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How to use generate method of prog Package

Best Syzkaller code snippet using prog.generate

init_alg.go

Source:init_alg.go

...4import (5	"math/rand"6	"github.com/google/syzkaller/prog"7)8func (arch *arch) generateSockaddrAlg(g *prog.Gen, typ0 prog.Type, dir prog.Dir, old prog.Arg) (9	arg prog.Arg, calls []*prog.Call) {10	typ := typ0.(*prog.StructType)11	family := g.GenerateArg(typ.Fields[0].Type, dir, &calls)12	// There is very little point in generating feat/mask,13	// because that can only fail otherwise correct bind.14	feat := prog.MakeConstArg(typ.Fields[2].Type, dir, 0)15	mask := prog.MakeConstArg(typ.Fields[3].Type, dir, 0)16	if g.NOutOf(1, 1000) {17		feat = g.GenerateArg(typ.Fields[2].Type, dir, &calls).(*prog.ConstArg)18		mask = g.GenerateArg(typ.Fields[3].Type, dir, &calls).(*prog.ConstArg)19	}20	algType, algName := generateAlgName(g.Rand())21	// Extend/truncate type/name to their fixed sizes.22	algTypeData := fixedSizeData(algType, typ.Fields[1].Type.Size())23	algNameData := fixedSizeData(algName, typ.Fields[4].Type.Size())24	arg = prog.MakeGroupArg(typ, dir, []prog.Arg{25		family,26		prog.MakeDataArg(typ.Fields[1].Type, dir, algTypeData),27		feat,28		mask,29		prog.MakeDataArg(typ.Fields[4].Type, dir, algNameData),30	})31	return32}33func (arch *arch) generateAlgName(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (34	arg prog.Arg, calls []*prog.Call) {35	return generateAlgNameStruct(g, typ, dir, allTypes[g.Rand().Intn(len(allTypes))].typ)36}37func (arch *arch) generateAlgAeadName(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (38	arg prog.Arg, calls []*prog.Call) {39	return generateAlgNameStruct(g, typ, dir, ALG_AEAD)40}41func (arch *arch) generateAlgHashName(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (42	arg prog.Arg, calls []*prog.Call) {43	return generateAlgNameStruct(g, typ, dir, ALG_HASH)44}45func (arch *arch) generateAlgSkcipherhName(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (46	arg prog.Arg, calls []*prog.Call) {47	return generateAlgNameStruct(g, typ, dir, ALG_SKCIPHER)48}49func generateAlgNameStruct(g *prog.Gen, typ0 prog.Type, dir prog.Dir, algTyp int) (50	arg prog.Arg, calls []*prog.Call) {51	typ := typ0.(*prog.StructType)52	algName := generateAlg(g.Rand(), algTyp)53	algNameData := fixedSizeData(algName, typ.Fields[0].Size())54	arg = prog.MakeGroupArg(typ, dir, []prog.Arg{55		prog.MakeDataArg(typ.Fields[0].Type, dir, algNameData),56	})57	return58}59func generateAlgName(rnd *rand.Rand) (string, string) {60	typ := allTypes[rnd.Intn(len(allTypes))]61	name := generateAlg(rnd, typ.typ)62	return typ.name, name63}64func generateAlg(rnd *rand.Rand, typ int) string {65	algs := allAlgs[typ]66	alg := algs[rnd.Intn(len(algs))]67	return generateAlgImpl(rnd, alg)68}69func generateAlgImpl(rnd *rand.Rand, alg algDesc) string {70	args := ""71	if len(alg.args) != 0 {72		args += "("73		for i, a := range alg.args {74			if i != 0 {75				args += ","76			}77			args += generateAlg(rnd, a)78		}79		args += ")"80	}81	return alg.name + args82}83func fixedSizeData(str string, sz uint64) []byte {84	return append([]byte(str), make([]byte, sz)...)[:sz]85}86type algType struct {87	name string88	typ  int89}90type algDesc struct {91	name string...

init.go

Source:init.go

...46	target.MakeDataMmap = targets.MakePosixMmap(target, true, true)47	target.Neutralize = arch.neutralize48	target.SpecialTypes = map[string]func(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (49		prog.Arg, []*prog.Call){50		"timespec":                  arch.generateTimespec,51		"timeval":                   arch.generateTimespec,52		"sockaddr_alg":              arch.generateSockaddrAlg,53		"alg_name":                  arch.generateAlgName,54		"alg_aead_name":             arch.generateAlgAeadName,55		"alg_hash_name":             arch.generateAlgHashName,56		"alg_skcipher_name":         arch.generateAlgSkcipherhName,57		"ipt_replace":               arch.generateIptables,58		"ip6t_replace":              arch.generateIptables,59		"arpt_replace":              arch.generateArptables,60		"ebt_replace":               arch.generateEbtables,61		"usb_device_descriptor":     arch.generateUsbDeviceDescriptor,62		"usb_device_descriptor_hid": arch.generateUsbHidDeviceDescriptor,63	}64	target.AuxResources = map[string]bool{65		"uid":       true,66		"pid":       true,67		"gid":       true,68		"timespec":  true,69		"timeval":   true,70		"time_sec":  true,71		"time_usec": true,72		"time_nsec": true,73	}74	switch target.Arch {75	case "amd64":76		target.SpecialPointers = []uint64{77			0xffffffff81000000, // kernel text78		}79	case "386", "arm64", "arm", "ppc64le", "mips64le", "s390x", "riscv64":80	default:81		panic("unknown arch")82	}83	if target.Arch == runtime.GOARCH {84		KCOV_INIT_TRACE = uintptr(target.GetConst("KCOV_INIT_TRACE"))85		KCOV_ENABLE = uintptr(target.GetConst("KCOV_ENABLE"))86		KCOV_REMOTE_ENABLE = uintptr(target.GetConst("KCOV_REMOTE_ENABLE"))87		KCOV_DISABLE = uintptr(target.GetConst("KCOV_DISABLE"))88		KCOV_TRACE_PC = uintptr(target.GetConst("KCOV_TRACE_PC"))89		KCOV_TRACE_CMP = uintptr(target.GetConst("KCOV_TRACE_CMP"))90	}91}92var (93	// This should not be here, but for now we expose this for syz-fuzzer.94	KCOV_INIT_TRACE    uintptr95	KCOV_ENABLE        uintptr96	KCOV_REMOTE_ENABLE uintptr97	KCOV_DISABLE       uintptr98	KCOV_TRACE_PC      uintptr99	KCOV_TRACE_CMP     uintptr100)101type arch struct {102	unix *targets.UnixNeutralizer103	clockGettimeSyscall *prog.Syscall104	MREMAP_MAYMOVE              uint64105	MREMAP_FIXED                uint64106	SYSLOG_ACTION_CONSOLE_OFF   uint64107	SYSLOG_ACTION_CONSOLE_ON    uint64108	SYSLOG_ACTION_CONSOLE_LEVEL uint64109	SYSLOG_ACTION_CLEAR         uint64110	SYSLOG_ACTION_SIZE_UNREAD   uint64111	FIFREEZE                    uint64112	FITHAW                      uint64113	SNAPSHOT_FREEZE             uint64114	SNAPSHOT_POWER_OFF          uint64115	EXT4_IOC_SHUTDOWN           uint64116	EXT4_IOC_RESIZE_FS          uint64117	EXT4_IOC_MIGRATE            uint64118	FAN_OPEN_PERM               uint64119	FAN_ACCESS_PERM             uint64120	FAN_OPEN_EXEC_PERM          uint64121	PTRACE_TRACEME              uint64122	CLOCK_REALTIME              uint64123	ARCH_SET_FS                 uint64124	ARCH_SET_GS                 uint64125	AF_NFC                      uint64126	AF_LLC                      uint64127	AF_BLUETOOTH                uint64128	AF_X25                      uint64129	AF_AX25                     uint64130	AF_NETROM                   uint64131	AF_ROSE                     uint64132	USB_MAJOR                   uint64133	TIOCSSERIAL                 uint64134	TIOCGSERIAL                 uint64135}136func (arch *arch) neutralize(c *prog.Call) {137	arch.unix.Neutralize(c)138	switch c.Meta.CallName {139	case "mremap":140		// Add MREMAP_FIXED flag, otherwise it produces non-deterministic results.141		flags := c.Args[3].(*prog.ConstArg)142		if flags.Val&arch.MREMAP_MAYMOVE != 0 {143			flags.Val |= arch.MREMAP_FIXED144		}145	case "syslog":146		cmd := c.Args[0].(*prog.ConstArg)147		cmd.Val = uint64(uint32(cmd.Val))148		// These disable console output, but we need it.149		if cmd.Val == arch.SYSLOG_ACTION_CONSOLE_OFF ||150			cmd.Val == arch.SYSLOG_ACTION_CONSOLE_ON ||151			cmd.Val == arch.SYSLOG_ACTION_CONSOLE_LEVEL ||152			cmd.Val == arch.SYSLOG_ACTION_CLEAR {153			cmd.Val = arch.SYSLOG_ACTION_SIZE_UNREAD154		}155	case "ioctl":156		arch.neutralizeIoctl(c)157	case "fanotify_mark":158		// FAN_*_PERM require the program to reply to open requests.159		// If that does not happen, the program will hang in an unkillable state forever.160		// See the following bug for details:161		// https://groups.google.com/d/msg/syzkaller-bugs/pD-vbqJu6U0/kGH30p3lBgAJ162		mask := c.Args[2].(*prog.ConstArg)163		mask.Val &^= arch.FAN_OPEN_PERM | arch.FAN_ACCESS_PERM | arch.FAN_OPEN_EXEC_PERM164	case "ptrace":165		req := c.Args[0].(*prog.ConstArg)166		// PTRACE_TRACEME leads to unkillable processes, see:167		// https://groups.google.com/forum/#!topic/syzkaller/uGzwvhlCXAw168		if uint64(uint32(req.Val)) == arch.PTRACE_TRACEME {169			req.Val = ^uint64(0)170		}171	case "arch_prctl":172		// fs holds address of tls, if a program messes it at least signal173		// handling will break. This also allows a program to do writes174		// at arbitrary addresses, which usually leads to machine outbreak.175		cmd := c.Args[0].(*prog.ConstArg)176		if uint64(uint32(cmd.Val)) == arch.ARCH_SET_FS {177			cmd.Val = arch.ARCH_SET_GS178		}179	case "init_module":180		// Kernel tries to vmalloc whatever we pass as size and it's not accounted against memcg.181		// As the result it can lead to massive OOM kills of everything running on the machine.182		// Strictly saying, the same applies to finit_module with a sparse file too,183		// but there is no simple way to handle that.184		sz := c.Args[1].(*prog.ConstArg)185		sz.Val %= 1 << 20186	case "syz_init_net_socket":187		// Don't let it mess with arbitrary sockets in init namespace.188		family := c.Args[0].(*prog.ConstArg)189		switch uint64(uint32(family.Val)) {190		case arch.AF_NFC, arch.AF_LLC, arch.AF_BLUETOOTH,191			arch.AF_X25, arch.AF_AX25, arch.AF_NETROM, arch.AF_ROSE:192		default:193			family.Val = ^uint64(0)194		}195	case "syz_open_dev":196		enforceIntArg(c.Args[0])197		enforceIntArg(c.Args[1])198		enforceIntArg(c.Args[2])199	}200	switch c.Meta.Name {201	case "setsockopt$EBT_SO_SET_ENTRIES":202		arch.neutralizeEbtables(c)203	}204}205func enforceIntArg(a prog.Arg) {206	arg, ok := a.(*prog.ConstArg)207	if !ok {208		return209	}210	switch typ := arg.Type().(type) {211	case *prog.ConstType:212		arg.Val = typ.Val213	case *prog.IntType:214		if typ.Kind == prog.IntRange && (arg.Val < typ.RangeBegin || arg.Val > typ.RangeEnd) {215			arg.Val = typ.RangeBegin216		}217	}218}219func (arch *arch) neutralizeIoctl(c *prog.Call) {220	cmd := c.Args[1].(*prog.ConstArg)221	switch uint64(uint32(cmd.Val)) {222	case arch.FIFREEZE:223		// Freeze kills machine. Though, it is an interesting functions,224		// so we need to test it somehow.225		// TODO: not required if executor drops privileges.226		// Fortunately, the value does not conflict with any other ioctl commands for now.227		cmd.Val = arch.FITHAW228	case arch.SNAPSHOT_FREEZE:229		// SNAPSHOT_FREEZE freezes all processes and leaves the machine dead.230		cmd.Val = arch.FITHAW231	case arch.SNAPSHOT_POWER_OFF:232		// SNAPSHOT_POWER_OFF shuts down the machine.233		cmd.Val = arch.FITHAW234	case arch.EXT4_IOC_SHUTDOWN:235		// EXT4_IOC_SHUTDOWN on root fs effectively brings the machine down in weird ways.236		// Fortunately, the value does not conflict with any other ioctl commands for now.237		cmd.Val = arch.EXT4_IOC_MIGRATE238	case arch.EXT4_IOC_RESIZE_FS:239		// EXT4_IOC_RESIZE_FS on root fs can shrink it to 0 (or whatever is the minimum size)240		// and then creation of new temp dirs for tests will fail.241		// TODO: not necessary for sandbox=namespace as it tests in a tmpfs242		// and/or if we mount tmpfs for sandbox=none (#971).243		cmd.Val = arch.EXT4_IOC_MIGRATE244	case arch.TIOCSSERIAL:245		// TIOCSSERIAL can do nasty things under root, like causing writes to random memory246		// pretty much like /dev/mem, but this is also working as intended.247		// For details see:248		// https://groups.google.com/g/syzkaller-bugs/c/1rVENJf9P4U/m/QtGpapRxAgAJ249		// https://syzkaller.appspot.com/bug?extid=f4f1e871965064ae689e250		// TODO: TIOCSSERIAL does some other things that are not dangerous251		// and would be nice to test, if/when we can neutralize based on sandbox value252		// we could prohibit it only under sandbox=none.253		cmd.Val = arch.TIOCGSERIAL254	}255}256func (arch *arch) generateTimespec(g *prog.Gen, typ0 prog.Type, dir prog.Dir, old prog.Arg) (257	arg prog.Arg, calls []*prog.Call) {258	typ := typ0.(*prog.StructType)259	// We need to generate timespec/timeval that are either260	// (1) definitely in the past, or261	// (2) definitely in unreachable fututre, or262	// (3) few ms ahead of now.263	// Note: timespec/timeval can be absolute or relative to now.264	// Note: executor has blocking syscall timeout of 45 ms,265	// so we generate both 10ms and 60ms.266	const (267		timeout1 = uint64(10)268		timeout2 = uint64(60)269	)270	usec := typ.Name() == "timeval"271	switch {272	case g.NOutOf(1, 4):273		// Now for relative, past for absolute.274		arg = prog.MakeGroupArg(typ, dir, []prog.Arg{275			prog.MakeResultArg(typ.Fields[0].Type, dir, nil, 0),276			prog.MakeResultArg(typ.Fields[1].Type, dir, nil, 0),277		})278	case g.NOutOf(1, 3):279		// Few ms ahead for relative, past for absolute....

init_iptables.go

Source:init_iptables.go

...4import (5	"strings"6	"github.com/google/syzkaller/prog"7)8func (arch *arch) generateIptables(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (9	arg prog.Arg, calls []*prog.Call) {10	return arch.generateNetfilterTable(g, typ, dir, old, true, 5)11}12func (arch *arch) generateArptables(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (13	arg prog.Arg, calls []*prog.Call) {14	return arch.generateNetfilterTable(g, typ, dir, old, false, 3)15}16func (arch *arch) generateNetfilterTable(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg,17	hasUnion bool, hookCount int) (arg prog.Arg, calls []*prog.Call) {18	const (19		hookStart     = 420		nonHookFields = 721		unused        = uint64(^uint32(0))22	)23	if old == nil {24		arg = g.GenerateSpecialArg(typ, dir, &calls)25	} else {26		// TODO(dvyukov): try to restore original hook order after mutation27		// instead of assigning brand new offsets.28		arg = old29		calls = g.MutateArg(arg)30	}31	var tableArg *prog.GroupArg32	if hasUnion {33		tableArg = arg.(*prog.UnionArg).Option.(*prog.GroupArg)34	} else {35		tableArg = arg.(*prog.GroupArg)36	}37	numFileds := nonHookFields + 2*hookCount38	if len(tableArg.Inner) != numFileds {39		panic("wrong number of fields in netfilter table")40	}41	entriesArg := tableArg.Inner[numFileds-1].(*prog.GroupArg)42	if len(entriesArg.Inner) != 2 {43		panic("netfilter entries is expected to have 2 fields")44	}45	entriesArray := entriesArg.Inner[0].(*prog.GroupArg)46	// Collect offsets of entries.47	offsets := make([]uint64, len(entriesArray.Inner))48	var pos uint6449	for i, entryArg := range entriesArray.Inner {50		offsets[i] = pos51		pos += entryArg.Size()52	}53	if pos != entriesArray.Size() {54		panic("netfilter offsets are broken")55	}56	genOffset := func() uint64 {57		if g.Rand().Intn(100) == 0 {58			// Assign the underflow entry once in a while.59			// We have it in underflow hooks, so no point in using it frequently.60			return pos61		}62		return offsets[g.Rand().Intn(len(offsets))]63	}64	// Assign offsets to used hooks.65	for hook := hookStart; hook < hookStart+hookCount; hook++ {66		hookArg := tableArg.Inner[hook].(*prog.ConstArg)67		if hookArg.Type().(*prog.ConstType).Val == unused {68			continue // unused hook69		}70		hookArg.Val = genOffset()71	}72	// Assign offsets to used underflow entries.73	for hook := hookStart + hookCount; hook < hookStart+2*hookCount; hook++ {74		hookArg := tableArg.Inner[hook].(*prog.ConstArg)75		if hookArg.Type().(*prog.ConstType).Val == unused {76			continue // unused hook77		}78		hookArg.Val = pos79	}80	// Now update standard target jump offsets.81	prog.ForeachSubArg(arg, func(arg prog.Arg, _ *prog.ArgCtx) {82		if !strings.HasPrefix(arg.Type().Name(), `xt_target_t["", `) {83			return84		}85		targetArg := arg.(*prog.GroupArg)86		valArg := targetArg.Inner[3].(*prog.ConstArg)87		flagsType, ok := valArg.Type().(*prog.FlagsType)88		if !ok {89			return90		}91		if int64(valArg.Val) < 0 {92			for _, val := range flagsType.Vals {93				if val == valArg.Val {94					return // verdict95				}96			}97		}98		valArg.Val = genOffset()99	})100	return101}102func (arch *arch) generateEbtables(g *prog.Gen, typ prog.Type, dir prog.Dir, old prog.Arg) (103	arg prog.Arg, calls []*prog.Call) {104	if old == nil {105		arg = g.GenerateSpecialArg(typ, dir, &calls)106	} else {107		// TODO(dvyukov): try to restore original hook order after mutation108		// instead of assigning brand new offsets.109		arg = old110		calls = g.MutateArg(arg)111	}112	if g.Target().ArgContainsAny(arg) {113		return114	}115	hooksField, entriesField := 4, 7116	if g.Target().PtrSize == 8 {...

generate

Using AI Code Generation

1import "fmt"2func main() {3    p := prog{1, "golang"}4    p.generate()5}6import "fmt"7func main() {8    p := prog{1, "golang"}9    p.generate()10}11import "fmt"12func main() {13    p := prog{1, "golang"}14    p.generate()15}16import "fmt"17func main() {18    p := prog{1, "golang"}19    p.generate()20}21import "fmt"22func main() {23    p := prog{1, "golang"}24    p.generate()25}26import "fmt"27func main() {28    p := prog{1, "golang"}29    p.generate()30}31import "fmt"32func main() {33    p := prog{1, "golang"}34    p.generate()35}36import "fmt"37func main() {38    p := prog{1, "golang"}39    p.generate()40}41import "fmt"42func main() {43    p := prog{1, "golang"}44    p.generate()45}46import "fmt"47func main() {48    p := prog{1, "golang"}49    p.generate()50}51import "fmt"52func main() {53    p := prog{1, "golang"}54    p.generate()55}56import "fmt"57func main() {

generate

Using AI Code Generation

1import "fmt"2func main() {3    p := prog{}4    p.generate()5}6import "fmt"7type prog struct{}8func (p prog) generate() {9    fmt.Println("generating code")10}

generate

Using AI Code Generation

1import (2func main() {3	p := new(prog)4	p.generate()5}6import (7func main() {8	p := new(prog)9	p.generate()10}11import (12func main() {13	p := new(prog)14	p.generate()15}16import (17func main() {18	p := new(prog)19	p.generate()20}21import (22func main() {23	p := new(prog)24	p.generate()25}26import (27func main() {28	p := new(prog)29	p.generate()30}31import (32func main() {33	p := new(prog)34	p.generate()35}36import (37func main() {38	p := new(prog)39	p.generate()40}41import (42func main() {43	p := new(prog)44	p.generate()45}46import (47func main() {

generate

Using AI Code Generation

1import (2func main() {3	p.generate()4}5import (6type prog struct {7}8func (p prog) generate() {9	fmt.Println("Generate method of prog class")10}11import (12type prog struct {13}14func (p prog) generate() {15	fmt.Println("Generate method of prog class")16}17import (18type prog struct {19}20func (p prog) generate() {21	fmt.Println("Generate method of prog class")22}23import (24type prog struct {25}26func (p prog) generate() {27	fmt.Println("Generate method of prog class")28}29import (30type prog struct {31}32func (p prog) generate() {33	fmt.Println("Generate method of prog class")34}35import (36type prog struct {37}38func (p prog) generate() {39	fmt.Println("Generate method of prog class")40}41import (42type prog struct {43}44func (p prog) generate() {45	fmt.Println("Generate method of prog class")46}47import (48type prog struct {49}50func (p prog) generate() {51	fmt.Println("Generate method of prog class")52}53import (54type prog struct {55}56func (p prog) generate() {57	fmt.Println("Generate method of prog class")58}

generate

Using AI Code Generation

1import "fmt"2func main() {3    prog := new(Prog)4    prog.Generate()5    fmt.Println(prog)6}7import "fmt"8func main() {9    prog := new(Prog)10    prog.Generate()11    fmt.Println(prog)12}13import "fmt"14func main() {15    prog := new(Prog)16    prog.Generate()17    fmt.Println(prog)18}19import "fmt"20func main() {21    prog := new(Prog)22    prog.Generate()23    fmt.Println(prog)24}25import "fmt"26func main() {27    prog := new(Prog)28    prog.Generate()29    fmt.Println(prog)30}31import "fmt"32func main() {33    prog := new(Prog)34    prog.Generate()35    fmt.Println(prog)36}37import "fmt"38func main() {39    prog := new(Prog)40    prog.Generate()41    fmt.Println(prog)42}43import "fmt"44func main() {45    prog := new(Prog)46    prog.Generate()

generate

Using AI Code Generation

1import (2func main() {3	}4	p.generate()5}6import (7func main() {8	}9	p.generate()10}11import (12func main() {13	}14	p.generate()15}16import (17func main() {18	}19	p.generate()20}21import (22func main() {23	}24	p.generate()25}26import (27func main() {28	}29	p.generate()30}31import (32func main() {33	}34	p.generate()35}36import (37func main() {38	}39	p.generate()40}41import (

generate

Using AI Code Generation

1import "fmt"2func main() {3	p := prog{name: "Naveen", age: 50}4	p.generate()5}6import "fmt"7type prog struct {8}9func (p prog) generate() {10	fmt.Println(p.name, p.age)11}12import "fmt"13func main() {14	p := prog{name: "Naveen", age: 50}15	p.generate()16	p.generate()17}18import "fmt"19type prog struct {20}21func (p prog) generate() {22	fmt.Println(p.name, p.age)23}24import "fmt"25func main() {26	p := prog{name: "Naveen", age: 50}27	p.generate()28	p.generate()29	p.update()

generate

Using AI Code Generation

1import (2func main() {3 p.generate()4 fmt.Println(p)5}6{0 0}

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