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// Copyright 2016 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 state
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strconv"
"time"
"github.com/google/syzkaller/db"
. "github.com/google/syzkaller/log"
"github.com/google/syzkaller/pkg/hash"
"github.com/google/syzkaller/prog"
)
// State holds all internal syz-hub state including corpus and information about managers.
// It is persisted to and can be restored from a directory.
type State struct {
seq uint64
dir string
Corpus *db.DB
Managers map[string]*Manager
}
// Manager represents one syz-manager instance.
type Manager struct {
name string
seq uint64
dir string
Connected time.Time
Added int
Deleted int
New int
Calls map[string]struct{}
Corpus *db.DB
}
// Make creates State and initializes it from dir.
func Make(dir string) (*State, error) {
st := &State{
dir: dir,
Managers: make(map[string]*Manager),
}
os.MkdirAll(st.dir, 0750)
var err error
Logf(0, "reading corpus...")
st.Corpus, err = db.Open(filepath.Join(st.dir, "corpus.db"))
if err != nil {
Fatalf("failed to open corpus database: %v", err)
}
Logf(0, "read %v programs", len(st.Corpus.Records))
for key, rec := range st.Corpus.Records {
if _, err := prog.CallSet(rec.Val); err != nil {
Logf(0, "bad file in corpus: can't parse call set: %v", err)
st.Corpus.Delete(key)
continue
}
if sig := hash.Hash(rec.Val); sig.String() != key {
Logf(0, "bad file in corpus: hash %v, want hash %v", key, sig.String())
st.Corpus.Delete(key)
continue
}
if st.seq < rec.Seq {
st.seq = rec.Seq
}
}
if err := st.Corpus.Flush(); err != nil {
Fatalf("failed to flush corpus database: %v", err)
}
managersDir := filepath.Join(st.dir, "manager")
os.MkdirAll(managersDir, 0700)
managers, err := ioutil.ReadDir(managersDir)
if err != nil {
return nil, fmt.Errorf("failed to read %v dir: %v", managersDir, err)
}
for _, manager := range managers {
mgr := &Manager{
name: manager.Name(),
}
st.Managers[mgr.name] = mgr
mgr.dir = filepath.Join(managersDir, mgr.name)
seqStr, _ := ioutil.ReadFile(filepath.Join(mgr.dir, "seq"))
mgr.seq, _ = strconv.ParseUint(string(seqStr), 10, 64)
if st.seq < mgr.seq {
st.seq = mgr.seq
}
Logf(0, "reading %v corpus...", mgr.name)
mgr.Corpus, err = db.Open(filepath.Join(mgr.dir, "corpus.db"))
if err != nil {
return nil, fmt.Errorf("failed to open manager corpus database %v: %v", mgr.dir, err)
}
Logf(0, "read %v programs", len(mgr.Corpus.Records))
}
Logf(0, "purging corpus...")
st.purgeCorpus()
Logf(0, "done, %v programs", len(st.Corpus.Records))
return st, err
}
func (st *State) Connect(name string, fresh bool, calls []string, corpus [][]byte) error {
mgr := st.Managers[name]
if mgr == nil {
mgr = new(Manager)
st.Managers[name] = mgr
mgr.dir = filepath.Join(st.dir, "manager", name)
os.MkdirAll(mgr.dir, 0700)
}
mgr.Connected = time.Now()
if fresh {
mgr.seq = 0
}
writeFile(filepath.Join(mgr.dir, "seq"), []byte(fmt.Sprint(mgr.seq)))
mgr.Calls = make(map[string]struct{})
for _, c := range calls {
mgr.Calls[c] = struct{}{}
}
corpusFile := filepath.Join(mgr.dir, "corpus.db")
os.Remove(corpusFile)
var err error
mgr.Corpus, err = db.Open(corpusFile)
if err != nil {
Logf(0, "failed to open corpus database: %v", err)
return err
}
st.addInputs(mgr, corpus)
st.purgeCorpus()
return nil
}
func (st *State) Sync(name string, add [][]byte, del []string) ([][]byte, int, error) {
mgr := st.Managers[name]
if mgr == nil || mgr.Connected.IsZero() {
return nil, 0, fmt.Errorf("unconnected manager %v", name)
}
if len(del) != 0 {
for _, sig := range del {
mgr.Corpus.Delete(sig)
}
if err := mgr.Corpus.Flush(); err != nil {
Logf(0, "failed to flush corpus database: %v", err)
}
st.purgeCorpus()
}
st.addInputs(mgr, add)
inputs, more, err := st.pendingInputs(mgr)
mgr.Added += len(add)
mgr.Deleted += len(del)
mgr.New += len(inputs)
return inputs, more, err
}
func (st *State) pendingInputs(mgr *Manager) ([][]byte, int, error) {
if mgr.seq == st.seq {
return nil, 0, nil
}
var records []db.Record
for key, rec := range st.Corpus.Records {
if mgr.seq >= rec.Seq {
continue
}
if _, ok := mgr.Corpus.Records[key]; ok {
continue
}
calls, err := prog.CallSet(rec.Val)
if err != nil {
return nil, 0, fmt.Errorf("failed to extract call set: %v\nprogram: %s", err, rec.Val)
}
if !managerSupportsAllCalls(mgr.Calls, calls) {
continue
}
records = append(records, rec)
}
maxSeq := st.seq
more := 0
// Send at most that many records (rounded up to next seq number).
const maxRecords = 1000
if len(records) > maxRecords {
sort.Sort(recordSeqSorter(records))
pos := maxRecords
maxSeq = records[pos].Seq
for pos+1 < len(records) && records[pos+1].Seq == maxSeq {
pos++
}
pos++
more = len(records) - pos
records = records[:pos]
}
inputs := make([][]byte, len(records))
for i, rec := range records {
inputs[i] = rec.Val
}
mgr.seq = maxSeq
writeFile(filepath.Join(mgr.dir, "seq"), []byte(fmt.Sprint(mgr.seq)))
return inputs, more, nil
}
func (st *State) addInputs(mgr *Manager, inputs [][]byte) {
if len(inputs) == 0 {
return
}
st.seq++
for _, input := range inputs {
st.addInput(mgr, input)
}
if err := mgr.Corpus.Flush(); err != nil {
Logf(0, "failed to flush corpus database: %v", err)
}
if err := st.Corpus.Flush(); err != nil {
Logf(0, "failed to flush corpus database: %v", err)
}
}
func (st *State) addInput(mgr *Manager, input []byte) {
if _, err := prog.CallSet(input); err != nil {
Logf(0, "manager %v: failed to extract call set: %v, program:\n%v", mgr.name, err, string(input))
return
}
sig := hash.String(input)
mgr.Corpus.Save(sig, nil, 0)
if _, ok := st.Corpus.Records[sig]; !ok {
st.Corpus.Save(sig, input, st.seq)
}
}
func writeFile(name string, data []byte) {
if err := ioutil.WriteFile(name, data, 0600); err != nil {
Logf(0, "failed to write file %v: %v", name, err)
}
}
func (st *State) purgeCorpus() {
used := make(map[string]bool)
for _, mgr := range st.Managers {
for sig := range mgr.Corpus.Records {
used[sig] = true
}
}
for key := range st.Corpus.Records {
if used[key] {
continue
}
st.Corpus.Delete(key)
}
if err := st.Corpus.Flush(); err != nil {
Logf(0, "failed to flush corpus database: %v", err)
}
}
func managerSupportsAllCalls(mgr, prog map[string]struct{}) bool {
for c := range prog {
if _, ok := mgr[c]; !ok {
return false
}
}
return true
}
type recordSeqSorter []db.Record
func (a recordSeqSorter) Len() int {
return len(a)
}
func (a recordSeqSorter) Less(i, j int) bool {
return a[i].Seq < a[j].Seq
}
func (a recordSeqSorter) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
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