/
types.go
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/
types.go
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// Copyright 2015/2016 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 prog
import (
"fmt"
"strings"
)
type Syscall struct {
ID int
NR uint64 // kernel syscall number
Name string
CallName string
MissingArgs int // number of trailing args that should be zero-filled
Args []Type
Ret Type
inputResources []*ResourceDesc
outputResources []*ResourceDesc
}
type Dir int
const (
DirIn Dir = iota
DirOut
DirInOut
)
func (dir Dir) String() string {
switch dir {
case DirIn:
return "in"
case DirOut:
return "out"
case DirInOut:
return "inout"
default:
panic("unknown dir")
}
}
type BinaryFormat int
const (
FormatNative BinaryFormat = iota
FormatBigEndian
FormatStrDec
FormatStrHex
FormatStrOct
)
type Type interface {
String() string
Name() string
FieldName() string
TemplateName() string // for template structs name without arguments
Dir() Dir
Optional() bool
Varlen() bool
Size() uint64
TypeBitSize() uint64
Format() BinaryFormat
BitfieldOffset() uint64
BitfieldLength() uint64
IsBitfield() bool
// For most of the types UnitSize is equal to Size.
// These are different only for all but last bitfield in the group,
// where Size == 0 and UnitSize equals to the underlying bitfield type size.
UnitSize() uint64
UnitOffset() uint64
DefaultArg() Arg
isDefaultArg(arg Arg) bool
generate(r *randGen, s *state) (arg Arg, calls []*Call)
mutate(r *randGen, s *state, arg Arg, ctx ArgCtx) (calls []*Call, retry, preserve bool)
getMutationPrio(target *Target, arg Arg, ignoreSpecial bool) (prio float64, stopRecursion bool)
minimize(ctx *minimizeArgsCtx, arg Arg, path string) bool
}
func IsPad(t Type) bool {
if ct, ok := t.(*ConstType); ok && ct.IsPad {
return true
}
return false
}
type TypeCommon struct {
TypeName string
FldName string // for struct fields and named args
// Static size of the type, or 0 for variable size types and all but last bitfields in the group.
TypeSize uint64
ArgDir Dir
IsOptional bool
IsVarlen bool
}
func (t *TypeCommon) Name() string {
return t.TypeName
}
func (t *TypeCommon) FieldName() string {
return t.FldName
}
func (t *TypeCommon) TemplateName() string {
name := t.TypeName
if pos := strings.IndexByte(name, '['); pos != -1 {
name = name[:pos]
}
return name
}
func (t *TypeCommon) Optional() bool {
return t.IsOptional
}
func (t *TypeCommon) Size() uint64 {
if t.IsVarlen {
panic(fmt.Sprintf("static type size is not known: %#v", t))
}
return t.TypeSize
}
func (t *TypeCommon) TypeBitSize() uint64 {
panic("cannot get the bitsize for a non-integer type")
}
func (t *TypeCommon) Varlen() bool {
return t.IsVarlen
}
func (t *TypeCommon) Format() BinaryFormat {
return FormatNative
}
func (t *TypeCommon) BitfieldOffset() uint64 {
return 0
}
func (t *TypeCommon) BitfieldLength() uint64 {
return 0
}
func (t *TypeCommon) UnitSize() uint64 {
return t.Size()
}
func (t *TypeCommon) UnitOffset() uint64 {
return 0
}
func (t *TypeCommon) IsBitfield() bool {
return false
}
func (t TypeCommon) Dir() Dir {
return t.ArgDir
}
type ResourceDesc struct {
Name string
Type Type
Kind []string
Values []uint64
Ctors []ResourceCtor
}
type ResourceCtor struct {
Call int // Index in Target.Syscalls
Precise bool
}
type ResourceType struct {
TypeCommon
ArgFormat BinaryFormat
Desc *ResourceDesc
}
func (t *ResourceType) String() string {
return t.Name()
}
func (t *ResourceType) DefaultArg() Arg {
return MakeResultArg(t, nil, t.Default())
}
func (t *ResourceType) isDefaultArg(arg Arg) bool {
a := arg.(*ResultArg)
return a.Res == nil && a.OpDiv == 0 && a.OpAdd == 0 &&
len(a.uses) == 0 && a.Val == t.Default()
}
func (t *ResourceType) Default() uint64 {
return t.Desc.Values[0]
}
func (t *ResourceType) SpecialValues() []uint64 {
return t.Desc.Values
}
func (t *ResourceType) Format() BinaryFormat {
return t.ArgFormat
}
type IntTypeCommon struct {
TypeCommon
ArgFormat BinaryFormat
BitfieldOff uint64
BitfieldLen uint64
BitfieldUnit uint64
BitfieldUnitOff uint64
}
func (t *IntTypeCommon) String() string {
return t.Name()
}
func (t *IntTypeCommon) Format() BinaryFormat {
return t.ArgFormat
}
// Returns the size in bits for integers in binary format or 64 for string-formatted integers. The return
// value is used in computing limits and truncating other values.
func (t *IntTypeCommon) TypeBitSize() uint64 {
if t.ArgFormat != FormatNative && t.ArgFormat != FormatBigEndian {
// TODO: add special cases for mutation and generation of string-formatted integers.
return 64
}
if t.BitfieldLen != 0 {
return t.BitfieldLen
}
return t.TypeSize * 8
}
func (t *IntTypeCommon) BitfieldOffset() uint64 {
return t.BitfieldOff
}
func (t *IntTypeCommon) BitfieldLength() uint64 {
return t.BitfieldLen
}
func (t *IntTypeCommon) UnitSize() uint64 {
if t.BitfieldLen != 0 {
return t.BitfieldUnit
}
return t.Size()
}
func (t *IntTypeCommon) UnitOffset() uint64 {
return t.BitfieldUnitOff
}
func (t *IntTypeCommon) IsBitfield() bool {
return t.BitfieldLen != 0
}
type ConstType struct {
IntTypeCommon
Val uint64
IsPad bool
}
func (t *ConstType) DefaultArg() Arg {
return MakeConstArg(t, t.Val)
}
func (t *ConstType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == t.Val
}
func (t *ConstType) String() string {
if t.IsPad {
return fmt.Sprintf("pad[%v]", t.Size())
}
return fmt.Sprintf("const[%v, %v]", t.Val, t.IntTypeCommon.String())
}
type IntKind int
const (
IntPlain IntKind = iota
IntRange
)
type IntType struct {
IntTypeCommon
Kind IntKind
RangeBegin uint64
RangeEnd uint64
Align uint64
}
func (t *IntType) DefaultArg() Arg {
return MakeConstArg(t, 0)
}
func (t *IntType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == 0
}
type FlagsType struct {
IntTypeCommon
Vals []uint64
BitMask bool
}
func (t *FlagsType) DefaultArg() Arg {
return MakeConstArg(t, 0)
}
func (t *FlagsType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == 0
}
type LenType struct {
IntTypeCommon
BitSize uint64 // want size in multiple of bits instead of array size
Offset bool // offset from the beginning of the parent struct or base object
Path []string
}
func (t *LenType) DefaultArg() Arg {
return MakeConstArg(t, 0)
}
func (t *LenType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == 0
}
type ProcType struct {
IntTypeCommon
ValuesStart uint64
ValuesPerProc uint64
}
const (
MaxPids = 32
procDefaultValue = 0xffffffffffffffff // special value denoting 0 for all procs
)
func (t *ProcType) DefaultArg() Arg {
return MakeConstArg(t, procDefaultValue)
}
func (t *ProcType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == procDefaultValue
}
type CsumKind int
const (
CsumInet CsumKind = iota
CsumPseudo
)
type CsumType struct {
IntTypeCommon
Kind CsumKind
Buf string
Protocol uint64 // for CsumPseudo
}
func (t *CsumType) String() string {
return "csum"
}
func (t *CsumType) DefaultArg() Arg {
return MakeConstArg(t, 0)
}
func (t *CsumType) isDefaultArg(arg Arg) bool {
return arg.(*ConstArg).Val == 0
}
type VmaType struct {
TypeCommon
RangeBegin uint64 // in pages
RangeEnd uint64
}
func (t *VmaType) String() string {
return "vma"
}
func (t *VmaType) DefaultArg() Arg {
return MakeSpecialPointerArg(t, 0)
}
func (t *VmaType) isDefaultArg(arg Arg) bool {
a := arg.(*PointerArg)
return a.IsSpecial() && a.Address == 0
}
type BufferKind int
const (
BufferBlobRand BufferKind = iota
BufferBlobRange
BufferString
BufferFilename
BufferText
)
type TextKind int
const (
TextTarget TextKind = iota
TextX86Real
TextX86bit16
TextX86bit32
TextX86bit64
TextArm64
)
type BufferType struct {
TypeCommon
Kind BufferKind
RangeBegin uint64 // for BufferBlobRange kind
RangeEnd uint64 // for BufferBlobRange kind
Text TextKind // for BufferText
SubKind string
Values []string // possible values for BufferString kind
NoZ bool // non-zero terminated BufferString/BufferFilename
}
func (t *BufferType) String() string {
return "buffer"
}
func (t *BufferType) DefaultArg() Arg {
if t.Dir() == DirOut {
var sz uint64
if !t.Varlen() {
sz = t.Size()
}
return MakeOutDataArg(t, sz)
}
var data []byte
if !t.Varlen() {
data = make([]byte, t.Size())
}
return MakeDataArg(t, data)
}
func (t *BufferType) isDefaultArg(arg Arg) bool {
a := arg.(*DataArg)
if a.Size() == 0 {
return true
}
if a.Type().Varlen() {
return false
}
if a.Type().Dir() == DirOut {
return true
}
for _, v := range a.Data() {
if v != 0 {
return false
}
}
return true
}
type ArrayKind int
const (
ArrayRandLen ArrayKind = iota
ArrayRangeLen
)
type ArrayType struct {
TypeCommon
Type Type
Kind ArrayKind
RangeBegin uint64
RangeEnd uint64
}
func (t *ArrayType) String() string {
return fmt.Sprintf("array[%v]", t.Type.String())
}
func (t *ArrayType) DefaultArg() Arg {
var elems []Arg
if t.Kind == ArrayRangeLen && t.RangeBegin == t.RangeEnd {
for i := uint64(0); i < t.RangeBegin; i++ {
elems = append(elems, t.Type.DefaultArg())
}
}
return MakeGroupArg(t, elems)
}
func (t *ArrayType) isDefaultArg(arg Arg) bool {
a := arg.(*GroupArg)
if !a.fixedInnerSize() && len(a.Inner) != 0 {
return false
}
for _, elem := range a.Inner {
if !isDefault(elem) {
return false
}
}
return true
}
type PtrType struct {
TypeCommon
Type Type
}
func (t *PtrType) String() string {
return fmt.Sprintf("ptr[%v, %v]", t.Dir(), t.Type.String())
}
func (t *PtrType) DefaultArg() Arg {
if t.Optional() {
return MakeSpecialPointerArg(t, 0)
}
return MakePointerArg(t, 0, t.Type.DefaultArg())
}
func (t *PtrType) isDefaultArg(arg Arg) bool {
a := arg.(*PointerArg)
if t.Optional() {
return a.IsSpecial() && a.Address == 0
}
return a.Address == 0 && a.Res != nil && isDefault(a.Res)
}
type StructType struct {
Key StructKey
FldName string
*StructDesc
}
func (t *StructType) String() string {
return t.Name()
}
func (t *StructType) FieldName() string {
return t.FldName
}
func (t *StructType) DefaultArg() Arg {
inner := make([]Arg, len(t.Fields))
for i, field := range t.Fields {
inner[i] = field.DefaultArg()
}
return MakeGroupArg(t, inner)
}
func (t *StructType) isDefaultArg(arg Arg) bool {
a := arg.(*GroupArg)
for _, elem := range a.Inner {
if !isDefault(elem) {
return false
}
}
return true
}
type UnionType struct {
Key StructKey
FldName string
*StructDesc
}
func (t *UnionType) String() string {
return t.Name()
}
func (t *UnionType) FieldName() string {
return t.FldName
}
func (t *UnionType) DefaultArg() Arg {
return MakeUnionArg(t, t.Fields[0].DefaultArg())
}
func (t *UnionType) isDefaultArg(arg Arg) bool {
a := arg.(*UnionArg)
return a.Option.Type().FieldName() == t.Fields[0].FieldName() && isDefault(a.Option)
}
type StructDesc struct {
TypeCommon
Fields []Type
AlignAttr uint64
}
func (t *StructDesc) FieldName() string {
panic("must not be called")
}
type StructKey struct {
Name string
Dir Dir
}
type KeyedStruct struct {
Key StructKey
Desc *StructDesc
}
type ConstValue struct {
Name string
Value uint64
}
func ForeachType(meta *Syscall, f func(Type)) {
seen := make(map[*StructDesc]bool)
var rec func(t Type)
rec = func(t Type) {
f(t)
switch a := t.(type) {
case *PtrType:
rec(a.Type)
case *ArrayType:
rec(a.Type)
case *StructType:
if seen[a.StructDesc] {
return // prune recursion via pointers to structs/unions
}
seen[a.StructDesc] = true
for _, f := range a.Fields {
rec(f)
}
case *UnionType:
if seen[a.StructDesc] {
return // prune recursion via pointers to structs/unions
}
seen[a.StructDesc] = true
for _, opt := range a.Fields {
rec(opt)
}
case *ResourceType, *BufferType, *VmaType, *LenType,
*FlagsType, *ConstType, *IntType, *ProcType, *CsumType:
default:
panic("unknown type")
}
}
for _, t := range meta.Args {
rec(t)
}
if meta.Ret != nil {
rec(meta.Ret)
}
}