mirror of
https://github.com/reactos/syzkaller.git
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683 lines
18 KiB
Go
683 lines
18 KiB
Go
// Copyright 2017 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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package compiler
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import (
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"fmt"
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"strconv"
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"github.com/google/syzkaller/pkg/ast"
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"github.com/google/syzkaller/prog"
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)
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// typeDesc is arg/field type descriptor.
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type typeDesc struct {
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Names []string
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CanBeArg bool // can be argument of syscall?
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CantBeOpt bool // can't be marked as opt?
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CantBeRet bool // can't be syscall return (directly or indirectly)?
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NeedBase bool // needs base type when used as field?
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AllowColon bool // allow colon (int8:2) on fields?
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ResourceBase bool // can be resource base type?
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OptArgs int // number of optional arguments in Args array
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Args []namedArg // type arguments
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// Check does custom verification of the type (optional).
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Check func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon)
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// Varlen returns if the type is variable-length (false if not set).
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Varlen func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool
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// Gen generates corresponding prog.Type.
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Gen func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type
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}
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// typeArg describes a type argument.
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type typeArg struct {
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Names []string
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Kind int // int/ident/string
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AllowColon bool // allow colon (2:3)?
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// Check does custom verification of the arg (optional).
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Check func(comp *compiler, t *ast.Type)
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}
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type namedArg struct {
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Name string
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Type *typeArg
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}
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const (
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kindAny = iota
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kindInt
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kindIdent
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kindString
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)
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var typeInt = &typeDesc{
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Names: []string{"int8", "int16", "int32", "int64", "int16be", "int32be", "int64be", "intptr"},
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CanBeArg: true,
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AllowColon: true,
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ResourceBase: true,
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OptArgs: 1,
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Args: []namedArg{{"range", typeArgRange}},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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typeArgBase.Type.Check(comp, t)
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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size, be := comp.parseIntType(t.Ident)
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kind, rangeBegin, rangeEnd := prog.IntPlain, uint64(0), uint64(0)
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if len(args) > 0 {
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kind, rangeBegin, rangeEnd = prog.IntRange, args[0].Value, args[0].Value2
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}
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base.TypeSize = size
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return &prog.IntType{
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IntTypeCommon: genIntCommon(base.TypeCommon, t.Value2, be),
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Kind: kind,
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RangeBegin: rangeBegin,
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RangeEnd: rangeEnd,
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}
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},
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}
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var typePtr = &typeDesc{
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Names: []string{"ptr", "ptr64"},
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CanBeArg: true,
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Args: []namedArg{{"direction", typeArgDir}, {"type", typeArgType}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.ArgDir = prog.DirIn // pointers are always in
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base.TypeSize = comp.ptrSize
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if t.Ident == "ptr64" {
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base.TypeSize = 8
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}
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return &prog.PtrType{
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TypeCommon: base.TypeCommon,
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Type: comp.genType(args[1], "", genDir(args[0]), false),
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}
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},
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}
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var typeArray = &typeDesc{
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Names: []string{"array"},
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CantBeOpt: true,
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OptArgs: 1,
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Args: []namedArg{{"type", typeArgType}, {"size", typeArgRange}},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 1 && args[1].Value == 0 && args[1].Value2 == 0 {
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// This is the only case that can yield 0 static type size.
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comp.error(args[1].Pos, "arrays of size 0 are not supported")
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}
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},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool {
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if comp.isVarlen(args[0]) {
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return true
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}
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if len(args) > 1 {
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return args[1].Value != args[1].Value2
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}
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return true
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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elemType := comp.genType(args[0], "", base.ArgDir, false)
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kind, begin, end := prog.ArrayRandLen, uint64(0), uint64(0)
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if len(args) > 1 {
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kind, begin, end = prog.ArrayRangeLen, args[1].Value, args[1].Value2
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}
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if it, ok := elemType.(*prog.IntType); ok && it.Kind == prog.IntPlain && it.TypeSize == 1 {
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// Special case: buffer is better mutated.
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bufKind := prog.BufferBlobRand
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base.TypeSize = 0
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if kind == prog.ArrayRangeLen {
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bufKind = prog.BufferBlobRange
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if begin == end {
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base.TypeSize = begin * elemType.Size()
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}
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}
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: bufKind,
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RangeBegin: begin,
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RangeEnd: end,
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}
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}
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// TypeSize is assigned later in genStructDescs.
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return &prog.ArrayType{
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TypeCommon: base.TypeCommon,
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Type: elemType,
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Kind: kind,
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RangeBegin: begin,
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RangeEnd: end,
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}
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},
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}
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var typeLen = &typeDesc{
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Names: []string{"len", "bytesize", "bytesize2", "bytesize4", "bytesize8", "bitsize"},
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CanBeArg: true,
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CantBeOpt: true,
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CantBeRet: true,
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NeedBase: true,
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Args: []namedArg{{"len target", typeArgLenTarget}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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var bitSize uint64
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switch t.Ident {
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case "bytesize":
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bitSize = 8
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case "bytesize2", "bytesize4", "bytesize8":
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byteSize, _ := strconv.ParseUint(t.Ident[8:], 10, 8)
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bitSize = byteSize * 8
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case "bitsize":
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bitSize = 1
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}
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return &prog.LenType{
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IntTypeCommon: base,
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Buf: args[0].Ident,
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BitSize: bitSize,
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}
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},
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}
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var typeConst = &typeDesc{
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Names: []string{"const"},
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CanBeArg: true,
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CantBeOpt: true,
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NeedBase: true,
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Args: []namedArg{{"value", typeArgInt}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.ConstType{
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IntTypeCommon: base,
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Val: args[0].Value,
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}
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},
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}
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var typeArgLenTarget = &typeArg{
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Kind: kindIdent,
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}
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var typeFlags = &typeDesc{
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Names: []string{"flags"},
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CanBeArg: true,
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CantBeOpt: true,
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NeedBase: true,
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Args: []namedArg{{"flags", typeArgFlags}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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name := args[0].Ident
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base.TypeName = name
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f := comp.intFlags[name]
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if len(f.Values) == 0 {
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// We can get this if all values are unsupported consts.
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return &prog.IntType{
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IntTypeCommon: base,
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Kind: prog.IntPlain,
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}
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}
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return &prog.FlagsType{
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IntTypeCommon: base,
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Vals: genIntArray(f.Values),
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}
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},
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}
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var typeArgFlags = &typeArg{
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Kind: kindIdent,
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Check: func(comp *compiler, t *ast.Type) {
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if comp.intFlags[t.Ident] == nil {
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comp.error(t.Pos, "unknown flags %v", t.Ident)
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return
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}
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},
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}
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var typeFilename = &typeDesc{
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Names: []string{"filename"},
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CantBeOpt: true,
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool {
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return true
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = 0
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: prog.BufferFilename,
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}
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},
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}
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var typeFileoff = &typeDesc{
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Names: []string{"fileoff"},
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CanBeArg: true,
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CantBeOpt: true,
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NeedBase: true,
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.IntType{
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IntTypeCommon: base,
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Kind: prog.IntFileoff,
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}
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},
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}
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var typeVMA = &typeDesc{
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Names: []string{"vma"},
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CanBeArg: true,
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OptArgs: 1,
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Args: []namedArg{{"size range", typeArgRange}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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begin, end := uint64(0), uint64(0)
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if len(args) > 0 {
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begin, end = args[0].Value, args[0].Value2
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}
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base.TypeSize = comp.ptrSize
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return &prog.VmaType{
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TypeCommon: base.TypeCommon,
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RangeBegin: begin,
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RangeEnd: end,
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}
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},
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}
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// TODO(dvyukov): perhaps, we need something like typedefs for such types.
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// So that users can introduce them as necessary without modifying compiler:
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// type signalno int32[0:64]
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var typeSignalno = &typeDesc{
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Names: []string{"signalno"},
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CanBeArg: true,
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CantBeOpt: true,
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = 4
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return &prog.IntType{
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IntTypeCommon: base,
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Kind: prog.IntRange,
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RangeBegin: 0,
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RangeEnd: 65,
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}
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},
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}
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var typeCsum = &typeDesc{
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Names: []string{"csum"},
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NeedBase: true,
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CantBeOpt: true,
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CantBeRet: true,
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OptArgs: 1,
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Args: []namedArg{{"csum target", typeArgLenTarget}, {"kind", typeArgCsumType}, {"proto", typeArgInt}},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 2 && genCsumKind(args[1]) != prog.CsumPseudo {
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comp.error(args[2].Pos, "only pseudo csum can have proto")
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}
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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var proto uint64
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if len(args) > 2 {
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proto = args[2].Value
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}
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return &prog.CsumType{
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IntTypeCommon: base,
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Buf: args[0].Ident,
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Kind: genCsumKind(args[1]),
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Protocol: proto,
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}
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},
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}
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var typeArgCsumType = &typeArg{
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Kind: kindIdent,
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Names: []string{"inet", "pseudo"},
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}
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func genCsumKind(t *ast.Type) prog.CsumKind {
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switch t.Ident {
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case "inet":
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return prog.CsumInet
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case "pseudo":
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return prog.CsumPseudo
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default:
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panic(fmt.Sprintf("unknown csum kind %q", t.Ident))
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}
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}
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var typeProc = &typeDesc{
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Names: []string{"proc"},
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CanBeArg: true,
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NeedBase: true,
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Args: []namedArg{{"range start", typeArgInt}, {"per-proc values", typeArgInt}},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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start := args[0].Value
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perProc := args[1].Value
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if perProc == 0 {
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comp.error(args[1].Pos, "proc per-process values must not be 0")
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return
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}
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size := base.TypeSize * 8
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if size != 64 {
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const maxPids = 32 // executor knows about this constant (MAX_PIDS)
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if start >= 1<<size {
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comp.error(args[0].Pos, "values starting from %v overflow base type", start)
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} else if start+maxPids*perProc >= 1<<size {
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comp.error(args[0].Pos, "values starting from %v with step %v overflow base type for %v procs",
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start, perProc, maxPids)
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}
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}
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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return &prog.ProcType{
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IntTypeCommon: base,
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ValuesStart: args[0].Value,
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ValuesPerProc: args[1].Value,
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}
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},
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}
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var typeText = &typeDesc{
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Names: []string{"text"},
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CantBeOpt: true,
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Args: []namedArg{{"kind", typeArgTextType}},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool {
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return true
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = 0
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: prog.BufferText,
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Text: genTextType(args[0]),
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}
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},
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}
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var typeArgTextType = &typeArg{
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Kind: kindIdent,
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Names: []string{"x86_real", "x86_16", "x86_32", "x86_64", "arm64"},
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}
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func genTextType(t *ast.Type) prog.TextKind {
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switch t.Ident {
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case "x86_real":
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return prog.Text_x86_real
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case "x86_16":
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return prog.Text_x86_16
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case "x86_32":
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return prog.Text_x86_32
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case "x86_64":
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return prog.Text_x86_64
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case "arm64":
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return prog.Text_arm64
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default:
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panic(fmt.Sprintf("unknown text type %q", t.Ident))
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}
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}
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var typeBuffer = &typeDesc{
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Names: []string{"buffer"},
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CanBeArg: true,
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Args: []namedArg{{"direction", typeArgDir}},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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base.TypeSize = comp.ptrSize
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return &prog.PtrType{
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TypeCommon: base.TypeCommon,
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Type: &prog.BufferType{
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// BufferBlobRand is always varlen.
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TypeCommon: genCommon("", "", 0, genDir(args[0]), false),
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Kind: prog.BufferBlobRand,
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},
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}
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},
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}
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var typeString = &typeDesc{
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Names: []string{"string"},
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OptArgs: 2,
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Args: []namedArg{{"literal or flags", typeArgStringFlags}, {"size", typeArgInt}},
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Check: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) {
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if len(args) > 1 {
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size := args[1].Value
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vals := []string{args[0].String}
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if args[0].Ident != "" {
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vals = genStrArray(comp.strFlags[args[0].Ident].Values)
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}
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for _, s := range vals {
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s += "\x00"
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if uint64(len(s)) > size {
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comp.error(args[0].Pos, "string value %q exceeds buffer length %v",
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s, size)
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}
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}
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}
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},
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Varlen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool {
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return comp.stringSize(args) == 0
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},
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Gen: func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
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subkind := ""
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var vals []string
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if len(args) > 0 {
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if args[0].String != "" {
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vals = append(vals, args[0].String)
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} else {
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subkind = args[0].Ident
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vals = genStrArray(comp.strFlags[subkind].Values)
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}
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}
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var size uint64
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if len(args) > 1 {
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size = args[1].Value
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}
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for i, s := range vals {
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s += "\x00"
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for uint64(len(s)) < size {
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s += "\x00"
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}
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vals[i] = s
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}
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base.TypeSize = comp.stringSize(args)
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return &prog.BufferType{
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TypeCommon: base.TypeCommon,
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Kind: prog.BufferString,
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SubKind: subkind,
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Values: vals,
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}
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},
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}
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// stringSize returns static string size, or 0 if it is variable length.
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func (comp *compiler) stringSize(args []*ast.Type) uint64 {
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switch len(args) {
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case 0:
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return 0 // a random string
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case 1:
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if args[0].String != "" {
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return uint64(len(args[0].String)) + 1 // string constant
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}
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var size uint64
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for _, s := range comp.strFlags[args[0].Ident].Values {
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s1 := uint64(len(s.Value)) + 1
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if size != 0 && size != s1 {
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return 0 // strings of different lengths
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}
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size = s1
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}
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return size // all strings have the same length
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case 2:
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return args[1].Value // have explicit length
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default:
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panic("too many string args")
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}
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}
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var typeArgStringFlags = &typeArg{
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Check: func(comp *compiler, t *ast.Type) {
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if t.String == "" && t.Ident == "" {
|
|
comp.error(t.Pos, "unexpected int %v, string arg must be a string literal or string flags", t.Value)
|
|
return
|
|
}
|
|
if t.Ident != "" && comp.strFlags[t.Ident] == nil {
|
|
comp.error(t.Pos, "unknown string flags %v", t.Ident)
|
|
return
|
|
}
|
|
},
|
|
}
|
|
|
|
// typeArgType is used as placeholder for any type (e.g. ptr target type).
|
|
var typeArgType = &typeArg{
|
|
Check: func(comp *compiler, t *ast.Type) {
|
|
panic("must not be called")
|
|
},
|
|
}
|
|
|
|
var typeResource = &typeDesc{
|
|
// No Names, but compiler knows how to match it.
|
|
CanBeArg: true,
|
|
ResourceBase: true,
|
|
// Gen is assigned below to avoid initialization loop.
|
|
}
|
|
|
|
func init() {
|
|
typeResource.Gen = func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
|
// Find and generate base type to get its size.
|
|
var baseType *ast.Type
|
|
for r := comp.resources[t.Ident]; r != nil; {
|
|
baseType = r.Base
|
|
r = comp.resources[r.Base.Ident]
|
|
}
|
|
base.TypeSize = comp.genType(baseType, "", prog.DirIn, false).Size()
|
|
return &prog.ResourceType{
|
|
TypeCommon: base.TypeCommon,
|
|
}
|
|
}
|
|
}
|
|
|
|
var typeStruct = &typeDesc{
|
|
// No Names, but compiler knows how to match it.
|
|
CantBeOpt: true,
|
|
// Varlen/Gen are assigned below due to initialization cycle.
|
|
}
|
|
|
|
func init() {
|
|
typeStruct.Varlen = func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) bool {
|
|
return comp.isStructVarlen(t.Ident)
|
|
}
|
|
typeStruct.Gen = func(comp *compiler, t *ast.Type, args []*ast.Type, base prog.IntTypeCommon) prog.Type {
|
|
s := comp.structs[t.Ident]
|
|
key := prog.StructKey{t.Ident, base.ArgDir}
|
|
desc := comp.structDescs[key]
|
|
if desc == nil {
|
|
// Need to assign to structDescs before calling genStructDesc to break recursion.
|
|
desc = new(prog.StructDesc)
|
|
comp.structDescs[key] = desc
|
|
comp.genStructDesc(desc, s, base.ArgDir)
|
|
}
|
|
if s.IsUnion {
|
|
return &prog.UnionType{
|
|
Key: key,
|
|
FldName: base.FldName,
|
|
StructDesc: desc,
|
|
}
|
|
} else {
|
|
return &prog.StructType{
|
|
Key: key,
|
|
FldName: base.FldName,
|
|
StructDesc: desc,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var typeArgDir = &typeArg{
|
|
Kind: kindIdent,
|
|
Names: []string{"in", "out", "inout"},
|
|
}
|
|
|
|
func genDir(t *ast.Type) prog.Dir {
|
|
switch t.Ident {
|
|
case "in":
|
|
return prog.DirIn
|
|
case "out":
|
|
return prog.DirOut
|
|
case "inout":
|
|
return prog.DirInOut
|
|
default:
|
|
panic(fmt.Sprintf("unknown direction %q", t.Ident))
|
|
}
|
|
}
|
|
|
|
var typeArgInt = &typeArg{
|
|
Kind: kindInt,
|
|
}
|
|
|
|
var typeArgRange = &typeArg{
|
|
Kind: kindInt,
|
|
AllowColon: true,
|
|
Check: func(comp *compiler, t *ast.Type) {
|
|
if !t.HasColon {
|
|
t.Value2 = t.Value
|
|
}
|
|
if t.Value > t.Value2 {
|
|
comp.error(t.Pos, "bad int range [%v:%v]", t.Value, t.Value2)
|
|
}
|
|
},
|
|
}
|
|
|
|
// Base type of const/len/etc. Same as typeInt, but can't have range.
|
|
var typeArgBase = namedArg{
|
|
Name: "base type",
|
|
Type: &typeArg{
|
|
Names: []string{"int8", "int16", "int32", "int64", "int16be", "int32be", "int64be", "intptr"},
|
|
AllowColon: true,
|
|
Check: func(comp *compiler, t *ast.Type) {
|
|
if t.HasColon {
|
|
if t.Value2 == 0 {
|
|
// This was not supported historically
|
|
// and does not work the way C bitfields of size 0 work.
|
|
// We could allow this, but then we need to make
|
|
// this work the way C bitfields work.
|
|
comp.error(t.Pos2, "bitfields of size 0 are not supported")
|
|
}
|
|
size, _ := comp.parseIntType(t.Ident)
|
|
if t.Value2 > size*8 {
|
|
comp.error(t.Pos2, "bitfield of size %v is too large for base type of size %v",
|
|
t.Value2, size*8)
|
|
}
|
|
}
|
|
},
|
|
},
|
|
}
|
|
|
|
var (
|
|
builtinTypes = make(map[string]*typeDesc)
|
|
|
|
// To avoid weird cases like ptr[in, in] and ptr[out, opt].
|
|
reservedName = map[string]bool{
|
|
"opt": true,
|
|
"in": true,
|
|
"out": true,
|
|
"inout": true,
|
|
}
|
|
)
|
|
|
|
func init() {
|
|
builtins := []*typeDesc{
|
|
typeInt,
|
|
typePtr,
|
|
typeArray,
|
|
typeLen,
|
|
typeConst,
|
|
typeFlags,
|
|
typeFilename,
|
|
typeFileoff,
|
|
typeVMA,
|
|
typeSignalno,
|
|
typeCsum,
|
|
typeProc,
|
|
typeText,
|
|
typeBuffer,
|
|
typeString,
|
|
typeResource,
|
|
typeStruct,
|
|
}
|
|
for _, desc := range builtins {
|
|
for _, name := range desc.Names {
|
|
if builtinTypes[name] != nil {
|
|
panic(fmt.Sprintf("duplicate builtin type %q", name))
|
|
}
|
|
builtinTypes[name] = desc
|
|
}
|
|
}
|
|
}
|