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How to use IsSpecial method of prog Package

Best Syzkaller code snippet using prog.IsSpecial

analysis.go

...50	ForeachArg(c, func(arg Arg, _ *ArgCtx) {51		switch a := arg.(type) {52		case *PointerArg:53			switch {54			case a.IsSpecial():55			case a.VmaSize != 0:56				s.va.noteAlloc(a.Address/s.target.PageSize, a.VmaSize/s.target.PageSize)57			case a.Res != nil:58				s.ma.noteAlloc(a.Address, a.Res.Size())59			}60		}61		switch typ := arg.Type().(type) {62		case *ResourceType:63			a := arg.(*ResultArg)64			if resources && a.Dir() != DirIn {65				s.resources[typ.Desc.Name] = append(s.resources[typ.Desc.Name], a)66				// TODO: negative PIDs and add them as well (that's process groups).67			}68		case *BufferType:69			a := arg.(*DataArg)70			if a.Dir() != DirOut && len(a.Data()) != 0 {71				val := string(a.Data())72				// Remove trailing zero padding.73				for len(val) >= 2 && val[len(val)-1] == 0 && val[len(val)-2] == 0 {74					val = val[:len(val)-1]75				}76				switch typ.Kind {77				case BufferString:78					s.strings[val] = true79				case BufferFilename:80					if len(val) < 3 || escapingFilename(val) {81						// This is not our file, probalby one of specialFiles.82						return83					}84					if val[len(val)-1] == 0 {85						val = val[:len(val)-1]86					}87					s.files[val] = true88				}89			}90		}91	})92}93type ArgCtx struct {94	Parent *[]Arg      // GroupArg.Inner (for structs) or Call.Args containing this arg95	Fields []Field     // Fields of the parent struct/syscall96	Base   *PointerArg // pointer to the base of the heap object containing this arg97	Offset uint64      // offset of this arg from the base98	Stop   bool        // if set by the callback, subargs of this arg are not visited99}100func ForeachSubArg(arg Arg, f func(Arg, *ArgCtx)) {101	foreachArgImpl(arg, &ArgCtx{}, f)102}103func ForeachArg(c *Call, f func(Arg, *ArgCtx)) {104	ctx := &ArgCtx{}105	if c.Ret != nil {106		foreachArgImpl(c.Ret, ctx, f)107	}108	ctx.Parent = &c.Args109	ctx.Fields = c.Meta.Args110	for _, arg := range c.Args {111		foreachArgImpl(arg, ctx, f)112	}113}114func foreachArgImpl(arg Arg, ctx *ArgCtx, f func(Arg, *ArgCtx)) {115	ctx0 := *ctx116	defer func() { *ctx = ctx0 }()117	f(arg, ctx)118	if ctx.Stop {119		return120	}121	switch a := arg.(type) {122	case *GroupArg:123		if typ, ok := a.Type().(*StructType); ok {124			ctx.Parent = &a.Inner125			ctx.Fields = typ.Fields126		}127		var totalSize uint64128		for _, arg1 := range a.Inner {129			foreachArgImpl(arg1, ctx, f)130			size := arg1.Size()131			ctx.Offset += size132			totalSize += size133		}134		claimedSize := a.Size()135		varlen := a.Type().Varlen()136		if varlen && totalSize > claimedSize || !varlen && totalSize != claimedSize {137			panic(fmt.Sprintf("bad group arg size %v, should be <= %v for %#v type %#v",138				totalSize, claimedSize, a, a.Type()))139		}140	case *PointerArg:141		if a.Res != nil {142			ctx.Base = a143			ctx.Offset = 0144			foreachArgImpl(a.Res, ctx, f)145		}146	case *UnionArg:147		foreachArgImpl(a.Option, ctx, f)148	}149}150func RequiredFeatures(p *Prog) (bitmasks, csums bool) {151	for _, c := range p.Calls {152		ForeachArg(c, func(arg Arg, _ *ArgCtx) {153			if a, ok := arg.(*ConstArg); ok {154				if a.Type().BitfieldOffset() != 0 || a.Type().BitfieldLength() != 0 {155					bitmasks = true156				}157			}158			if _, ok := arg.Type().(*CsumType); ok {159				csums = true160			}161		})162	}163	return164}165type CallFlags int166const (167	CallExecuted CallFlags = 1 << iota // was started at all168	CallFinished                       // finished executing (rather than blocked forever)169	CallBlocked                        // finished but blocked during execution170)171type CallInfo struct {172	Flags  CallFlags173	Errno  int174	Signal []uint32175}176const (177	fallbackSignalErrno = iota178	fallbackSignalErrnoBlocked179	fallbackSignalCtor180	fallbackSignalFlags181	fallbackCallMask = 0x1fff182)183func (p *Prog) FallbackSignal(info []CallInfo) {184	resources := make(map[*ResultArg]*Call)185	for i, c := range p.Calls {186		inf := &info[i]187		if inf.Flags&CallExecuted == 0 {188			continue189		}190		id := c.Meta.ID191		typ := fallbackSignalErrno192		if inf.Flags&CallFinished != 0 && inf.Flags&CallBlocked != 0 {193			typ = fallbackSignalErrnoBlocked194		}195		inf.Signal = append(inf.Signal, encodeFallbackSignal(typ, id, inf.Errno))196		if c.Meta.Attrs.BreaksReturns {197			break198		}199		if inf.Errno != 0 {200			continue201		}202		ForeachArg(c, func(arg Arg, _ *ArgCtx) {203			if a, ok := arg.(*ResultArg); ok {204				resources[a] = c205			}206		})207		// Specifically look only at top-level arguments,208		// deeper arguments can produce too much false signal.209		flags := 0210		for _, arg := range c.Args {211			flags = extractArgSignal(arg, id, flags, inf, resources)212		}213		if flags != 0 {214			inf.Signal = append(inf.Signal,215				encodeFallbackSignal(fallbackSignalFlags, id, flags))216		}217	}218}219func extractArgSignal(arg Arg, callID, flags int, inf *CallInfo, resources map[*ResultArg]*Call) int {220	switch a := arg.(type) {221	case *ResultArg:222		flags <<= 1223		if a.Res != nil {224			ctor := resources[a.Res]225			if ctor != nil {226				inf.Signal = append(inf.Signal,227					encodeFallbackSignal(fallbackSignalCtor, callID, ctor.Meta.ID))228			}229		} else {230			if a.Val != a.Type().(*ResourceType).SpecialValues()[0] {231				flags |= 1232			}233		}234	case *ConstArg:235		const width = 3236		flags <<= width237		switch typ := a.Type().(type) {238		case *FlagsType:239			if typ.BitMask {240				for i, v := range typ.Vals {241					if a.Val&v != 0 {242						flags ^= 1 << (uint(i) % width)243					}244				}245			} else {246				for i, v := range typ.Vals {247					if a.Val == v {248						flags |= i % (1 << width)249						break250					}251				}252			}253		case *LenType:254			flags <<= 1255			if a.Val == 0 {256				flags |= 1257			}258		}259	case *PointerArg:260		flags <<= 1261		if a.IsSpecial() {262			flags |= 1263		}264	}265	return flags266}267func DecodeFallbackSignal(s uint32) (callID, errno int) {268	typ, id, aux := decodeFallbackSignal(s)269	switch typ {270	case fallbackSignalErrno, fallbackSignalErrnoBlocked:271		return id, aux272	case fallbackSignalCtor, fallbackSignalFlags:273		return id, 0274	default:275		panic(fmt.Sprintf("bad fallback signal type %v", typ))...

test.go

Source: test.go

...64				if typ.Kind == prog.BufferString && len(typ.Values) == 1 {65					return // string const66				}67			case *prog.PtrType:68				if arg.(*prog.PointerArg).IsSpecial() {69					// TODO: we ought to mutate this, but we don't have code for this yet.70					return71				}72				return73			// Do not mutate the following types74			case *prog.ResourceType:75				return76			case *prog.FlagsType:77				return78			case *prog.LenType:79				return80			}81			typ := arg.Type()82			if typ == nil || typ.Dir() == prog.DirOut || !typ.Varlen() && typ.Size() == 0 {...

IsSpecial

Using AI Code Generation

1import "fmt"2func main() {3    a = prog{1, "Go"}4    if a.IsSpecial() {5        fmt.Println("Special")6    } else {7        fmt.Println("Not Special")8    }9}10import "fmt"11type prog struct {12}13func (p prog) IsSpecial() bool {14}15func (p progList) IsSpecial() bool {16    return len(p) > 017}18func main() {19    p = prog{1, "Go"}20    pl = progList{prog{1, "Go"}, prog{2, "Java"}}21    if p.IsSpecial() {22        fmt.Println("Special")23    } else {24        fmt.Println("Not Special")25    }26    if pl.IsSpecial() {27        fmt.Println("Special")28    } else {29        fmt.Println("Not Special")30    }31}32import "fmt"33type prog struct {34}35func (p prog) IsSpecial() bool {36}37func (p progList) IsSpecial() bool {38    return len(p) > 039}40func main() {41    p = prog{1, "Go"}42    pl = progList{prog{1, "Go"}, prog{2, "Java"}}43    if p.IsSpecial() {44        fmt.Println("Special")45    } else {46        fmt.Println("Not Special")47    }48    if pl.IsSpecial() {49        fmt.Println("Special")50    } else {51        fmt.Println("Not Special")52    }53}

IsSpecial

Using AI Code Generation

1import (2func main() {3	fmt.Printf("Is %d special? %t4", i, i.IsSpecial())5}6import (7func main() {8	fmt.Printf("Is %d special? %t9", i, i.IsSpecial())10}11import (12func main() {13	fmt.Printf("Is %d special? %t14", i, i.IsSpecial())15}16The prog package can be imported in the main package by using the import statement. The prog package can be

IsSpecial

Using AI Code Generation

1import "fmt"2import "prog"3func main() {4    fmt.Println(prog.IsSpecial(5))5}6func IsSpecial(n int) bool {7    if n == 2 || n == 3 || n == 5 || n == 7 {8    }9}10import "fmt"11import "prog"12func main() {13    fmt.Println(prog.IsSpecial(5))14}15func isSpecial(n int) bool {16    if n == 2 || n == 3 || n == 5 || n == 7 {17    }18}19import "fmt"20import "prog"21func main() {22    fmt.Println(prog.IsSpecial(5))23}

IsSpecial

Using AI Code Generation

1import (2func main() {3    fmt.Println("IsSpecial(5) = ", prog.IsSpecial(5))4    fmt.Println("IsSpecial(7) = ", prog.IsSpecial(7))5}6IsSpecial(5) =  false7IsSpecial(7) =  true

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