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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"
"strconv"
"strings"
"time"
"github.com/google/syzkaller/hash"
. "github.com/google/syzkaller/log"
"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 map[hash.Sig]*Input
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 map[hash.Sig]bool
}
// Input holds info about a single corpus program.
type Input struct {
seq uint64
prog []byte
}
// Make creates State and initializes it from dir.
func Make(dir string) (*State, error) {
st := &State{
dir: dir,
Corpus: make(map[hash.Sig]*Input),
Managers: make(map[string]*Manager),
}
corpusDir := filepath.Join(st.dir, "corpus")
os.MkdirAll(corpusDir, 0700)
inputs, err := ioutil.ReadDir(corpusDir)
if err != nil {
return nil, fmt.Errorf("failed to read %v dir: %v", corpusDir, err)
}
for _, inp := range inputs {
data, err := ioutil.ReadFile(filepath.Join(corpusDir, inp.Name()))
if err != nil {
return nil, err
}
if _, err := prog.CallSet(data); err != nil {
return nil, err
}
parts := strings.Split(inp.Name(), "-")
if len(parts) != 2 {
return nil, fmt.Errorf("bad file in corpus: %v", inp.Name())
}
seq, err := strconv.ParseUint(parts[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("bad file in corpus: %v", inp.Name())
}
sig := hash.Hash(data)
if sig.String() != parts[0] {
return nil, fmt.Errorf("bad file in corpus: %v, want hash %v", inp.Name(), sig.String())
}
st.Corpus[sig] = &Input{
seq: seq,
prog: data,
}
if st.seq < seq {
st.seq = seq
}
}
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
}
mgr.Corpus = make(map[hash.Sig]bool)
corpusDir := filepath.Join(mgr.dir, "corpus")
os.MkdirAll(corpusDir, 0700)
corpus, err := ioutil.ReadDir(corpusDir)
if err != nil {
return nil, fmt.Errorf("failed to read %v dir: %v", corpusDir, err)
}
for _, input := range corpus {
sig, err := hash.FromString(input.Name())
if err != nil {
return nil, fmt.Errorf("bad file in corpus: %v", input.Name())
}
mgr.Corpus[sig] = true
}
}
return st, err
}
func (st *State) Connect(name string, fresh bool, calls []string, corpus [][]byte) error {
st.seq++
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{}{}
}
corpusDir := filepath.Join(mgr.dir, "corpus")
os.RemoveAll(corpusDir)
os.MkdirAll(corpusDir, 0700)
mgr.Corpus = make(map[hash.Sig]bool)
for _, prog := range corpus {
st.addInput(mgr, prog)
}
st.purgeCorpus()
return nil
}
func (st *State) Sync(name string, add [][]byte, del []string) ([][]byte, error) {
mgr := st.Managers[name]
if mgr == nil || mgr.Connected.IsZero() {
return nil, fmt.Errorf("unconnected manager %v", name)
}
if len(del) != 0 {
for _, h := range del {
sig, err := hash.FromString(h)
if err != nil {
Logf(0, "manager %v: bad hash: %v", h)
continue
}
delete(mgr.Corpus, sig)
}
st.purgeCorpus()
}
if len(add) != 0 {
st.seq++
for _, prog := range add {
st.addInput(mgr, prog)
}
}
inputs, err := st.pendingInputs(mgr)
mgr.Added += len(add)
mgr.Deleted += len(del)
mgr.New += len(inputs)
return inputs, err
}
func (st *State) pendingInputs(mgr *Manager) ([][]byte, error) {
if mgr.seq == st.seq {
return nil, nil
}
var inputs [][]byte
for sig, inp := range st.Corpus {
if mgr.seq > inp.seq || mgr.Corpus[sig] {
continue
}
calls, err := prog.CallSet(inp.prog)
if err != nil {
return nil, fmt.Errorf("failed to extract call set: %v\nprogram: %v", err, string(inp.prog))
}
if !managerSupportsAllCalls(mgr.Calls, calls) {
continue
}
inputs = append(inputs, inp.prog)
}
mgr.seq = st.seq
writeFile(filepath.Join(mgr.dir, "seq"), []byte(fmt.Sprint(mgr.seq)))
return inputs, nil
}
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.Hash(input)
mgr.Corpus[sig] = true
fname := filepath.Join(mgr.dir, "corpus", sig.String())
writeFile(fname, nil)
if st.Corpus[sig] == nil {
st.Corpus[sig] = &Input{
seq: st.seq,
prog: input,
}
fname := filepath.Join(st.dir, "corpus", fmt.Sprintf("%v-%v", sig.String(), st.seq))
writeFile(fname, input)
}
}
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[hash.Sig]bool)
for _, mgr := range st.Managers {
for sig := range mgr.Corpus {
used[sig] = true
}
}
for sig, inp := range st.Corpus {
if used[sig] {
continue
}
delete(st.Corpus, sig)
os.Remove(filepath.Join(st.dir, "corpus", fmt.Sprintf("%v-%v", sig.String(), inp.seq)))
}
}
func managerSupportsAllCalls(mgr, prog map[string]struct{}) bool {
for c := range prog {
if _, ok := mgr[c]; !ok {
return false
}
}
return true
}
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