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// Copyright 2017 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 csource
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/google/syzkaller/pkg/mgrconfig"
)
// Options control various aspects of source generation.
// Dashboard also provides serialized Options along with syzkaller reproducers.
type Options struct {
Threaded bool `json:"threaded,omitempty"`
Collide bool `json:"collide,omitempty"`
Repeat bool `json:"repeat,omitempty"`
RepeatTimes int `json:"repeat_times,omitempty"` // if non-0, repeat that many times
Procs int `json:"procs"`
Sandbox string `json:"sandbox"`
Fault bool `json:"fault,omitempty"` // inject fault into FaultCall/FaultNth
FaultCall int `json:"fault_call,omitempty"`
FaultNth int `json:"fault_nth,omitempty"`
// These options allow for a more fine-tuned control over the generated C code.
EnableTun bool `json:"tun,omitempty"`
UseTmpDir bool `json:"tmpdir,omitempty"`
EnableCgroups bool `json:"cgroups,omitempty"`
EnableNetdev bool `json:"netdev,omitempty"`
ResetNet bool `json:"resetnet,omitempty"`
HandleSegv bool `json:"segv,omitempty"`
// Generate code for use with repro package to prints log messages,
// which allows to detect hangs.
Repro bool `json:"repro,omitempty"`
Trace bool `json:"trace,omitempty"`
}
// Check checks if the opts combination is valid or not.
// For example, Collide without Threaded is not valid.
// Invalid combinations must not be passed to Write.
func (opts Options) Check(OS string) error {
switch opts.Sandbox {
case "", sandboxNone, sandboxNamespace, sandboxSetuid, sandboxAndroidUntrustedApp:
default:
return fmt.Errorf("unknown sandbox %v", opts.Sandbox)
}
if !opts.Threaded && opts.Collide {
// Collide requires threaded.
return errors.New("Collide without Threaded")
}
if !opts.Repeat {
if opts.Procs > 1 {
// This does not affect generated code.
return errors.New("Procs>1 without Repeat")
}
if opts.ResetNet {
return errors.New("ResetNet without Repeat")
}
if opts.RepeatTimes > 1 {
return errors.New("RepeatTimes without Repeat")
}
}
if opts.Sandbox == "" {
if opts.EnableTun {
return errors.New("EnableTun without sandbox")
}
if opts.EnableCgroups {
return errors.New("EnableCgroups without sandbox")
}
if opts.EnableNetdev {
return errors.New("EnableNetdev without sandbox")
}
}
if opts.Sandbox == sandboxNamespace && !opts.UseTmpDir {
// This is borken and never worked.
// This tries to create syz-tmp dir in cwd,
// which will fail if procs>1 and on second run of the program.
return errors.New("Sandbox=namespace without UseTmpDir")
}
if opts.EnableCgroups && !opts.UseTmpDir {
return errors.New("EnableCgroups without UseTmpDir")
}
if opts.ResetNet && (opts.Sandbox == "" || opts.Sandbox == sandboxSetuid) {
return errors.New("ResetNet without sandbox")
}
return opts.checkLinuxOnly(OS)
}
func (opts Options) checkLinuxOnly(OS string) error {
if OS == linux {
return nil
}
if opts.EnableTun && !(OS == "openbsd" || OS == "freebsd") {
return fmt.Errorf("EnableTun is not supported on %v", OS)
}
if opts.EnableCgroups {
return fmt.Errorf("EnableCgroups is not supported on %v", OS)
}
if opts.EnableNetdev {
return fmt.Errorf("EnableNetdev is not supported on %v", OS)
}
if opts.ResetNet {
return fmt.Errorf("ResetNet is not supported on %v", OS)
}
if opts.Sandbox == sandboxNamespace ||
(opts.Sandbox == sandboxSetuid && !(OS == "openbsd" || OS == "freebsd")) ||
opts.Sandbox == sandboxAndroidUntrustedApp {
return fmt.Errorf("Sandbox=%v is not supported on %v", opts.Sandbox, OS)
}
if opts.Fault {
return fmt.Errorf("Fault is not supported on %v", OS)
}
return nil
}
func DefaultOpts(cfg *mgrconfig.Config) Options {
opts := Options{
Threaded: true,
Collide: true,
Repeat: true,
Procs: cfg.Procs,
Sandbox: cfg.Sandbox,
EnableTun: true,
EnableCgroups: true,
EnableNetdev: true,
ResetNet: true,
UseTmpDir: true,
HandleSegv: true,
Repro: true,
}
if cfg.TargetOS != linux {
opts.EnableTun = false
opts.EnableCgroups = false
opts.EnableNetdev = false
opts.ResetNet = false
}
if cfg.Sandbox == "" || cfg.Sandbox == "setuid" {
opts.ResetNet = false
}
if err := opts.Check(cfg.TargetOS); err != nil {
panic(fmt.Sprintf("DefaultOpts created bad opts: %v", err))
}
return opts
}
func (opts Options) Serialize() []byte {
data, err := json.Marshal(opts)
if err != nil {
panic(err)
}
return data
}
func DeserializeOptions(data []byte) (Options, error) {
var opts Options
if err := json.Unmarshal(data, &opts); err == nil {
return opts, nil
}
// Support for legacy formats.
data = bytes.Replace(data, []byte("Sandbox: "), []byte("Sandbox:empty "), -1)
waitRepeat, debug := false, false
n, err := fmt.Sscanf(string(data),
"{Threaded:%t Collide:%t Repeat:%t Procs:%d Sandbox:%s"+
" Fault:%t FaultCall:%d FaultNth:%d EnableTun:%t UseTmpDir:%t"+
" HandleSegv:%t WaitRepeat:%t Debug:%t Repro:%t}",
&opts.Threaded, &opts.Collide, &opts.Repeat, &opts.Procs, &opts.Sandbox,
&opts.Fault, &opts.FaultCall, &opts.FaultNth, &opts.EnableTun, &opts.UseTmpDir,
&opts.HandleSegv, &waitRepeat, &debug, &opts.Repro)
if err == nil {
if want := 14; n != want {
return opts, fmt.Errorf("failed to parse repro options: got %v fields, want %v", n, want)
}
if opts.Sandbox == "empty" {
opts.Sandbox = ""
}
return opts, nil
}
n, err = fmt.Sscanf(string(data),
"{Threaded:%t Collide:%t Repeat:%t Procs:%d Sandbox:%s"+
" Fault:%t FaultCall:%d FaultNth:%d EnableTun:%t UseTmpDir:%t"+
" EnableCgroups:%t HandleSegv:%t WaitRepeat:%t Debug:%t Repro:%t}",
&opts.Threaded, &opts.Collide, &opts.Repeat, &opts.Procs, &opts.Sandbox,
&opts.Fault, &opts.FaultCall, &opts.FaultNth, &opts.EnableTun, &opts.UseTmpDir,
&opts.EnableCgroups, &opts.HandleSegv, &waitRepeat, &debug, &opts.Repro)
if err == nil {
if want := 15; n != want {
return opts, fmt.Errorf("failed to parse repro options: got %v fields, want %v", n, want)
}
if opts.Sandbox == "empty" {
opts.Sandbox = ""
}
return opts, nil
}
return opts, err
}
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