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// Copyright 2015 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.
// execprog executes a single program or a set of programs
// and optinally prints information about execution.
package main
import (
"bufio"
"bytes"
"encoding/binary"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"sync"
"sync/atomic"
"time"
"github.com/google/syzkaller/cover"
"github.com/google/syzkaller/ipc"
"github.com/google/syzkaller/prog"
)
var (
flagExecutor = flag.String("executor", "", "path to executor binary")
flagThreaded = flag.Bool("threaded", true, "use threaded mode in executor")
flagCollide = flag.Bool("collide", true, "collide syscalls to provoke data races")
flagDebug = flag.Bool("debug", false, "debug output from executor")
flagStrace = flag.Bool("strace", false, "run executor under strace")
flagCover = flag.Bool("cover", true, "collect coverage")
flagCoverFile = flag.String("coverfile", "", "write coverage to the file")
flagNobody = flag.Bool("nobody", true, "impersonate into nobody")
flagDedup = flag.Bool("dedup", false, "deduplicate coverage in executor")
flagLoop = flag.Bool("loop", false, "execute programs in a loop")
flagProcs = flag.Int("procs", 1, "number of parallel processes to execute programs")
flagTimeout = flag.Duration("timeout", 10*time.Second, "execution timeout")
)
func main() {
flag.Parse()
if len(flag.Args()) == 0 {
fmt.Fprintf(os.Stderr, "usage: execprog [flags] file-with-programs*\n")
flag.PrintDefaults()
os.Exit(1)
}
var progs []*prog.Prog
for _, fn := range flag.Args() {
progs = append(progs, parseFile(fn)...)
}
log.Printf("parsed %v programs", len(progs))
if len(progs) == 0 {
return
}
var flags uint64
if *flagThreaded {
flags |= ipc.FlagThreaded
}
if *flagCollide {
flags |= ipc.FlagCollide
}
if *flagDebug {
flags |= ipc.FlagDebug
}
if *flagStrace {
flags |= ipc.FlagStrace
}
if *flagCover || *flagCoverFile != "" {
flags |= ipc.FlagCover
}
if *flagDedup {
flags |= ipc.FlagDedupCover
}
if *flagNobody {
flags |= ipc.FlagDropPrivs
}
var wg sync.WaitGroup
wg.Add(*flagProcs)
var pos uint32
for p := 0; p < *flagProcs; p++ {
go func() {
env, err := ipc.MakeEnv(*flagExecutor, *flagTimeout, flags)
if err != nil {
log.Fatalf("failed to create ipc env: %v", err)
}
for {
idx := int(atomic.AddUint32(&pos, 1) - 1)
if idx%len(progs) == 0 {
log.Printf("executed %v programs\n", idx)
}
if !*flagLoop && idx >= len(progs) {
env.Close()
wg.Done()
return
}
p := progs[idx%len(progs)]
output, strace, cov, failed, hanged, err := env.Exec(p)
if *flagDebug || err != nil {
fmt.Printf("result: failed=%v hanged=%v err=%v\n\n%s", failed, hanged, err, output)
}
if *flagStrace {
fmt.Printf("strace output:\n%s", strace)
}
if *flagCoverFile != "" {
// Coverage is dumped in sanitizer format.
// github.com/google/sanitizers/tools/sancov command can be used to dump PCs,
// then they can be piped via addr2line to symbolize.
for i, c := range cov {
fmt.Printf("call #%v: coverage %v\n", i, len(c))
if len(c) == 0 {
continue
}
buf := new(bytes.Buffer)
binary.Write(buf, binary.LittleEndian, uint64(0xC0BFFFFFFFFFFF64))
for _, pc := range c {
binary.Write(buf, binary.LittleEndian, cover.RestorePC(pc))
}
err := ioutil.WriteFile(fmt.Sprintf("%v.%v", *flagCoverFile, i), buf.Bytes(), 0660)
if err != nil {
log.Fatalf("failed to write coverage file: %v", err)
}
}
}
}
}()
}
wg.Wait()
}
func parseFile(fn string) []*prog.Prog {
logf, err := os.Open(fn)
if err != nil {
log.Fatalf("failed to open log file: %v", err)
}
log.Printf("parsing log %v", fn)
s := bufio.NewScanner(logf)
var cur []byte
var last *prog.Prog
var progs []*prog.Prog
for s.Scan() {
ln := s.Text()
tmp := append(cur, ln...)
tmp = append(tmp, '\n')
p, err := prog.Deserialize(tmp)
if err == nil {
cur = tmp
last = p
continue
}
if last != nil {
progs = append(progs, last)
last = nil
cur = cur[:0]
}
}
if last != nil {
progs = append(progs, last)
}
return progs
}
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