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Syzkaller
prog
randFilenameLength

How to use randFilenameLength method of prog Package

Best Syzkaller code snippet using prog.randFilenameLength

rand.go

Source:rand.go

...274			if r.oneOf(100) {275				// Make file name very long using target.SpecialFileLenghts consts.276				// Add/subtract some small const to account for our file name prefix277				// and potential kernel off-by-one's.278				fileLen := r.randFilenameLength()279				if add := fileLen - len(f); add > 0 {280					f += strings.Repeat(specialFileLenPad, add)281				}282			}283			if !s.files[f] {284				return f285			}286		}287	}288	return r.randFromMap(s.files)289}290func (r *randGen) randFilenameLength() int {291	off := r.biasedRand(10, 5)292	if r.bin() {293		off = -off294	}295	lens := r.target.SpecialFileLenghts296	res := lens[r.Intn(len(lens))] + off297	if res < 0 {298		res = 0299	}300	return res301}302func (r *randGen) randFromMap(m map[string]bool) string {303	files := make([]string, 0, len(m))304	for f := range m {305		files = append(files, f)306	}307	sort.Strings(files)308	return files[r.Intn(len(files))]309}310func (r *randGen) randString(s *state, t *BufferType) []byte {311	if len(t.Values) != 0 {312		return []byte(t.Values[r.Intn(len(t.Values))])313	}314	if len(s.strings) != 0 && r.bin() {315		// Return an existing string.316		// TODO(dvyukov): make s.strings indexed by string SubKind.317		return []byte(r.randFromMap(s.strings))318	}319	punct := []byte{'!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '+', '\\',320		'/', ':', '.', ',', '-', '\'', '[', ']', '{', '}'}321	buf := new(bytes.Buffer)322	for r.nOutOf(3, 4) {323		if r.nOutOf(10, 11) {324			buf.Write([]byte{punct[r.Intn(len(punct))]})325		} else {326			buf.Write([]byte{byte(r.Intn(256))})327		}328	}329	if r.oneOf(100) == t.NoZ {330		buf.Write([]byte{0})331	}332	return buf.Bytes()333}334func (r *randGen) allocAddr(s *state, typ Type, dir Dir, size uint64, data Arg) *PointerArg {335	return MakePointerArg(typ, dir, s.ma.alloc(r, size, data.Type().Alignment()), data)336}337func (r *randGen) allocVMA(s *state, typ Type, dir Dir, numPages uint64) *PointerArg {338	page := s.va.alloc(r, numPages)339	return MakeVmaPointerArg(typ, dir, page*r.target.PageSize, numPages*r.target.PageSize)340}341func (r *randGen) createResource(s *state, res *ResourceType, dir Dir) (Arg, []*Call) {342	if !r.inGenerateResource {343		panic("inGenerateResource is not set")344	}345	kind := res.Desc.Name346	// Find calls that produce the necessary resources.347	// TODO: reduce priority of less specialized ctors.348	metas := r.enabledCtors(s, kind)349	// We may have no resources, but still be in createResource due to ANYRES.350	if len(r.target.resourceMap) != 0 && r.oneOf(1000) {351		// Spoof resource subkind.352		var all []string353		for kind1 := range r.target.resourceMap {354			if r.target.isCompatibleResource(res.Desc.Kind[0], kind1) {355				all = append(all, kind1)356			}357		}358		if len(all) == 0 {359			panic(fmt.Sprintf("got no spoof resources for %v in %v/%v",360				kind, r.target.OS, r.target.Arch))361		}362		sort.Strings(all)363		kind1 := all[r.Intn(len(all))]364		metas1 := r.enabledCtors(s, kind1)365		if len(metas1) != 0 {366			// Don't use the resource for which we don't have any ctors.367			// It's fine per-se because below we just return nil in such case.368			// But in TestCreateResource tests we want to ensure that we don't fail369			// to create non-optional resources, and if we spoof a non-optional370			// resource with ctors with a optional resource w/o ctors, then that check will fail.371			kind, metas = kind1, metas1372		}373	}374	if len(metas) == 0 {375		// We may not have any constructors for optional input resources because we don't disable376		// syscalls based on optional inputs resources w/o ctors in TransitivelyEnabledCalls.377		return nil, nil378	}379	// Now we have a set of candidate calls that can create the necessary resource.380	// Generate one of them.381	meta := metas[r.Intn(len(metas))]382	calls := r.generateParticularCall(s, meta)383	s1 := newState(r.target, s.ct, nil)384	s1.analyze(calls[len(calls)-1])385	// Now see if we have what we want.386	var allres []*ResultArg387	for kind1, res1 := range s1.resources {388		if r.target.isCompatibleResource(kind, kind1) {389			allres = append(allres, res1...)390		}391	}392	sort.SliceStable(allres, func(i, j int) bool {393		return allres[i].Type().Name() < allres[j].Type().Name()394	})395	if len(allres) == 0 {396		panic(fmt.Sprintf("failed to create a resource %v (%v) with %v",397			res.Desc.Kind[0], kind, meta.Name))398	}399	arg := MakeResultArg(res, dir, allres[r.Intn(len(allres))], 0)400	return arg, calls401}402func (r *randGen) enabledCtors(s *state, kind string) []*Syscall {403	var metas []*Syscall404	for _, meta := range r.target.resourceCtors[kind] {405		if s.ct.Generatable(meta.ID) {406			metas = append(metas, meta)407		}408	}409	return metas410}411func (r *randGen) generateText(kind TextKind) []byte {412	switch kind {413	case TextTarget:414		if cfg := createTargetIfuzzConfig(r.target); cfg != nil {415			return ifuzz.Generate(cfg, r.Rand)416		}417		fallthrough418	case TextArm64:419		// Just a stub, need something better.420		text := make([]byte, 50)421		for i := range text {422			text[i] = byte(r.Intn(256))423		}424		return text425	default:426		cfg := createIfuzzConfig(kind)427		return ifuzz.Generate(cfg, r.Rand)428	}429}430func (r *randGen) mutateText(kind TextKind, text []byte) []byte {431	switch kind {432	case TextTarget:433		if cfg := createTargetIfuzzConfig(r.target); cfg != nil {434			return ifuzz.Mutate(cfg, r.Rand, text)435		}436		fallthrough437	case TextArm64:438		return mutateData(r, text, 40, 60)439	default:440		cfg := createIfuzzConfig(kind)441		return ifuzz.Mutate(cfg, r.Rand, text)442	}443}444func createTargetIfuzzConfig(target *Target) *ifuzz.Config {445	cfg := &ifuzz.Config{446		Len:  10,447		Priv: false,448		Exec: true,449		MemRegions: []ifuzz.MemRegion{450			{Start: target.DataOffset, Size: target.NumPages * target.PageSize},451		},452	}453	for _, p := range target.SpecialPointers {454		cfg.MemRegions = append(cfg.MemRegions, ifuzz.MemRegion{455			Start: p & ^target.PageSize, Size: p & ^target.PageSize + target.PageSize,456		})457	}458	switch target.Arch {459	case "amd64":460		cfg.Mode = ifuzz.ModeLong64461		cfg.Arch = ifuzz.ArchX86462	case "386":463		cfg.Mode = ifuzz.ModeProt32464		cfg.Arch = ifuzz.ArchX86465	case "ppc64":466		cfg.Mode = ifuzz.ModeLong64467		cfg.Arch = ifuzz.ArchPowerPC468	default:469		return nil470	}471	return cfg472}473func createIfuzzConfig(kind TextKind) *ifuzz.Config {474	cfg := &ifuzz.Config{475		Len:  10,476		Priv: true,477		Exec: true,478		MemRegions: []ifuzz.MemRegion{479			{Start: 0 << 12, Size: 1 << 12},480			{Start: 1 << 12, Size: 1 << 12},481			{Start: 2 << 12, Size: 1 << 12},482			{Start: 3 << 12, Size: 1 << 12},483			{Start: 4 << 12, Size: 1 << 12},484			{Start: 5 << 12, Size: 1 << 12},485			{Start: 6 << 12, Size: 1 << 12},486			{Start: 7 << 12, Size: 1 << 12},487			{Start: 8 << 12, Size: 1 << 12},488			{Start: 9 << 12, Size: 1 << 12},489			{Start: 0xfec00000, Size: 0x100}, // ioapic490		},491	}492	switch kind {493	case TextX86Real:494		cfg.Mode = ifuzz.ModeReal16495		cfg.Arch = ifuzz.ArchX86496	case TextX86bit16:497		cfg.Mode = ifuzz.ModeProt16498		cfg.Arch = ifuzz.ArchX86499	case TextX86bit32:500		cfg.Mode = ifuzz.ModeProt32501		cfg.Arch = ifuzz.ArchX86502	case TextX86bit64:503		cfg.Mode = ifuzz.ModeLong64504		cfg.Arch = ifuzz.ArchX86505	case TextPpc64:506		cfg.Mode = ifuzz.ModeLong64507		cfg.Arch = ifuzz.ArchPowerPC508	default:509		panic("unknown text kind")510	}511	return cfg512}513// nOutOf returns true n out of outOf times.514func (r *randGen) nOutOf(n, outOf int) bool {515	if n <= 0 || n >= outOf {516		panic("bad probability")517	}518	v := r.Intn(outOf)519	return v < n520}521func (r *randGen) generateCall(s *state, p *Prog, insertionPoint int) []*Call {522	biasCall := -1523	if insertionPoint > 0 {524		// Choosing the base call is based on the insertion point of the new calls sequence.525		insertionCall := p.Calls[r.Intn(insertionPoint)].Meta526		if !insertionCall.Attrs.NoGenerate {527			// We must be careful not to bias towards a non-generatable call.528			biasCall = insertionCall.ID529		}530	}531	idx := s.ct.choose(r.Rand, biasCall)532	meta := r.target.Syscalls[idx]533	return r.generateParticularCall(s, meta)534}535func (r *randGen) generateParticularCall(s *state, meta *Syscall) (calls []*Call) {536	if meta.Attrs.Disabled {537		panic(fmt.Sprintf("generating disabled call %v", meta.Name))538	}539	if meta.Attrs.NoGenerate {540		panic(fmt.Sprintf("generating no_generate call: %v", meta.Name))541	}542	c := MakeCall(meta, nil)543	c.Args, calls = r.generateArgs(s, meta.Args, DirIn)544	r.target.assignSizesCall(c)545	return append(calls, c)546}547// GenerateAllSyzProg generates a program that contains all pseudo syz_ calls for testing.548func (target *Target) GenerateAllSyzProg(rs rand.Source) *Prog {549	p := &Prog{550		Target: target,551	}552	r := newRand(target, rs)553	s := newState(target, target.DefaultChoiceTable(), nil)554	handled := make(map[string]bool)555	for _, meta := range target.Syscalls {556		if !strings.HasPrefix(meta.CallName, "syz_") ||557			handled[meta.CallName] ||558			meta.Attrs.Disabled ||559			meta.Attrs.NoGenerate {560			continue561		}562		handled[meta.CallName] = true563		calls := r.generateParticularCall(s, meta)564		for _, c := range calls {565			s.analyze(c)566			p.Calls = append(p.Calls, c)567		}568	}569	if err := p.validate(); err != nil {570		panic(err)571	}572	return p573}574// DataMmapProg creates program that maps data segment.575// Also used for testing as the simplest program.576func (target *Target) DataMmapProg() *Prog {577	return &Prog{578		Target: target,579		Calls:  target.MakeDataMmap(),580	}581}582func (r *randGen) generateArgs(s *state, fields []Field, dir Dir) ([]Arg, []*Call) {583	var calls []*Call584	args := make([]Arg, len(fields))585	// Generate all args. Size args have the default value 0 for now.586	for i, field := range fields {587		arg, calls1 := r.generateArg(s, field.Type, field.Dir(dir))588		if arg == nil {589			panic(fmt.Sprintf("generated arg is nil for field '%v', fields: %+v", field.Type.Name(), fields))590		}591		args[i] = arg592		calls = append(calls, calls1...)593	}594	return args, calls595}596func (r *randGen) generateArg(s *state, typ Type, dir Dir) (arg Arg, calls []*Call) {597	return r.generateArgImpl(s, typ, dir, false)598}599func (r *randGen) generateArgImpl(s *state, typ Type, dir Dir, ignoreSpecial bool) (arg Arg, calls []*Call) {600	if dir == DirOut {601		// No need to generate something interesting for output scalar arguments.602		// But we still need to generate the argument itself so that it can be referenced603		// in subsequent calls. For the same reason we do generate pointer/array/struct604		// output arguments (their elements can be referenced in subsequent calls).605		switch typ.(type) {606		case *IntType, *FlagsType, *ConstType, *ProcType, *VmaType, *ResourceType:607			return typ.DefaultArg(dir), nil608		}609	}610	if typ.Optional() && r.oneOf(5) {611		if res, ok := typ.(*ResourceType); ok {612			v := res.Desc.Values[r.Intn(len(res.Desc.Values))]613			return MakeResultArg(typ, dir, nil, v), nil614		}615		return typ.DefaultArg(dir), nil616	}617	// Allow infinite recursion for optional pointers.618	if pt, ok := typ.(*PtrType); ok && typ.Optional() {619		switch pt.Elem.(type) {620		case *StructType, *ArrayType, *UnionType:621			name := pt.Elem.Name()622			r.recDepth[name]++623			defer func() {624				r.recDepth[name]--625				if r.recDepth[name] == 0 {626					delete(r.recDepth, name)627				}628			}()629			if r.recDepth[name] >= 3 {630				return MakeSpecialPointerArg(typ, dir, 0), nil631			}632		}633	}634	if !ignoreSpecial && dir != DirOut {635		switch typ.(type) {636		case *StructType, *UnionType:637			if gen := r.target.SpecialTypes[typ.Name()]; gen != nil {638				return gen(&Gen{r, s}, typ, dir, nil)639			}640		}641	}642	return typ.generate(r, s, dir)643}644func (a *ResourceType) generate(r *randGen, s *state, dir Dir) (arg Arg, calls []*Call) {645	if !r.inGenerateResource {646		// Don't allow recursion for resourceCentric/createResource.647		// That can lead to generation of huge programs and may be very slow648		// (esp. if we are generating some failing attempts in createResource already).649		r.inGenerateResource = true650		defer func() { r.inGenerateResource = false }()651		if r.oneOf(4) {652			arg, calls = r.resourceCentric(s, a, dir)653			if arg != nil {654				return655			}656		}657		if r.oneOf(3) {658			arg, calls = r.createResource(s, a, dir)659			if arg != nil {660				return661			}662		}663	}664	if r.nOutOf(9, 10) {665		arg = r.existingResource(s, a, dir)666		if arg != nil {667			return668		}669	}670	special := a.SpecialValues()671	arg = MakeResultArg(a, dir, nil, special[r.Intn(len(special))])672	return673}674func (a *BufferType) generate(r *randGen, s *state, dir Dir) (arg Arg, calls []*Call) {675	switch a.Kind {676	case BufferBlobRand, BufferBlobRange:677		sz := r.randBufLen()678		if a.Kind == BufferBlobRange {679			sz = r.randRange(a.RangeBegin, a.RangeEnd)680		}681		if dir == DirOut {682			return MakeOutDataArg(a, dir, sz), nil683		}684		data := make([]byte, sz)685		for i := range data {686			data[i] = byte(r.Intn(256))687		}688		return MakeDataArg(a, dir, data), nil689	case BufferString:690		data := r.randString(s, a)691		if dir == DirOut {692			return MakeOutDataArg(a, dir, uint64(len(data))), nil693		}694		return MakeDataArg(a, dir, data), nil695	case BufferFilename:696		if dir == DirOut {697			var sz uint64698			switch {699			case !a.Varlen():700				sz = a.Size()701			case r.nOutOf(1, 3):702				sz = r.rand(100)703			default:704				sz = uint64(r.randFilenameLength())705			}706			return MakeOutDataArg(a, dir, sz), nil707		}708		return MakeDataArg(a, dir, []byte(r.filename(s, a))), nil709	case BufferGlob:710		return MakeDataArg(a, dir, r.randString(s, a)), nil711	case BufferText:712		if dir == DirOut {713			return MakeOutDataArg(a, dir, uint64(r.Intn(100))), nil714		}715		return MakeDataArg(a, dir, r.generateText(a.Text)), nil716	default:717		panic("unknown buffer kind")718	}...

mutation.go

Source:mutation.go

...319	}320	a := arg.(*DataArg)321	if a.Dir() == DirOut {322		if t.Kind == BufferFilename && r.oneOf(100) {323			a.size = uint64(r.randFilenameLength())324		} else {325			mutateBufferSize(r, a, minLen, maxLen)326		}327		return328	}329	switch t.Kind {330	case BufferBlobRand, BufferBlobRange:331		data := append([]byte{}, a.Data()...)332		a.data = mutateData(r, data, minLen, maxLen)333	case BufferString:334		if len(t.Values) != 0 {335			a.data = r.randString(s, t)336		} else {337			if t.TypeSize != 0 {...

randFilenameLength

Using AI Code Generation

1import (2func main() {3	rand.Seed(time.Now().UnixNano())4	for i := 0; i < 10; i++ {5		fmt.Println(randFilenameLength())6	}7}8import (9func main() {10	rand.Seed(time.Now().UnixNano())11	for i := 0; i < 10; i++ {12		fmt.Println(randFilenameLength())13	}14}

randFilenameLength

Using AI Code Generation

1import "fmt"2import "prog"3func main() {4    fmt.Println(prog.RandFilenameLength())5}6import "math/rand"7func RandFilenameLength() int {8    return rand.Intn(20)9}10import "math/rand"11func RandFilenameLength() int {12    return rand.Intn(50)13}14import "math/rand"15func RandFilenameLength() int {16    return rand.Intn(100)17}18import "math/rand"19func RandFilenameLength() int {20    return rand.Intn(200)21}22import "math/rand"23func RandFilenameLength() int {24    return rand.Intn(500)25}26import "math/rand"27func RandFilenameLength() int {28    return rand.Intn(1000)29}30import "math/rand"31func RandFilenameLength() int {32    return rand.Intn(2000)33}34import "math/rand"35func RandFilenameLength() int {36    return rand.Intn(5000)37}38import "math/rand"39func RandFilenameLength() int {40    return rand.Intn(10000)41}42import "math/rand"43func RandFilenameLength() int {44    return rand.Intn(20000)45}46import "math/rand"47func RandFilenameLength() int {48    return rand.Intn(50000)49}50import "math/rand"51func RandFilenameLength() int {52    return rand.Intn(100000)53}54import "math/rand"55func RandFilenameLength() int {56    return rand.Intn(200000)57}58import "math/rand"59func RandFilenameLength() int {60    return rand.Intn(500000)61}62import "math/rand"

randFilenameLength

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println(prog.randFilenameLength())4}5import "math/rand"6func randFilenameLength() int {7    return rand.Intn(10) + 18}9import "fmt"10import "math/rand"11func main() {12    fmt.Println(randFilenameLength())13}14func randFilenameLength() int {15    return rand.Intn(10) + 116}17David Stancu (author) from Toronto, Canada on September 27, 2019:

randFilenameLength

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	fmt.Println(randFilenameLength())5}6import (7func randFilenameLength() int {8	return rand.Intn(10)9}

randFilenameLength

Using AI Code Generation

1prog := new(prog)2prog.randFilenameLength()3prog := new(prog)4prog.randFilenameLength()5prog := new(prog)6prog.randFilenameLength()7prog := new(prog)8prog.randFilenameLength()9prog := new(prog)10prog.randFilenameLength()11prog := new(prog)12prog.randFilenameLength()13prog := new(prog)14prog.randFilenameLength()15prog := new(prog)16prog.randFilenameLength()17prog := new(prog)18prog.randFilenameLength()19prog := new(prog)20prog.randFilenameLength()21prog := new(prog)22prog.randFilenameLength()23prog := new(prog)24prog.randFilenameLength()25prog := new(prog)26prog.randFilenameLength()27prog := new(prog)28prog.randFilenameLength()29prog := new(prog)30prog.randFilenameLength()31prog := new(prog)32prog.randFilenameLength()33prog := new(prog)

randFilenameLength

Using AI Code Generation

1import (2func main() {3    fmt.Println("Random filename length is", prog.RandFilenameLength())4}5import (6func main() {7    fmt.Println("Random filename length is", prog.RandFilenameLength())8}

randFilenameLength

Using AI Code Generation

1import (2func main() {3    r := prog.randFilenameLength()4    fmt.Println(r)5    os.Exit(0)6}7import (8type prog struct {9}10func (p *prog) randFilenameLength() int {11    rand.Seed(time.Now().Unix())12    return rand.Intn(10) + 113}14import (15func main() {16    r := prog.randFilenameLength()17    fmt.Println(r)18    os.Exit(0)19}20import (21func main() {22    r := prog.randFilenameLength()23    fmt.Println(r)24    os.Exit(0)25}26import (27func main() {28    r := prog.randFilenameLength()29    fmt.Println(r)30    os.Exit(0)31}32import (33func main() {34    r := prog.randFilenameLength()35    fmt.Println(r)36    os.Exit(0)37}38import (39func main() {40    r := prog.randFilenameLength()41    fmt.Println(r)42    os.Exit(0)43}44import (45func main() {

randFilenameLength

Using AI Code Generation

1import "fmt"2func main() {3    fmt.Println(prog.randFilenameLength())4}5func randFilenameLength() int {6}7func RandFilenameLength() int {8}9import "prog"10import (11func main() {12    fmt.Println(prog.RandFilenameLength())13}14import p "prog"15import (16func main() {17    fmt.Println(p.RandFilenameLength())18}19import . "prog"20import (21func main() {22    fmt.Println(RandFilenameLength())

randFilenameLength

Using AI Code Generation

1import (2func randFilenameLength() int {3    rand.Seed(time.Now().UnixNano())4    return rand.Intn(20)5}6func main() {7    fmt.Println(randFilenameLength())8}9import (10func main() {11    fmt.Println(prog.randFilenameLength())12}13import (14func randFilenameLength() int {15    rand.Seed(time.Now().UnixNano())16    return rand.Intn(20)17}18        /usr/lib/go-1.6/src/2 (from $GOROOT)19        /home/andrew/go/src/2 (from $GOPATH)20import (21func randFilenameLength() int {22    rand.Seed(time.Now().UnixNano())

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