench", common.BenchFile},
stopChannel: make(chan bool, 1),
},
SyzkallerInfo: *common,
RunTime: t.config.RunTime.Duration,
}, nil
}
type SyzReproInstance struct {
InstanceCommon
SyzkallerInfo
Input *SyzReproInput
ReproFile string
CReproFile string
TitleFile string
}
func (inst *SyzReproInstance) FetchResult() (RunResult, error) {
result := &SyzReproResult{
Input: inst.Input,
ReproFound: osutil.IsExist(inst.ReproFile),
CReproFound: osutil.IsExist(inst.CReproFile),
Duration: inst.Uptime(),
}
outTitle, _ := ioutil.ReadFile(inst.TitleFile)
if outTitle != nil {
result.ReproTitle = strings.TrimSpace(string(outTitle))
if result.ReproTitle != inst.Input.origTitle {
// If we found a different bug, treat the reproduction as unsuccessful.
result.ReproFound = false
result.CReproFound = false
}
}
return result, nil
}
func (t *SyzReproTarget) newSyzReproInstance(slotName, uniqName string, input *SyzReproInput,
checkout *Checkout) (Instance, error) {
folder := filepath.Join(checkout.Path, fmt.Sprintf("run-%s", uniqName))
common, err := SetupSyzkallerInstance(slotName, folder, checkout)
if err != nil {
return nil, err
}
reproFile := filepath.Join(folder, "repro.txt")
cReproFile := filepath.Join(folder, "crepro.txt")
titleFile := filepath.Join(folder, "title.txt")
newExecLog := filepath.Join(folder, "execution-log.txt")
err = osutil.CopyFile(input.Path, newExecLog)
if err != nil {
return nil, err
}
return &SyzReproInstance{
InstanceCommon: InstanceCommon{
Name: uniqName,
LogFile: filepath.Join(folder, "log.txt"),
ExecCommand: filepath.Join(checkout.Path, "bin", "syz-repro"),
ExecCommandArgs: []string{
"-config", common.CfgFile,
"-output", reproFile,
"-crepro", cReproFile,
"-title", titleFile,
newExecLog,
},
stopChannel: make(chan bool, 1),
},
SyzkallerInfo: *common,
Input: input,
ReproFile: reproFile,
CReproFile: cReproFile,
TitleFile: titleFile,
}, nil
}
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