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// Copyright 2017 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"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"time"
"github.com/google/syzkaller/pkg/db"
"github.com/google/syzkaller/pkg/hash"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/tool"
"github.com/google/syzkaller/prog"
_ "github.com/google/syzkaller/sys"
"golang.org/x/exp/maps"
)
func main() {
var (
flagVersion = flag.Uint64("version", 0, "database version")
flagOS = flag.String("os", runtime.GOOS, "target OS")
flagArch = flag.String("arch", runtime.GOARCH, "target arch")
)
flag.Parse()
args := flag.Args()
if len(args) == 0 {
usage()
}
if args[0] == "bench" {
if len(args) != 2 {
usage()
}
target, err := prog.GetTarget(*flagOS, *flagArch)
if err != nil {
tool.Failf("failed to find target: %v", err)
}
bench(target, args[1])
return
}
var target *prog.Target
if *flagOS != "" || *flagArch != "" {
var err error
target, err = prog.GetTarget(*flagOS, *flagArch)
if err != nil {
tool.Failf("failed to find target: %v", err)
}
}
switch args[0] {
case "pack":
if len(args) != 3 {
usage()
}
pack(args[1], args[2], target, *flagVersion)
case "unpack":
if len(args) != 3 {
usage()
}
unpack(args[1], args[2])
case "merge":
if len(args) < 3 {
usage()
}
merge(args[1], args[2:], target)
case "print":
if len(args) != 2 {
usage()
}
print(args[1])
case "rm":
if len(args) != 3 {
usage()
}
rm(args[1], args[2], target)
default:
usage()
}
}
func usage() {
fmt.Fprintf(os.Stderr, `usage: syz-db can be used to manipulate corpus
databases that are used by syz-managers. The following generic arguments are
offered:
-arch string
-os string
-version uint
-vv int
they can be used for:
packing a database:
syz-db pack dir corpus.db
unpacking a database. A file containing performed syscalls will be returned:
syz-db unpack corpus.db dir
merging databases. No additional file will be created: The first file will be replaced by the merged result:
syz-db merge dst-corpus.db add-corpus.db* add-prog*
running a deserialization benchmark and printing corpus stats:
syz-db bench corpus.db
print corpus db:
syz-db print corpus.db
remove a syscall from db
syz-db rm corpus.db syscall_name
`)
os.Exit(1)
}
func pack(dir, file string, target *prog.Target, version uint64) {
files, err := os.ReadDir(dir)
if err != nil {
tool.Failf("failed to read dir: %v", err)
}
var records []db.Record
for _, file := range files {
data, err := os.ReadFile(filepath.Join(dir, file.Name()))
if err != nil {
tool.Failf("failed to read file %v: %v", file.Name(), err)
}
var seq uint64
key := file.Name()
if parts := strings.Split(file.Name(), "-"); len(parts) == 2 {
var err error
if seq, err = strconv.ParseUint(parts[1], 10, 64); err == nil {
key = parts[0]
}
}
if sig := hash.String(data); key != sig {
if target != nil {
p, err := target.Deserialize(data, prog.NonStrict)
if err != nil {
tool.Failf("failed to deserialize %v: %v", file.Name(), err)
}
data = p.Serialize()
sig = hash.String(data)
}
fmt.Fprintf(os.Stderr, "fixing hash %v -> %v\n", key, sig)
key = sig
}
records = append(records, db.Record{
Val: data,
Seq: seq,
})
}
if err := db.Create(file, version, records); err != nil {
tool.Fail(err)
}
}
func unpack(file, dir string) {
db, err := db.Open(file, false)
if err != nil {
tool.Failf("failed to open database: %v", err)
}
osutil.MkdirAll(dir)
for key, rec := range db.Records {
fname := filepath.Join(dir, key)
if rec.Seq != 0 {
fname += fmt.Sprintf("-%v", rec.Seq)
}
if err := osutil.WriteFile(fname, rec.Val); err != nil {
tool.Failf("failed to output file: %v", err)
}
}
}
func merge(file string, adds []string, target *prog.Target) {
failures, err := db.Merge(file, adds, target)
if err != nil {
tool.Failf("%s", err)
}
if len(failures) > 0 {
for _, fail := range failures {
fmt.Printf("failed to deserialize a record from %s: %s\n", fail.File, fail.Err)
}
tool.Failf("there have been deserialization errors")
}
}
func bench(target *prog.Target, file string) {
start := time.Now()
db, err := db.Open(file, false)
if err != nil {
tool.Failf("failed to open database: %v", err)
}
var corpus []*prog.Prog
for _, rec := range db.Records {
p, err := target.Deserialize(rec.Val, prog.NonStrict)
if err != nil {
tool.Failf("failed to deserialize: %v\n%s", err, rec.Val)
}
corpus = append(corpus, p)
}
runtime.GC()
var stats runtime.MemStats
runtime.ReadMemStats(&stats)
fmt.Printf("allocs %v MB (%v M), next GC %v MB, sys heap %v MB, live allocs %v MB (%v M), time %v\n",
stats.TotalAlloc>>20,
stats.Mallocs>>20,
stats.NextGC>>20,
stats.HeapSys>>20,
stats.Alloc>>20,
(stats.Mallocs-stats.Frees)>>20,
time.Since(start))
n := len(corpus)
fmt.Printf("corpus size: %v\n", n)
if n == 0 {
return
}
sum := 0
lens := make([]int, n)
for i, p := range corpus {
sum += len(p.Calls)
lens[i] = len(p.Calls)
}
sort.Ints(lens)
fmt.Printf("program size: min=%v avg=%v max=%v 10%%=%v 50%%=%v 90%%=%v\n",
lens[0], sum/n, lens[n-1], lens[n/10], lens[n/2], lens[n*9/10])
}
func print(file string) {
db, err := db.Open(file, false)
if err != nil {
tool.Failf("failed to open database: %v", err)
}
keys := maps.Keys(db.Records)
sort.Strings(keys)
for _, key := range keys {
rec := db.Records[key]
fmt.Printf("%v\n%v\n", key, string(rec.Val))
}
}
func rm(file, syscall string, target *prog.Target) {
db, err := db.Open(file, false)
if err != nil {
tool.Failf("failed to open database: %w", err)
}
for key, rec := range db.Records {
p, err := target.Deserialize(rec.Val, prog.NonStrict)
if err != nil {
tool.Failf("failed to deserialize: %w\n%s", err, rec.Val)
}
for i := len(p.Calls) - 1; i >= 0; i-- {
if strings.Contains(p.Calls[i].Meta.Name, syscall) {
p.RemoveCall(i)
}
}
data := p.Serialize()
if len(data) > 0 {
db.Save(key, data, rec.Seq)
} else {
delete(db.Records, key)
}
}
if err := db.Flush(); err != nil {
tool.Fail(err)
}
}
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