tools/syz-symbolize: Store crash report if outdir is given

We want to check if the original crash reproducer was generated is
reproduced. We need to generate syzkaller style crash report on
reproducer log and check if hash matches with the original hash.
This patch adds outdir flags to syz-symbolize and stores crashes found
from given log into it.

1 files changed, 29 insertions, 0 deletions

diff --git a/tools/syz-symbolize/symbolize.go b/tools/syz-symbolize/symbolize.go
index 5f88e68cd..299531ced 100644
--- a/tools/syz-symbolize/symbolize.go
+++ b/tools/syz-symbolize/symbolize.go
@@ -8,9 +8,12 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"runtime"
 
+	"github.com/google/syzkaller/pkg/hash"
 	"github.com/google/syzkaller/pkg/mgrconfig"
+	"github.com/google/syzkaller/pkg/osutil"
 	"github.com/google/syzkaller/pkg/report"
 )
 
@@ -19,6 +22,7 @@ var (
 	flagArch      = flag.String("arch", runtime.GOARCH, "target arch")
 	flagKernelObj = flag.String("kernel_obj", ".", "path to kernel build/obj dir")
 	flagKernelSrc = flag.String("kernel_src", "", "path to kernel sources (defaults to kernel_obj)")
+	flagOutDir    = flag.String("outdir", "", "output directory")
 )
 
 func main() {
@@ -49,6 +53,8 @@ func main() {
 	rep := reporter.Parse(text)
 	if rep == nil {
 		rep = &report.Report{Report: text}
+	} else if *flagOutDir != "" {
+		saveCrash(rep, *flagOutDir)
 	}
 	if err := reporter.Symbolize(rep); err != nil {
 		fmt.Fprintf(os.Stderr, "failed to symbolize report: %v\n", err)
@@ -60,3 +66,26 @@ func main() {
 	fmt.Printf("\n")
 	os.Stdout.Write(rep.Report)
 }
+
+func saveCrash(rep *report.Report, path string) {
+	sig := hash.Hash([]byte(rep.Title))
+	id := sig.String()
+	dir := filepath.Join(path, id)
+	osutil.MkdirAll(dir)
+	if err := osutil.WriteFile(filepath.Join(dir, "description"), []byte(rep.Title+"\n")); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to write description: %v", err)
+		os.Exit(1)
+	}
+
+	if err := osutil.WriteFile(filepath.Join(dir, "log"), rep.Output); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to write log: %v", err)
+		os.Exit(1)
+	}
+
+	if len(rep.Report) > 0 {
+		if err := osutil.WriteFile(filepath.Join(dir, "report"), rep.Report); err != nil {
+			fmt.Fprintf(os.Stderr, "failed to write report: %v", err)
+			os.Exit(1)
+		}
+	}
+}