csource

Documentation

Overview

Package csource generates [almost] equivalent C programs from syzkaller programs.

Index

• func Build(target *prog.Target, src []byte) (string, error)
• func BuildFile(target *prog.Target, src string) (string, error)
• func BuildNoWarn(target *prog.Target, src []byte) (string, error)
• func Format(src []byte) ([]byte, error)
• func PrintAvailableFeaturesFlags()
• func Write(p *prog.Prog, opts Options) ([]byte, error)
• type Feature
• type Features
  • func ParseFeaturesFlags(enable string, disable string, defaultValue bool) (Features, error)
• type Options
  • func DefaultOpts(cfg *mgrconfig.Config) Options
  • func DeserializeOptions(data []byte) (Options, error)
  • func (opts Options) Check(OS string) error
  • func (opts Options) Serialize() []byte

Functions

func Build

func Build(target *prog.Target, src []byte) (string, error)

Build builds a C program from source src and returns name of the resulting binary.

func BuildFile

func BuildFile(target *prog.Target, src string) (string, error)

BuildFile builds a C/C++ program from file src and returns name of the resulting binary.

func BuildNoWarn

func BuildNoWarn(target *prog.Target, src []byte) (string, error)

BuildNoWarn is the same as Build, but ignores all compilation warnings. Should not be used in tests, but may be used e.g. when we are bisecting and potentially using an old repro with newer compiler, or a compiler that we never seen before. In these cases it's more important to build successfully.

func Format

func Format(src []byte) ([]byte, error)

Format reformats C source using clang-format.

func PrintAvailableFeaturesFlags

func PrintAvailableFeaturesFlags()

func Write

func Write(p *prog.Prog, opts Options) ([]byte, error)

Types

type Feature

type Feature struct {
	Description string
	Enabled     bool
}

type Features

type Features map[string]Feature

func ParseFeaturesFlags

func ParseFeaturesFlags(enable string, disable string, defaultValue bool) (Features, error)

type Options

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"`

	Leak bool `json:"leak,omitempty"` // do leak checking

	// These options allow for a more fine-tuned control over the generated C code.
	NetInjection bool `json:"tun,omitempty"`
	NetDevices   bool `json:"netdev,omitempty"`
	NetReset     bool `json:"resetnet,omitempty"`
	Cgroups      bool `json:"cgroups,omitempty"`
	BinfmtMisc   bool `json:"binfmt_misc,omitempty"`
	CloseFDs     bool `json:"close_fds"`
	KCSAN        bool `json:"kcsan,omitempty"`
	DevlinkPCI   bool `json:"devlinkpci,omitempty"`

	UseTmpDir  bool `json:"tmpdir,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"`
}

Options control various aspects of source generation. Dashboard also provides serialized Options along with syzkaller reproducers.

func DefaultOpts

func DefaultOpts(cfg *mgrconfig.Config) Options

func DeserializeOptions

func DeserializeOptions(data []byte) (Options, error)

func (Options) Check

func (opts Options) Check(OS string) error

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 (Options) Serialize

func (opts Options) Serialize() []byte