From 1f693e021993b9ce686952f9f28475684767c458 Mon Sep 17 00:00:00 2001
From: Dmitry Vyukov <dvyukov@google.com>
Date: Sat, 17 Feb 2018 17:31:53 +0100
Subject: tools/syz-mutate: allow limiting set of syscalls

---
 tools/syz-mutate/mutate.go | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

(limited to 'tools/syz-mutate')

diff --git a/tools/syz-mutate/mutate.go b/tools/syz-mutate/mutate.go
index 3515a663e..4cf3401bc 100644
--- a/tools/syz-mutate/mutate.go
+++ b/tools/syz-mutate/mutate.go
@@ -11,16 +11,20 @@ import (
 	"math/rand"
 	"os"
 	"runtime"
+	"strings"
 	"time"
 
 	"github.com/google/syzkaller/prog"
 	_ "github.com/google/syzkaller/sys"
+	"github.com/google/syzkaller/syz-manager/mgrconfig"
 )
 
 var (
-	flagOS   = flag.String("os", runtime.GOOS, "target os")
-	flagArch = flag.String("arch", runtime.GOARCH, "target arch")
-	flagSeed = flag.Int("seed", -1, "prng seed")
+	flagOS     = flag.String("os", runtime.GOOS, "target os")
+	flagArch   = flag.String("arch", runtime.GOARCH, "target arch")
+	flagSeed   = flag.Int("seed", -1, "prng seed")
+	flagLen    = flag.Int("len", 30, "number of calls in programs")
+	flagEnable = flag.String("enable", "", "comma-separated list of enabled syscalls")
 )
 
 func main() {
@@ -30,16 +34,35 @@ func main() {
 		fmt.Fprintf(os.Stderr, "%v", err)
 		os.Exit(1)
 	}
+	var syscalls map[*prog.Syscall]bool
+	if *flagEnable != "" {
+		syscallsIDs, err := mgrconfig.ParseEnabledSyscalls(target, strings.Split(*flagEnable, ","), nil)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "failed to parse enabled syscalls: %v", err)
+			os.Exit(1)
+		}
+		syscalls = make(map[*prog.Syscall]bool)
+		for id := range syscallsIDs {
+			syscalls[target.Syscalls[id]] = true
+		}
+		trans := target.TransitivelyEnabledCalls(syscalls)
+		for c := range syscalls {
+			if !trans[c] {
+				fmt.Fprintf(os.Stderr, "disabling %v\n", c.Name)
+				delete(syscalls, c)
+			}
+		}
+	}
 	seed := time.Now().UnixNano()
 	if *flagSeed != -1 {
 		seed = int64(*flagSeed)
 	}
 	rs := rand.NewSource(seed)
 	prios := target.CalculatePriorities(nil)
-	ct := target.BuildChoiceTable(prios, nil)
+	ct := target.BuildChoiceTable(prios, syscalls)
 	var p *prog.Prog
 	if flag.NArg() == 0 {
-		p = target.Generate(rs, 20, ct)
+		p = target.Generate(rs, *flagLen, ct)
 	} else {
 		data, err := ioutil.ReadFile(flag.Arg(0))
 		if err != nil {
@@ -51,7 +74,7 @@ func main() {
 			fmt.Fprintf(os.Stderr, "failed to deserialize the program: %v\n", err)
 			os.Exit(1)
 		}
-		p.Mutate(rs, len(p.Calls)+10, ct, nil)
+		p.Mutate(rs, *flagLen, ct, nil)
 	}
 	fmt.Printf("%s\n", p.Serialize())
 }
-- 
cgit mrf-deployment