syz-fuzzer: fix "all system calls are disabled" handling

Currently we don't fill enabled/disabled calls when we return
"all system calls are disabled" error. As the result manager
does not print any explanation for the error.
Fill in enabled/disabled calls when all calls are disabled.

2 files changed, 9 insertions, 8 deletions

diff --git a/syz-fuzzer/fuzzer.go b/syz-fuzzer/fuzzer.go
index b96938091..28d2e849c 100644
--- a/syz-fuzzer/fuzzer.go
+++ b/syz-fuzzer/fuzzer.go
@@ -163,9 +163,10 @@ func main() {
 		checkArgs.allSandboxes = r.AllSandboxes
 		r.CheckResult, err = checkMachine(checkArgs)
 		if err != nil {
-			r.CheckResult = &rpctype.CheckArgs{
-				Error: err.Error(),
+			if r.CheckResult == nil {
+				r.CheckResult = new(rpctype.CheckArgs)
 			}
+			r.CheckResult.Error = err.Error()
 		}
 		r.CheckResult.Name = *flagName
 		if err := manager.Call("Manager.Check", r.CheckResult, nil); err != nil {
diff --git a/syz-fuzzer/testing.go b/syz-fuzzer/testing.go
index c193e313a..b2bb3615b 100644
--- a/syz-fuzzer/testing.go
+++ b/syz-fuzzer/testing.go
@@ -160,11 +160,11 @@ func checkMachine(args *checkArgs) (*rpctype.CheckArgs, error) {
 	}
 	for _, sandbox := range sandboxes {
 		enabledCalls, disabledCalls, err := buildCallList(args.target, args.enabledCalls, sandbox)
-		if err != nil {
-			return nil, err
-		}
 		res.EnabledCalls[sandbox] = enabledCalls
 		res.DisabledCalls[sandbox] = disabledCalls
+		if err != nil {
+			return res, err
+		}
 	}
 	if args.allSandboxes {
 		var enabled []int
@@ -291,11 +291,11 @@ func buildCallList(target *prog.Target, enabledCalls []int, sandbox string) (
 			delete(calls, c)
 		}
 	}
-	if len(calls) == 0 {
-		return nil, nil, fmt.Errorf("all system calls are disabled")
-	}
 	for c := range calls {
 		enabled = append(enabled, c.ID)
 	}
+	if len(calls) == 0 {
+		return enabled, disabled, fmt.Errorf("all system calls are disabled")
+	}
 	return enabled, disabled, nil
 }