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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.
package main
import (
"context"
"flag"
"fmt"
"os"
"path/filepath"
"github.com/google/syzkaller/pkg/csource"
"github.com/google/syzkaller/pkg/flatrpc"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/mgrconfig"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/pkg/report"
"github.com/google/syzkaller/pkg/repro"
"github.com/google/syzkaller/vm"
)
var (
flagConfig = flag.String("config", "", "manager configuration file (manager.cfg)")
flagCount = flag.Int("count", 0, "number of VMs to use (overrides config count param)")
flagDebug = flag.Bool("debug", false, "print debug output")
flagOutput = flag.String("output", filepath.Join(".", "repro.txt"), "output syz repro file (repro.txt)")
flagCRepro = flag.String("crepro", filepath.Join(".", "repro.c"), "output c file (repro.c)")
flagTitle = flag.String("title", "", "where to save the title of the reproduced bug")
flagStrace = flag.String("strace", "", "output strace log (strace_bin must be set)")
)
func main() {
os.Args = append(append([]string{}, os.Args[0], "-vv=10"), os.Args[1:]...)
flag.Parse()
if len(flag.Args()) != 1 || *flagConfig == "" {
log.Fatalf("usage: syz-repro -config=manager.cfg execution.log")
}
cfg, err := mgrconfig.LoadFile(*flagConfig)
if err != nil {
log.Fatalf("%v: %v", *flagConfig, err)
}
logFile := flag.Args()[0]
data, err := os.ReadFile(logFile)
if err != nil {
log.Fatalf("failed to open log file %v: %v", logFile, err)
}
vmPool, err := vm.Create(cfg, *flagDebug)
if err != nil {
log.Fatalf("%v", err)
}
defer vmPool.Close()
reporter, err := report.NewReporter(cfg)
if err != nil {
log.Fatalf("%v", err)
}
osutil.HandleInterrupts(vm.Shutdown)
count := vmPool.Count()
if *flagCount > 0 {
count = *flagCount
}
pool := vm.NewDispatcher(vmPool, nil)
pool.ReserveForRun(count)
ctx, done := context.WithCancel(context.Background())
go func() {
defer done()
res, stats, err := repro.Run(ctx, data, repro.Environment{
Config: cfg,
Features: flatrpc.AllFeatures,
Reporter: reporter,
Pool: pool,
})
if err != nil {
log.Logf(0, "reproduction failed: %v", err)
}
if stats != nil {
fmt.Printf("extracting prog: %v\n", stats.ExtractProgTime)
fmt.Printf("minimizing prog: %v\n", stats.MinimizeProgTime)
fmt.Printf("simplifying prog options: %v\n", stats.SimplifyProgTime)
fmt.Printf("extracting C: %v\n", stats.ExtractCTime)
fmt.Printf("simplifying C: %v\n", stats.SimplifyCTime)
}
if res == nil {
return
}
fmt.Printf("opts: %+v crepro: %v\n\n", res.Opts, res.CRepro)
progSerialized := res.Prog.Serialize()
fmt.Printf("%s\n", progSerialized)
if err = osutil.WriteFile(*flagOutput, progSerialized); err == nil {
fmt.Printf("program saved to %s\n", *flagOutput)
} else {
log.Logf(0, "failed to write prog to file: %v", err)
}
if res.Report != nil && *flagTitle != "" {
recordTitle(res, *flagTitle)
}
if res.CRepro {
recordCRepro(res, *flagCRepro)
}
if *flagStrace != "" {
result := repro.RunStrace(res, cfg, reporter, pool)
recordStraceResult(result, *flagStrace)
}
}()
pool.Loop(ctx)
}
func recordTitle(res *repro.Result, fileName string) {
if err := osutil.WriteFile(fileName, []byte(res.Report.Title)); err == nil {
fmt.Printf("bug title saved to %s\n", *flagTitle)
} else {
log.Logf(0, "failed to write bug title to file: %v", err)
}
}
func recordCRepro(res *repro.Result, fileName string) {
src, err := csource.Write(res.Prog, res.Opts)
if err != nil {
log.Fatalf("failed to generate C repro: %v", err)
}
if formatted, err := csource.Format(src); err == nil {
src = formatted
}
fmt.Printf("%s\n", src)
if err := osutil.WriteFile(fileName, src); err == nil {
fmt.Printf("C file saved to %s\n", *flagCRepro)
} else {
log.Logf(0, "failed to write C repro to file: %v", err)
}
}
func recordStraceResult(result *repro.StraceResult, fileName string) {
if result.Error != nil {
log.Logf(0, "failed to run strace: %v", result.Error)
return
}
if result.Report != nil {
log.Logf(0, "under strace repro crashed with title: %s", result.Report.Title)
} else {
log.Logf(0, "repro didn't crash under strace")
}
if err := osutil.WriteFile(fileName, result.Output); err == nil {
fmt.Printf("C file saved to %s\n", *flagStrace)
} else {
log.Logf(0, "failed to write strace output to file: %v", err)
}
}
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