/
state.go
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/
state.go
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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"
"os"
"path/filepath"
"sort"
"strconv"
"time"
"github.com/google/syzkaller/pkg/db"
"github.com/google/syzkaller/pkg/hash"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/rpctype"
"github.com/google/syzkaller/prog"
)
// State holds all internal syz-hub state including corpus,
// reproducers and information about managers.
// It is persisted to and can be restored from a directory.
type State struct {
corpusSeq uint64
reproSeq uint64
dir string
Corpus *db.DB
Repros *db.DB
Managers map[string]*Manager
}
// Manager represents one syz-manager instance.
type Manager struct {
name string
Domain string
corpusSeq uint64
reproSeq uint64
corpusFile string
corpusSeqFile string
reproSeqFile string
domainFile string
ownRepros map[string]bool
Connected time.Time
Added int
Deleted int
New int
SentRepros int
RecvRepros 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),
}
osutil.MkdirAll(st.dir)
var err error
st.Corpus, st.corpusSeq, err = loadDB(filepath.Join(st.dir, "corpus.db"), "corpus", true)
if err != nil {
log.Fatal(err)
}
st.Repros, st.reproSeq, err = loadDB(filepath.Join(st.dir, "repro.db"), "repro", true)
if err != nil {
log.Fatal(err)
}
managersDir := filepath.Join(st.dir, "manager")
osutil.MkdirAll(managersDir)
managers, err := os.ReadDir(managersDir)
if err != nil {
return nil, fmt.Errorf("failed to read %v dir: %w", managersDir, err)
}
for _, manager := range managers {
_, err := st.createManager(manager.Name())
if err != nil {
return nil, err
}
}
log.Logf(0, "purging corpus...")
st.purgeCorpus()
log.Logf(0, "done, %v programs", len(st.Corpus.Records))
return st, err
}
func (st *State) Flush() {
if err := st.Corpus.Flush(); err != nil {
log.Logf(0, "failed to flush corpus database: %v", err)
}
for _, mgr := range st.Managers {
if err := mgr.Corpus.Flush(); err != nil {
log.Logf(0, "failed to flush corpus database: %v", err)
}
}
}
func loadDB(file, name string, progs bool) (*db.DB, uint64, error) {
log.Logf(0, "reading %v...", name)
db, err := db.Open(file, true)
if err != nil {
return nil, 0, fmt.Errorf("failed to open %v database: %w", name, err)
}
log.Logf(0, "read %v programs", len(db.Records))
var maxSeq uint64
for key, rec := range db.Records {
if progs {
_, ncalls, err := prog.CallSet(rec.Val)
if err != nil {
log.Logf(0, "bad file: can't parse call set: %v\n%q", err, rec.Val)
db.Delete(key)
continue
}
if ncalls > prog.MaxCalls {
log.Logf(0, "bad file: too many calls: %v", ncalls)
db.Delete(key)
continue
}
if sig := hash.Hash(rec.Val); sig.String() != key {
log.Logf(0, "bad file: hash %v, want hash %v", key, sig.String())
db.Delete(key)
continue
}
}
if maxSeq < rec.Seq {
maxSeq = rec.Seq
}
}
if err := db.Flush(); err != nil {
return nil, 0, fmt.Errorf("failed to flush corpus database: %w", err)
}
return db, maxSeq, nil
}
func (st *State) createManager(name string) (*Manager, error) {
dir := filepath.Join(st.dir, "manager", name)
osutil.MkdirAll(dir)
mgr := &Manager{
name: name,
corpusFile: filepath.Join(dir, "corpus.db"),
corpusSeqFile: filepath.Join(dir, "seq"),
reproSeqFile: filepath.Join(dir, "repro.seq"),
domainFile: filepath.Join(dir, "domain"),
ownRepros: make(map[string]bool),
}
mgr.corpusSeq = loadSeqFile(mgr.corpusSeqFile)
if st.corpusSeq < mgr.corpusSeq {
st.corpusSeq = mgr.corpusSeq
}
mgr.reproSeq = loadSeqFile(mgr.reproSeqFile)
if mgr.reproSeq == 0 {
mgr.reproSeq = st.reproSeq
}
if st.reproSeq < mgr.reproSeq {
st.reproSeq = mgr.reproSeq
}
domainData, _ := os.ReadFile(mgr.domainFile)
mgr.Domain = string(domainData)
corpus, _, err := loadDB(mgr.corpusFile, name, false)
if err != nil {
return nil, fmt.Errorf("failed to open manager corpus %v: %w", mgr.corpusFile, err)
}
mgr.Corpus = corpus
log.Logf(0, "created manager %v: domain=%v corpus=%v, corpusSeq=%v, reproSeq=%v",
mgr.name, mgr.Domain, len(mgr.Corpus.Records), mgr.corpusSeq, mgr.reproSeq)
st.Managers[name] = mgr
return mgr, nil
}
func (st *State) Connect(name, domain string, fresh bool, calls []string, corpus [][]byte) error {
mgr := st.Managers[name]
if mgr == nil {
var err error
mgr, err = st.createManager(name)
if err != nil {
return err
}
}
mgr.Connected = time.Now()
mgr.Domain = domain
writeFile(mgr.domainFile, []byte(mgr.Domain))
if fresh {
mgr.corpusSeq = 0
mgr.reproSeq = st.reproSeq
}
saveSeqFile(mgr.corpusSeqFile, mgr.corpusSeq)
saveSeqFile(mgr.reproSeqFile, mgr.reproSeq)
mgr.Calls = make(map[string]struct{})
for _, c := range calls {
mgr.Calls[c] = struct{}{}
}
os.Remove(mgr.corpusFile)
var err error
mgr.Corpus, err = db.Open(mgr.corpusFile, true)
if err != nil {
log.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) (string, []rpctype.HubInput, 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 {
log.Logf(0, "failed to flush corpus database: %v", err)
}
st.purgeCorpus()
}
st.addInputs(mgr, add)
progs, more, err := st.pendingInputs(mgr)
mgr.Added += len(add)
mgr.Deleted += len(del)
mgr.New += len(progs)
return mgr.Domain, progs, more, err
}
func (st *State) AddRepro(name string, repro []byte) error {
mgr := st.Managers[name]
if mgr == nil || mgr.Connected.IsZero() {
return fmt.Errorf("unconnected manager %v", name)
}
if _, _, err := prog.CallSet(repro); err != nil {
log.Logf(0, "manager %v: failed to extract call set: %v, program:\n%v",
mgr.name, err, string(repro))
return nil
}
sig := hash.String(repro)
if _, ok := st.Repros.Records[sig]; ok {
return nil
}
mgr.ownRepros[sig] = true
mgr.SentRepros++
if mgr.reproSeq == st.reproSeq {
mgr.reproSeq++
saveSeqFile(mgr.reproSeqFile, mgr.reproSeq)
}
st.reproSeq++
st.Repros.Save(sig, repro, st.reproSeq)
if err := st.Repros.Flush(); err != nil {
log.Logf(0, "failed to flush repro database: %v", err)
}
return nil
}
func (st *State) PendingRepro(name string) ([]byte, error) {
mgr := st.Managers[name]
if mgr == nil || mgr.Connected.IsZero() {
return nil, fmt.Errorf("unconnected manager %v", name)
}
if mgr.reproSeq == st.reproSeq {
return nil, nil
}
var repro []byte
minSeq := ^uint64(0)
for key, rec := range st.Repros.Records {
if mgr.reproSeq >= rec.Seq {
continue
}
if mgr.ownRepros[key] {
continue
}
calls, _, err := prog.CallSet(rec.Val)
if err != nil {
return nil, fmt.Errorf("failed to extract call set: %w\nprogram: %s", err, rec.Val)
}
if !managerSupportsAllCalls(mgr.Calls, calls) {
continue
}
if minSeq > rec.Seq {
minSeq = rec.Seq
repro = rec.Val
}
}
if repro == nil {
mgr.reproSeq = st.reproSeq
saveSeqFile(mgr.reproSeqFile, mgr.reproSeq)
return nil, nil
}
mgr.RecvRepros++
mgr.reproSeq = minSeq
saveSeqFile(mgr.reproSeqFile, mgr.reproSeq)
return repro, nil
}
func (st *State) pendingInputs(mgr *Manager) ([]rpctype.HubInput, int, error) {
if mgr.corpusSeq == st.corpusSeq {
return nil, 0, nil
}
type Record struct {
Key string
Val []byte
Seq uint64
}
var records []Record
for key, rec := range st.Corpus.Records {
if mgr.corpusSeq >= 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: %w\nprogram: %s", err, rec.Val)
}
if !managerSupportsAllCalls(mgr.Calls, calls) {
continue
}
records = append(records, Record{key, rec.Val, rec.Seq})
}
maxSeq := st.corpusSeq
more := 0
const (
// Send at most that many records (rounded up to next seq number).
maxRecords = 100
// If we have way too many records to send (more than capRecords),
// cap total number to capRecords and give up sending all.
// Otherwise new managers will never chew all this on a busy hub.
capRecords = 100000
)
if len(records) > maxRecords {
sort.Slice(records, func(i, j int) bool {
return records[i].Seq < records[j].Seq
})
if len(records) > capRecords {
records = records[len(records)-capRecords:]
}
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]
}
progs := make([]rpctype.HubInput, 0, len(records))
for _, rec := range records {
progs = append(progs, rpctype.HubInput{
Domain: st.inputDomain(rec.Key, mgr.Domain),
Prog: rec.Val,
})
}
mgr.corpusSeq = maxSeq
saveSeqFile(mgr.corpusSeqFile, mgr.corpusSeq)
return progs, more, nil
}
func (st *State) inputDomain(key, self string) string {
domain := ""
for _, mgr := range st.Managers {
same := mgr.Domain == self
if !same && domain != "" {
continue
}
if _, ok := mgr.Corpus.Records[key]; !ok {
continue
}
domain = mgr.Domain
if same {
break
}
}
return domain
}
func (st *State) addInputs(mgr *Manager, inputs [][]byte) {
if len(inputs) == 0 {
return
}
st.corpusSeq++
for _, input := range inputs {
st.addInput(mgr, input)
}
if err := mgr.Corpus.Flush(); err != nil {
log.Logf(0, "failed to flush corpus database: %v", err)
}
if err := st.Corpus.Flush(); err != nil {
log.Logf(0, "failed to flush corpus database: %v", err)
}
}
func (st *State) addInput(mgr *Manager, input []byte) {
_, ncalls, err := prog.CallSet(input)
if err != nil {
log.Logf(0, "manager %v: failed to extract call set: %v, program:\n%v", mgr.name, err, string(input))
return
}
if want := prog.MaxCalls; ncalls > want {
log.Logf(0, "manager %v: too long program, ignoring (%v/%v)", mgr.name, ncalls, want)
return
}
sig := hash.String(input)
mgr.Corpus.Save(sig, nil, 0)
if _, ok := st.Corpus.Records[sig]; !ok {
st.Corpus.Save(sig, input, st.corpusSeq)
}
}
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 {
log.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
}
func writeFile(name string, data []byte) {
if err := osutil.WriteFile(name, data); err != nil {
log.Logf(0, "failed to write file %v: %v", name, err)
}
}
func saveSeqFile(filename string, seq uint64) {
writeFile(filename, []byte(fmt.Sprint(seq)))
}
func loadSeqFile(filename string) uint64 {
str, _ := os.ReadFile(filename)
seq, _ := strconv.ParseUint(string(str), 10, 64)
return seq
}