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dadgam3er
2024-09-19 21:38:24 -04:00
commit d0ae4d841d
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go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/README.md
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This code is a copied and slightly modified version of go/src/debug/gosym.
The original code contains logic for accessing symbol tables and line numbers
in Go binaries. The only reason why this is copied is to support inlining.
Code added by vulncheck is located in files with "additions_" prefix and it
contains logic for accessing inlining information.
Within the originally named files, deleted or added logic is annotated with
a comment starting with "Addition:". The modified logic allows the inlining
code in "additions_*" files to access the necessary information.
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/additions.go
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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gosym
import (
"encoding/binary"
"io"
"strings"
sv "golang.org/x/mod/semver"
"golang.org/x/vuln/internal/semver"
)
const (
funcSymNameGo119Lower string = "go.func.*"
funcSymNameGo120 string = "go:func.*"
)
// FuncSymName returns symbol name for Go functions used in binaries
// based on Go version. Supported Go versions are 1.18 and greater.
// If the go version is unreadable it assumes that it is a newer version
// and returns the symbol name for go version 1.20 or greater.
func FuncSymName(goVersion string) string {
// Support devel goX.Y...
v := strings.TrimPrefix(goVersion, "devel ")
v = semver.GoTagToSemver(v)
mm := sv.MajorMinor(v)
if sv.Compare(mm, "v1.20") >= 0 || mm == "" {
return funcSymNameGo120
} else if sv.Compare(mm, "v1.18") >= 0 {
return funcSymNameGo119Lower
}
return ""
}
// Additions to the original package from cmd/internal/objabi/funcdata.go
const (
pcdata_InlTreeIndex = 2
funcdata_InlTree = 3
)
// InlineTree returns the inline tree for Func f as a sequence of InlinedCalls.
// goFuncValue is the value of the gosym.FuncSymName symbol.
// baseAddr is the address of the memory region (ELF Prog) containing goFuncValue.
// progReader is a ReaderAt positioned at the start of that region.
func (t *LineTable) InlineTree(f *Func, goFuncValue, baseAddr uint64, progReader io.ReaderAt) ([]InlinedCall, error) {
if f.inlineTreeCount == 0 {
return nil, nil
}
if f.inlineTreeOffset == ^uint32(0) {
return nil, nil
}
var offset int64
if t.version >= ver118 {
offset = int64(goFuncValue - baseAddr + uint64(f.inlineTreeOffset))
} else {
offset = int64(uint64(f.inlineTreeOffset) - baseAddr)
}
r := io.NewSectionReader(progReader, offset, 1<<32) // pick a size larger than we need
var ics []InlinedCall
for i := 0; i < f.inlineTreeCount; i++ {
if t.version >= ver120 {
var ric rawInlinedCall120
if err := binary.Read(r, t.binary, &ric); err != nil {
return nil, err
}
ics = append(ics, InlinedCall{
FuncID: ric.FuncID,
Name: t.funcName(uint32(ric.NameOff)),
ParentPC: ric.ParentPC,
})
} else {
var ric rawInlinedCall112
if err := binary.Read(r, t.binary, &ric); err != nil {
return nil, err
}
ics = append(ics, InlinedCall{
FuncID: ric.FuncID,
Name: t.funcName(uint32(ric.Func_)),
ParentPC: ric.ParentPC,
})
}
}
return ics, nil
}
// InlinedCall describes a call to an inlined function.
type InlinedCall struct {
FuncID uint8 // type of the called function
Name string // name of called function
ParentPC int32 // position of an instruction whose source position is the call site (offset from entry)
}
// rawInlinedCall112 is the encoding of entries in the FUNCDATA_InlTree table
// from Go 1.12 through 1.19. It is equivalent to runtime.inlinedCall.
type rawInlinedCall112 struct {
Parent int16 // index of parent in the inltree, or < 0
FuncID uint8 // type of the called function
_ byte
File int32 // perCU file index for inlined call. See cmd/link:pcln.go
Line int32 // line number of the call site
Func_ int32 // offset into pclntab for name of called function
ParentPC int32 // position of an instruction whose source position is the call site (offset from entry)
}
// rawInlinedCall120 is the encoding of entries in the FUNCDATA_InlTree table
// from Go 1.20. It is equivalent to runtime.inlinedCall.
type rawInlinedCall120 struct {
FuncID uint8 // type of the called function
_ [3]byte
NameOff int32 // offset into pclntab for name of called function
ParentPC int32 // position of an instruction whose source position is the call site (offset from entry)
StartLine int32 // line number of start of function (func keyword/TEXT directive)
}
func (f funcData) npcdata() uint32 { return f.field(7) }
func (f funcData) nfuncdata(numFuncFields uint32) uint32 {
return uint32(f.data[f.fieldOffset(numFuncFields-1)+3])
}
func (f funcData) funcdataOffset(i uint8, numFuncFields uint32) uint32 {
if uint32(i) >= f.nfuncdata(numFuncFields) {
return ^uint32(0)
}
var off uint32
if f.t.version >= ver118 {
off = f.fieldOffset(numFuncFields) + // skip fixed part of _func
f.npcdata()*4 + // skip pcdata
uint32(i)*4 // index of i'th FUNCDATA
} else {
off = f.fieldOffset(numFuncFields) + // skip fixed part of _func
f.npcdata()*4
off += uint32(i) * f.t.ptrsize
}
return f.t.binary.Uint32(f.data[off:])
}
func (f funcData) fieldOffset(n uint32) uint32 {
// In Go 1.18, the first field of _func changed
// from a uintptr entry PC to a uint32 entry offset.
sz0 := f.t.ptrsize
if f.t.version >= ver118 {
sz0 = 4
}
return sz0 + (n-1)*4 // subsequent fields are 4 bytes each
}
func (f funcData) pcdataOffset(i uint8, numFuncFields uint32) uint32 {
if uint32(i) >= f.npcdata() {
return ^uint32(0)
}
off := f.fieldOffset(numFuncFields) + // skip fixed part of _func
uint32(i)*4 // index of i'th PCDATA
return f.t.binary.Uint32(f.data[off:])
}
// maxInlineTreeIndexValue returns the maximum value of the inline tree index
// pc-value table in info. This is the only way to determine how many
// IndexedCalls are in an inline tree, since the data of the tree itself is not
// delimited in any way.
func (t *LineTable) maxInlineTreeIndexValue(info funcData, numFuncFields uint32) int {
if info.npcdata() <= pcdata_InlTreeIndex {
return -1
}
off := info.pcdataOffset(pcdata_InlTreeIndex, numFuncFields)
p := t.pctab[off:]
val := int32(-1)
max := int32(-1)
var pc uint64
for t.step(&p, &pc, &val, pc == 0) {
if val > max {
max = val
}
}
return int(max)
}
type inlTree struct {
inlineTreeOffset uint32 // offset from go.func.* symbol
inlineTreeCount int // number of entries in inline tree
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/additions_test.go
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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gosym
import (
"debug/elf"
"runtime"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
)
func TestFuncSymName(t *testing.T) {
for _, test := range []struct {
v string
want string
}{
{"go1.15", ""},
{"go1.18", funcSymNameGo119Lower},
{"go1.19", funcSymNameGo119Lower},
{"devel go1.19", funcSymNameGo119Lower},
{"go1.19-pre4", funcSymNameGo119Lower},
{"go1.20", funcSymNameGo120},
{"devel bd56cb90a72e6725e", funcSymNameGo120},
{"go1.21", funcSymNameGo120},
{"unknown version", funcSymNameGo120},
} {
if got := FuncSymName(test.v); got != test.want {
t.Errorf("got %s; want %s", got, test.want)
}
}
}
func TestInlineTree(t *testing.T) {
t.Skip("to temporarily resolve #61511")
pclinetestBinary, cleanup := dotest(t)
defer cleanup()
f, err := elf.Open(pclinetestBinary)
if err != nil {
t.Fatal(err)
}
defer f.Close()
pclndat, err := f.Section(".gopclntab").Data()
if err != nil {
t.Fatalf("reading %s gopclntab: %v", pclinetestBinary, err)
}
// The test binaries will be compiled with the same Go version
// used to run the tests.
goFunc := lookupSymbol(f, FuncSymName(runtime.Version()))
if goFunc == nil {
t.Fatal("couldn't find go.func.*")
}
prog := progContaining(f, goFunc.Value)
if prog == nil {
t.Fatal("couldn't find go.func.* Prog")
}
pcln := NewLineTable(pclndat, f.Section(".text").Addr)
s := f.Section(".gosymtab")
if s == nil {
t.Fatal("no .gosymtab section")
}
d, err := s.Data()
if err != nil {
t.Fatal(err)
}
tab, err := NewTable(d, pcln)
if err != nil {
t.Fatal(err)
}
fun := tab.LookupFunc("main.main")
got, err := pcln.InlineTree(fun, goFunc.Value, prog.Vaddr, prog.ReaderAt)
if err != nil {
t.Fatal(err)
}
want := []InlinedCall{
{FuncID: 0, Name: "main.inline1"},
{FuncID: 0, Name: "main.inline2"},
}
if !cmp.Equal(got, want, cmpopts.IgnoreFields(InlinedCall{}, "ParentPC")) {
t.Errorf("got\n%+v\nwant\n%+v", got, want)
}
}
func progContaining(f *elf.File, addr uint64) *elf.Prog {
for _, p := range f.Progs {
if addr >= p.Vaddr && addr < p.Vaddr+p.Filesz {
return p
}
}
return nil
}
func lookupSymbol(f *elf.File, name string) *elf.Symbol {
syms, err := f.Symbols()
if err != nil {
return nil
}
for _, s := range syms {
if s.Name == name {
return &s
}
}
return nil
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/pclntab.go
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
* Line tables
*/
package gosym
import (
"bytes"
"encoding/binary"
"sort"
"sync"
)
// version of the pclntab
type version int
const (
verUnknown version = iota
ver11
ver12
ver116
ver118
ver120
)
// A LineTable is a data structure mapping program counters to line numbers.
//
// In Go 1.1 and earlier, each function (represented by a Func) had its own LineTable,
// and the line number corresponded to a numbering of all source lines in the
// program, across all files. That absolute line number would then have to be
// converted separately to a file name and line number within the file.
//
// In Go 1.2, the format of the data changed so that there is a single LineTable
// for the entire program, shared by all Funcs, and there are no absolute line
// numbers, just line numbers within specific files.
//
// For the most part, LineTable's methods should be treated as an internal
// detail of the package; callers should use the methods on Table instead.
type LineTable struct {
Data []byte
PC uint64
Line int
// This mutex is used to keep parsing of pclntab synchronous.
mu sync.Mutex
// Contains the version of the pclntab section.
version version
// Go 1.2/1.16/1.18 state
binary binary.ByteOrder
quantum uint32
ptrsize uint32
textStart uint64 // address of runtime.text symbol (1.18+)
funcnametab []byte
cutab []byte
funcdata []byte
functab []byte
nfunctab uint32
filetab []byte
pctab []byte // points to the pctables.
nfiletab uint32
funcNames map[uint32]string // cache the function names
strings map[uint32]string // interned substrings of Data, keyed by offset
// fileMap varies depending on the version of the object file.
// For ver12, it maps the name to the index in the file table.
// For ver116, it maps the name to the offset in filetab.
fileMap map[string]uint32
}
// NOTE(rsc): This is wrong for GOARCH=arm, which uses a quantum of 4,
// but we have no idea whether we're using arm or not. This only
// matters in the old (pre-Go 1.2) symbol table format, so it's not worth
// fixing.
const oldQuantum = 1
func (t *LineTable) parse(targetPC uint64, targetLine int) (b []byte, pc uint64, line int) {
// The PC/line table can be thought of as a sequence of
// <pc update>* <line update>
// batches. Each update batch results in a (pc, line) pair,
// where line applies to every PC from pc up to but not
// including the pc of the next pair.
//
// Here we process each update individually, which simplifies
// the code, but makes the corner cases more confusing.
b, pc, line = t.Data, t.PC, t.Line
for pc <= targetPC && line != targetLine && len(b) > 0 {
code := b[0]
b = b[1:]
switch {
case code == 0:
if len(b) < 4 {
b = b[0:0]
break
}
val := binary.BigEndian.Uint32(b)
b = b[4:]
line += int(val)
case code <= 64:
line += int(code)
case code <= 128:
line -= int(code - 64)
default:
pc += oldQuantum * uint64(code-128)
continue
}
pc += oldQuantum
}
return b, pc, line
}
func (t *LineTable) slice(pc uint64) *LineTable {
data, pc, line := t.parse(pc, -1)
return &LineTable{Data: data, PC: pc, Line: line}
}
// PCToLine returns the line number for the given program counter.
//
// Deprecated: Use Table's PCToLine method instead.
func (t *LineTable) PCToLine(pc uint64) int {
if t.isGo12() {
return t.go12PCToLine(pc)
}
_, _, line := t.parse(pc, -1)
return line
}
// LineToPC returns the program counter for the given line number,
// considering only program counters before maxpc.
//
// Deprecated: Use Table's LineToPC method instead.
func (t *LineTable) LineToPC(line int, maxpc uint64) uint64 {
if t.isGo12() {
return 0
}
_, pc, line1 := t.parse(maxpc, line)
if line1 != line {
return 0
}
// Subtract quantum from PC to account for post-line increment
return pc - oldQuantum
}
// NewLineTable returns a new PC/line table
// corresponding to the encoded data.
// Text must be the start address of the
// corresponding text segment.
func NewLineTable(data []byte, text uint64) *LineTable {
return &LineTable{Data: data, PC: text, Line: 0, funcNames: make(map[uint32]string), strings: make(map[uint32]string)}
}
// Go 1.2 symbol table format.
// See golang.org/s/go12symtab.
//
// A general note about the methods here: rather than try to avoid
// index out of bounds errors, we trust Go to detect them, and then
// we recover from the panics and treat them as indicative of a malformed
// or incomplete table.
//
// The methods called by symtab.go, which begin with "go12" prefixes,
// are expected to have that recovery logic.
// isGo12 reports whether this is a Go 1.2 (or later) symbol table.
func (t *LineTable) isGo12() bool {
t.parsePclnTab()
return t.version >= ver12
}
const (
go12magic = 0xfffffffb
go116magic = 0xfffffffa
go118magic = 0xfffffff0
go120magic = 0xfffffff1
)
// uintptr returns the pointer-sized value encoded at b.
// The pointer size is dictated by the table being read.
func (t *LineTable) uintptr(b []byte) uint64 {
if t.ptrsize == 4 {
return uint64(t.binary.Uint32(b))
}
return t.binary.Uint64(b)
}
// parsePclnTab parses the pclntab, setting the version.
func (t *LineTable) parsePclnTab() {
t.mu.Lock()
defer t.mu.Unlock()
if t.version != verUnknown {
return
}
// Note that during this function, setting the version is the last thing we do.
// If we set the version too early, and parsing failed (likely as a panic on
// slice lookups), we'd have a mistaken version.
//
// Error paths through this code will default the version to 1.1.
t.version = ver11
if !disableRecover {
defer func() {
// If we panic parsing, assume it's a Go 1.1 pclntab.
_ = recover()
}()
}
// Check header: 4-byte magic, two zeros, pc quantum, pointer size.
if len(t.Data) < 16 || t.Data[4] != 0 || t.Data[5] != 0 ||
(t.Data[6] != 1 && t.Data[6] != 2 && t.Data[6] != 4) || // pc quantum
(t.Data[7] != 4 && t.Data[7] != 8) { // pointer size
return
}
var possibleVersion version
leMagic := binary.LittleEndian.Uint32(t.Data)
beMagic := binary.BigEndian.Uint32(t.Data)
switch {
case leMagic == go12magic:
t.binary, possibleVersion = binary.LittleEndian, ver12
case beMagic == go12magic:
t.binary, possibleVersion = binary.BigEndian, ver12
case leMagic == go116magic:
t.binary, possibleVersion = binary.LittleEndian, ver116
case beMagic == go116magic:
t.binary, possibleVersion = binary.BigEndian, ver116
case leMagic == go118magic:
t.binary, possibleVersion = binary.LittleEndian, ver118
case beMagic == go118magic:
t.binary, possibleVersion = binary.BigEndian, ver118
case leMagic == go120magic:
t.binary, possibleVersion = binary.LittleEndian, ver120
case beMagic == go120magic:
t.binary, possibleVersion = binary.BigEndian, ver120
default:
return
}
t.version = possibleVersion
// quantum and ptrSize are the same between 1.2, 1.16, and 1.18
t.quantum = uint32(t.Data[6])
t.ptrsize = uint32(t.Data[7])
offset := func(word uint32) uint64 {
return t.uintptr(t.Data[8+word*t.ptrsize:])
}
data := func(word uint32) []byte {
return t.Data[offset(word):]
}
switch possibleVersion {
case ver118, ver120:
t.nfunctab = uint32(offset(0))
t.nfiletab = uint32(offset(1))
t.textStart = t.PC // use the start PC instead of reading from the table, which may be unrelocated
t.funcnametab = data(3)
t.cutab = data(4)
t.filetab = data(5)
t.pctab = data(6)
t.funcdata = data(7)
t.functab = data(7)
functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize()
t.functab = t.functab[:functabsize]
case ver116:
t.nfunctab = uint32(offset(0))
t.nfiletab = uint32(offset(1))
t.funcnametab = data(2)
t.cutab = data(3)
t.filetab = data(4)
t.pctab = data(5)
t.funcdata = data(6)
t.functab = data(6)
functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize()
t.functab = t.functab[:functabsize]
case ver12:
t.nfunctab = uint32(t.uintptr(t.Data[8:]))
t.funcdata = t.Data
t.funcnametab = t.Data
t.functab = t.Data[8+t.ptrsize:]
t.pctab = t.Data
functabsize := (int(t.nfunctab)*2 + 1) * t.functabFieldSize()
fileoff := t.binary.Uint32(t.functab[functabsize:])
t.functab = t.functab[:functabsize]
t.filetab = t.Data[fileoff:]
t.nfiletab = t.binary.Uint32(t.filetab)
t.filetab = t.filetab[:t.nfiletab*4]
default:
panic("unreachable")
}
}
// go12Funcs returns a slice of Funcs derived from the Go 1.2+ pcln table.
func (t *LineTable) go12Funcs() []Func {
// Assume it is malformed and return nil on error.
if !disableRecover {
defer func() {
_ = recover()
}()
}
ft := t.funcTab()
funcs := make([]Func, ft.Count())
syms := make([]Sym, len(funcs))
for i := range funcs {
f := &funcs[i]
f.Entry = ft.pc(i)
f.End = ft.pc(i + 1)
info := t.funcData(uint32(i))
f.LineTable = t
f.FrameSize = int(info.deferreturn())
// Additions:
// numFuncField is the number of (32 bit) fields in _func (src/runtime/runtime2.go)
// Note that the last 4 fields are 32 bits combined. This number is 11 for go1.20,
// 10 for earlier versions down to go1.16, and 9 before that.
var numFuncFields uint32 = 11
if t.version < ver116 {
numFuncFields = 9
} else if t.version < ver120 {
numFuncFields = 10
}
f.inlineTreeOffset = info.funcdataOffset(funcdata_InlTree, numFuncFields)
f.inlineTreeCount = 1 + t.maxInlineTreeIndexValue(info, numFuncFields)
syms[i] = Sym{
Value: f.Entry,
Type: 'T',
Name: t.funcName(info.nameOff()),
GoType: 0,
Func: f,
goVersion: t.version,
}
f.Sym = &syms[i]
}
return funcs
}
// findFunc returns the funcData corresponding to the given program counter.
func (t *LineTable) findFunc(pc uint64) funcData {
ft := t.funcTab()
if pc < ft.pc(0) || pc >= ft.pc(ft.Count()) {
return funcData{}
}
idx := sort.Search(int(t.nfunctab), func(i int) bool {
return ft.pc(i) > pc
})
idx--
return t.funcData(uint32(idx))
}
// readvarint reads, removes, and returns a varint from *pp.
func (t *LineTable) readvarint(pp *[]byte) uint32 {
var v, shift uint32
p := *pp
for shift = 0; ; shift += 7 {
b := p[0]
p = p[1:]
v |= (uint32(b) & 0x7F) << shift
if b&0x80 == 0 {
break
}
}
*pp = p
return v
}
// funcName returns the name of the function found at off.
func (t *LineTable) funcName(off uint32) string {
if s, ok := t.funcNames[off]; ok {
return s
}
i := bytes.IndexByte(t.funcnametab[off:], 0)
s := string(t.funcnametab[off : off+uint32(i)])
t.funcNames[off] = s
return s
}
// stringFrom returns a Go string found at off from a position.
func (t *LineTable) stringFrom(arr []byte, off uint32) string {
if s, ok := t.strings[off]; ok {
return s
}
i := bytes.IndexByte(arr[off:], 0)
s := string(arr[off : off+uint32(i)])
t.strings[off] = s
return s
}
// string returns a Go string found at off.
func (t *LineTable) string(off uint32) string {
return t.stringFrom(t.funcdata, off)
}
// functabFieldSize returns the size in bytes of a single functab field.
func (t *LineTable) functabFieldSize() int {
if t.version >= ver118 {
return 4
}
return int(t.ptrsize)
}
// funcTab returns t's funcTab.
func (t *LineTable) funcTab() funcTab {
return funcTab{LineTable: t, sz: t.functabFieldSize()}
}
// funcTab is memory corresponding to a slice of functab structs, followed by an invalid PC.
// A functab struct is a PC and a func offset.
type funcTab struct {
*LineTable
sz int // cached result of t.functabFieldSize
}
// Count returns the number of func entries in f.
func (f funcTab) Count() int {
return int(f.nfunctab)
}
// pc returns the PC of the i'th func in f.
func (f funcTab) pc(i int) uint64 {
u := f.uint(f.functab[2*i*f.sz:])
if f.version >= ver118 {
u += f.textStart
}
return u
}
// funcOff returns the funcdata offset of the i'th func in f.
func (f funcTab) funcOff(i int) uint64 {
return f.uint(f.functab[(2*i+1)*f.sz:])
}
// uint returns the uint stored at b.
func (f funcTab) uint(b []byte) uint64 {
if f.sz == 4 {
return uint64(f.binary.Uint32(b))
}
return f.binary.Uint64(b)
}
// funcData is memory corresponding to an _func struct.
type funcData struct {
t *LineTable // LineTable this data is a part of
data []byte // raw memory for the function
}
// funcData returns the ith funcData in t.functab.
func (t *LineTable) funcData(i uint32) funcData {
data := t.funcdata[t.funcTab().funcOff(int(i)):]
return funcData{t: t, data: data}
}
// IsZero reports whether f is the zero value.
func (f funcData) IsZero() bool {
return f.t == nil && f.data == nil
}
// entryPC returns the func's entry PC.
func (f *funcData) entryPC() uint64 {
// In Go 1.18, the first field of _func changed
// from a uintptr entry PC to a uint32 entry offset.
if f.t.version >= ver118 {
// TODO: support multiple text sections.
// See runtime/symtab.go:(*moduledata).textAddr.
return uint64(f.t.binary.Uint32(f.data)) + f.t.textStart
}
return f.t.uintptr(f.data)
}
func (f funcData) nameOff() uint32 { return f.field(1) }
func (f funcData) deferreturn() uint32 { return f.field(3) }
func (f funcData) pcfile() uint32 { return f.field(5) }
func (f funcData) pcln() uint32 { return f.field(6) }
func (f funcData) cuOffset() uint32 { return f.field(8) }
// field returns the nth field of the _func struct.
// It panics if n == 0 or n > 9; for n == 0, call f.entryPC.
// Most callers should use a named field accessor (just above).
func (f funcData) field(n uint32) uint32 {
if n == 0 || n > 9 {
panic("bad funcdata field")
}
// Addition: some code deleted here to support inlining.
off := f.fieldOffset(n)
data := f.data[off:]
return f.t.binary.Uint32(data)
}
// step advances to the next pc, value pair in the encoded table.
func (t *LineTable) step(p *[]byte, pc *uint64, val *int32, first bool) bool {
uvdelta := t.readvarint(p)
if uvdelta == 0 && !first {
return false
}
if uvdelta&1 != 0 {
uvdelta = ^(uvdelta >> 1)
} else {
uvdelta >>= 1
}
vdelta := int32(uvdelta)
pcdelta := t.readvarint(p) * t.quantum
*pc += uint64(pcdelta)
*val += vdelta
return true
}
// pcvalue reports the value associated with the target pc.
// off is the offset to the beginning of the pc-value table,
// and entry is the start PC for the corresponding function.
func (t *LineTable) pcvalue(off uint32, entry, targetpc uint64) int32 {
p := t.pctab[off:]
val := int32(-1)
pc := entry
for t.step(&p, &pc, &val, pc == entry) {
if targetpc < pc {
return val
}
}
return -1
}
// findFileLine scans one function in the binary looking for a
// program counter in the given file on the given line.
// It does so by running the pc-value tables mapping program counter
// to file number. Since most functions come from a single file, these
// are usually short and quick to scan. If a file match is found, then the
// code goes to the expense of looking for a simultaneous line number match.
func (t *LineTable) findFileLine(entry uint64, filetab, linetab uint32, filenum, line int32, cutab []byte) uint64 {
if filetab == 0 || linetab == 0 {
return 0
}
fp := t.pctab[filetab:]
fl := t.pctab[linetab:]
fileVal := int32(-1)
filePC := entry
lineVal := int32(-1)
linePC := entry
fileStartPC := filePC
for t.step(&fp, &filePC, &fileVal, filePC == entry) {
fileIndex := fileVal
if t.version == ver116 || t.version == ver118 || t.version == ver120 {
fileIndex = int32(t.binary.Uint32(cutab[fileVal*4:]))
}
if fileIndex == filenum && fileStartPC < filePC {
// fileIndex is in effect starting at fileStartPC up to
// but not including filePC, and it's the file we want.
// Run the PC table looking for a matching line number
// or until we reach filePC.
lineStartPC := linePC
for linePC < filePC && t.step(&fl, &linePC, &lineVal, linePC == entry) {
// lineVal is in effect until linePC, and lineStartPC < filePC.
if lineVal == line {
if fileStartPC <= lineStartPC {
return lineStartPC
}
if fileStartPC < linePC {
return fileStartPC
}
}
lineStartPC = linePC
}
}
fileStartPC = filePC
}
return 0
}
// go12PCToLine maps program counter to line number for the Go 1.2+ pcln table.
func (t *LineTable) go12PCToLine(pc uint64) (line int) {
defer func() {
if !disableRecover && recover() != nil {
line = -1
}
}()
f := t.findFunc(pc)
if f.IsZero() {
return -1
}
entry := f.entryPC()
linetab := f.pcln()
return int(t.pcvalue(linetab, entry, pc))
}
// go12PCToFile maps program counter to file name for the Go 1.2+ pcln table.
func (t *LineTable) go12PCToFile(pc uint64) (file string) {
defer func() {
if !disableRecover && recover() != nil {
file = ""
}
}()
f := t.findFunc(pc)
if f.IsZero() {
return ""
}
entry := f.entryPC()
filetab := f.pcfile()
fno := t.pcvalue(filetab, entry, pc)
if t.version == ver12 {
if fno <= 0 {
return ""
}
return t.string(t.binary.Uint32(t.filetab[4*fno:]))
}
// Go ≥ 1.16
if fno < 0 { // 0 is valid for ≥ 1.16
return ""
}
cuoff := f.cuOffset()
if fnoff := t.binary.Uint32(t.cutab[(cuoff+uint32(fno))*4:]); fnoff != ^uint32(0) {
return t.stringFrom(t.filetab, fnoff)
}
return ""
}
// go12LineToPC maps a (file, line) pair to a program counter for the Go 1.2+ pcln table.
func (t *LineTable) go12LineToPC(file string, line int) (pc uint64) {
defer func() {
if !disableRecover && recover() != nil {
pc = 0
}
}()
t.initFileMap()
filenum, ok := t.fileMap[file]
if !ok {
return 0
}
// Scan all functions.
// If this turns out to be a bottleneck, we could build a map[int32][]int32
// mapping file number to a list of functions with code from that file.
var cutab []byte
for i := uint32(0); i < t.nfunctab; i++ {
f := t.funcData(i)
entry := f.entryPC()
filetab := f.pcfile()
linetab := f.pcln()
if t.version == ver116 || t.version == ver118 || t.version == ver120 {
if f.cuOffset() == ^uint32(0) {
// skip functions without compilation unit (not real function, or linker generated)
continue
}
cutab = t.cutab[f.cuOffset()*4:]
}
pc := t.findFileLine(entry, filetab, linetab, int32(filenum), int32(line), cutab)
if pc != 0 {
return pc
}
}
return 0
}
// initFileMap initializes the map from file name to file number.
func (t *LineTable) initFileMap() {
t.mu.Lock()
defer t.mu.Unlock()
if t.fileMap != nil {
return
}
m := make(map[string]uint32)
if t.version == ver12 {
for i := uint32(1); i < t.nfiletab; i++ {
s := t.string(t.binary.Uint32(t.filetab[4*i:]))
m[s] = i
}
} else {
var pos uint32
for i := uint32(0); i < t.nfiletab; i++ {
s := t.stringFrom(t.filetab, pos)
m[s] = pos
pos += uint32(len(s) + 1)
}
}
t.fileMap = m
}
// go12MapFiles adds to m a key for every file in the Go 1.2 LineTable.
// Every key maps to obj. That's not a very interesting map, but it provides
// a way for callers to obtain the list of files in the program.
func (t *LineTable) go12MapFiles(m map[string]*Obj, obj *Obj) {
if !disableRecover {
defer func() {
_ = recover()
}()
}
t.initFileMap()
for file := range t.fileMap {
m[file] = obj
}
}
// disableRecover causes this package not to swallow panics.
// This is useful when making changes.
const disableRecover = true
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/pclntab_test.go
+382
View File
@@ -0,0 +1,382 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gosym
import (
"bytes"
"compress/gzip"
"debug/elf"
"io"
"os"
"runtime"
"strings"
"testing"
"golang.org/x/vuln/internal/test"
"golang.org/x/vuln/internal/testenv"
)
func dotest(t *testing.T) (binaryName string, cleanup func()) {
testenv.NeedsGoBuild(t)
// For now, only works on amd64 platforms.
if runtime.GOARCH != "amd64" {
t.Skipf("skipping on non-AMD64 system %s", runtime.GOARCH)
}
// This test builds a Linux/AMD64 binary. Skipping in short mode if cross compiling.
if runtime.GOOS != "linux" && testing.Short() {
t.Skipf("skipping in short mode on non-Linux system %s", runtime.GOARCH)
}
return test.GoBuild(t, "testdata", "", false, "GOOS", "linux")
}
// skipIfNotELF skips the test if we are not running on an ELF system.
// These tests open and examine the test binary, and use elf.Open to do so.
func skipIfNotELF(t *testing.T) {
switch runtime.GOOS {
case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris", "illumos":
// OK.
default:
t.Skipf("skipping on non-ELF system %s", runtime.GOOS)
}
}
func getTable(t *testing.T) *Table {
f, tab := crack(os.Args[0], t)
f.Close()
return tab
}
func crack(file string, t *testing.T) (*elf.File, *Table) {
// Open self
f, err := elf.Open(file)
if err != nil {
t.Fatal(err)
}
return parse(file, f, t)
}
func parse(file string, f *elf.File, t *testing.T) (*elf.File, *Table) {
s := f.Section(".gosymtab")
if s == nil {
t.Skip("no .gosymtab section")
}
symdat, err := s.Data()
if err != nil {
f.Close()
t.Fatalf("reading %s gosymtab: %v", file, err)
}
pclndat, err := f.Section(".gopclntab").Data()
if err != nil {
f.Close()
t.Fatalf("reading %s gopclntab: %v", file, err)
}
pcln := NewLineTable(pclndat, f.Section(".text").Addr)
tab, err := NewTable(symdat, pcln)
if err != nil {
f.Close()
t.Fatalf("parsing %s gosymtab: %v", file, err)
}
return f, tab
}
func TestLineFromAline(t *testing.T) {
skipIfNotELF(t)
tab := getTable(t)
if tab.go12line != nil {
// aline's don't exist in the Go 1.2 table.
t.Skip("not relevant to Go 1.2 symbol table")
}
// Find the sym package
pkg := tab.LookupFunc("debug/gosym.TestLineFromAline").Obj
if pkg == nil {
t.Fatalf("nil pkg")
}
// Walk every absolute line and ensure that we hit every
// source line monotonically
lastline := make(map[string]int)
final := -1
for i := 0; i < 10000; i++ {
path, line := pkg.lineFromAline(i)
// Check for end of object
if path == "" {
if final == -1 {
final = i - 1
}
continue
} else if final != -1 {
t.Fatalf("reached end of package at absolute line %d, but absolute line %d mapped to %s:%d", final, i, path, line)
}
// It's okay to see files multiple times (e.g., sys.a)
if line == 1 {
lastline[path] = 1
continue
}
// Check that the is the next line in path
ll, ok := lastline[path]
if !ok {
t.Errorf("file %s starts on line %d", path, line)
} else if line != ll+1 {
t.Fatalf("expected next line of file %s to be %d, got %d", path, ll+1, line)
}
lastline[path] = line
}
if final == -1 {
t.Errorf("never reached end of object")
}
}
func TestLineAline(t *testing.T) {
skipIfNotELF(t)
tab := getTable(t)
if tab.go12line != nil {
// aline's don't exist in the Go 1.2 table.
t.Skip("not relevant to Go 1.2 symbol table")
}
for _, o := range tab.Files {
// A source file can appear multiple times in a
// object. alineFromLine will always return alines in
// the first file, so track which lines we've seen.
found := make(map[string]int)
for i := 0; i < 1000; i++ {
path, line := o.lineFromAline(i)
if path == "" {
break
}
// cgo files are full of 'Z' symbols, which we don't handle
if len(path) > 4 && path[len(path)-4:] == ".cgo" {
continue
}
if minline, ok := found[path]; path != "" && ok {
if minline >= line {
// We've already covered this file
continue
}
}
found[path] = line
a, err := o.alineFromLine(path, line)
if err != nil {
t.Errorf("absolute line %d in object %s maps to %s:%d, but mapping that back gives error %s", i, o.Paths[0].Name, path, line, err)
} else if a != i {
t.Errorf("absolute line %d in object %s maps to %s:%d, which maps back to absolute line %d\n", i, o.Paths[0].Name, path, line, a)
}
}
}
}
func TestPCLine(t *testing.T) {
pclinetestBinary, cleanup := dotest(t)
defer cleanup()
f, tab := crack(pclinetestBinary, t)
defer f.Close()
text := f.Section(".text")
textdat, err := text.Data()
if err != nil {
t.Fatalf("reading .text: %v", err)
}
// Test PCToLine
sym := tab.LookupFunc("main.linefrompc")
wantLine := 0
for pc := sym.Entry; pc < sym.End; pc++ {
off := pc - text.Addr // TODO(rsc): should not need off; bug in 8g
if textdat[off] == 255 {
break
}
wantLine += int(textdat[off])
t.Logf("off is %d %#x (max %d)", off, textdat[off], sym.End-pc)
file, line, fn := tab.PCToLine(pc)
if fn == nil {
t.Errorf("failed to get line of PC %#x", pc)
} else if !strings.HasSuffix(file, "pclinetest.s") || line != wantLine || fn != sym {
t.Errorf("PCToLine(%#x) = %s:%d (%s), want %s:%d (%s)", pc, file, line, fn.Name, "pclinetest.s", wantLine, sym.Name)
}
}
// Test LineToPC
sym = tab.LookupFunc("main.pcfromline")
lookupline := -1
wantLine = 0
off := uint64(0) // TODO(rsc): should not need off; bug in 8g
for pc := sym.Value; pc < sym.End; pc += 2 + uint64(textdat[off]) {
file, line, fn := tab.PCToLine(pc)
off = pc - text.Addr
if textdat[off] == 255 {
break
}
wantLine += int(textdat[off])
if line != wantLine {
t.Errorf("expected line %d at PC %#x in pcfromline, got %d", wantLine, pc, line)
off = pc + 1 - text.Addr
continue
}
if lookupline == -1 {
lookupline = line
}
for ; lookupline <= line; lookupline++ {
pc2, fn2, err := tab.LineToPC(file, lookupline)
if lookupline != line {
// Should be nothing on this line
if err == nil {
t.Errorf("expected no PC at line %d, got %#x (%s)", lookupline, pc2, fn2.Name)
}
} else if err != nil {
t.Errorf("failed to get PC of line %d: %s", lookupline, err)
} else if pc != pc2 {
t.Errorf("expected PC %#x (%s) at line %d, got PC %#x (%s)", pc, fn.Name, line, pc2, fn2.Name)
}
}
off = pc + 1 - text.Addr
}
}
func TestSymVersion(t *testing.T) {
skipIfNotELF(t)
table := getTable(t)
if table.go12line == nil {
t.Skip("not relevant to Go 1.2+ symbol table")
}
for _, fn := range table.Funcs {
if fn.goVersion == verUnknown {
t.Fatalf("unexpected symbol version: %v", fn)
}
}
}
// read115Executable returns a hello world executable compiled by Go 1.15.
//
// The file was compiled in /tmp/hello.go:
//
// package main
//
// func main() {
// println("hello")
// }
func read115Executable(tb testing.TB) []byte {
zippedDat, err := os.ReadFile("testdata/pcln115.gz")
if err != nil {
tb.Fatal(err)
}
var gzReader *gzip.Reader
gzReader, err = gzip.NewReader(bytes.NewBuffer(zippedDat))
if err != nil {
tb.Fatal(err)
}
var dat []byte
dat, err = io.ReadAll(gzReader)
if err != nil {
tb.Fatal(err)
}
return dat
}
// Test that we can parse a pclntab from 1.15.
func Test115PclnParsing(t *testing.T) {
dat := read115Executable(t)
const textStart = 0x1001000
pcln := NewLineTable(dat, textStart)
tab, err := NewTable(nil, pcln)
if err != nil {
t.Fatal(err)
}
var f *Func
var pc uint64
pc, f, err = tab.LineToPC("/tmp/hello.go", 3)
if err != nil {
t.Fatal(err)
}
if pcln.version != ver12 {
t.Fatal("Expected pcln to parse as an older version")
}
if pc != 0x105c280 {
t.Fatalf("expect pc = 0x105c280, got 0x%x", pc)
}
if f.Name != "main.main" {
t.Fatalf("expected to parse name as main.main, got %v", f.Name)
}
}
var (
sinkLineTable *LineTable
sinkTable *Table
)
func Benchmark115(b *testing.B) {
dat := read115Executable(b)
const textStart = 0x1001000
b.Run("NewLineTable", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
sinkLineTable = NewLineTable(dat, textStart)
}
})
pcln := NewLineTable(dat, textStart)
b.Run("NewTable", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var err error
sinkTable, err = NewTable(nil, pcln)
if err != nil {
b.Fatal(err)
}
}
})
tab, err := NewTable(nil, pcln)
if err != nil {
b.Fatal(err)
}
b.Run("LineToPC", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
var f *Func
var pc uint64
pc, f, err = tab.LineToPC("/tmp/hello.go", 3)
if err != nil {
b.Fatal(err)
}
if pcln.version != ver12 {
b.Fatalf("want version=%d, got %d", ver12, pcln.version)
}
if pc != 0x105c280 {
b.Fatalf("want pc=0x105c280, got 0x%x", pc)
}
if f.Name != "main.main" {
b.Fatalf("want name=main.main, got %q", f.Name)
}
}
})
b.Run("PCToLine", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
file, line, fn := tab.PCToLine(0x105c280)
if file != "/tmp/hello.go" {
b.Fatalf("want name=/tmp/hello.go, got %q", file)
}
if line != 3 {
b.Fatalf("want line=3, got %d", line)
}
if fn.Name != "main.main" {
b.Fatalf("want name=main.main, got %q", fn.Name)
}
}
})
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/symtab.go
+776
View File
@@ -0,0 +1,776 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package gosym implements access to the Go symbol
// and line number tables embedded in Go binaries generated
// by the gc compilers.
package gosym
import (
"bytes"
"encoding/binary"
"fmt"
"strconv"
"strings"
)
/*
* Symbols
*/
// A Sym represents a single symbol table entry.
type Sym struct {
Value uint64
Type byte
Name string
GoType uint64
// If this symbol is a function symbol, the corresponding Func
Func *Func
goVersion version
}
// Static reports whether this symbol is static (not visible outside its file).
func (s *Sym) Static() bool { return s.Type >= 'a' }
// nameWithoutInst returns s.Name if s.Name has no brackets (does not reference an
// instantiated type, function, or method). If s.Name contains brackets, then it
// returns s.Name with all the contents between (and including) the outermost left
// and right bracket removed. This is useful to ignore any extra slashes or dots
// inside the brackets from the string searches below, where needed.
func (s *Sym) nameWithoutInst() string {
start := strings.Index(s.Name, "[")
if start < 0 {
return s.Name
}
end := strings.LastIndex(s.Name, "]")
if end < 0 {
// Malformed name, should contain closing bracket too.
return s.Name
}
return s.Name[0:start] + s.Name[end+1:]
}
// PackageName returns the package part of the symbol name,
// or the empty string if there is none.
func (s *Sym) PackageName() string {
name := s.nameWithoutInst()
// Since go1.20, a prefix of "type:" and "go:" is a compiler-generated symbol,
// they do not belong to any package.
//
// See cmd/compile/internal/base/link.go:ReservedImports variable.
if s.goVersion >= ver120 && (strings.HasPrefix(name, "go:") || strings.HasPrefix(name, "type:")) {
return ""
}
// For go1.18 and below, the prefix are "type." and "go." instead.
if s.goVersion <= ver118 && (strings.HasPrefix(name, "go.") || strings.HasPrefix(name, "type.")) {
return ""
}
pathend := strings.LastIndex(name, "/")
if pathend < 0 {
pathend = 0
}
if i := strings.Index(name[pathend:], "."); i != -1 {
return name[:pathend+i]
}
return ""
}
// ReceiverName returns the receiver type name of this symbol,
// or the empty string if there is none. A receiver name is only detected in
// the case that s.Name is fully-specified with a package name.
func (s *Sym) ReceiverName() string {
name := s.nameWithoutInst()
// If we find a slash in name, it should precede any bracketed expression
// that was removed, so pathend will apply correctly to name and s.Name.
pathend := strings.LastIndex(name, "/")
if pathend < 0 {
pathend = 0
}
// Find the first dot after pathend (or from the beginning, if there was
// no slash in name).
l := strings.Index(name[pathend:], ".")
// Find the last dot after pathend (or the beginning).
r := strings.LastIndex(name[pathend:], ".")
if l == -1 || r == -1 || l == r {
// There is no receiver if we didn't find two distinct dots after pathend.
return ""
}
// Given there is a trailing '.' that is in name, find it now in s.Name.
// pathend+l should apply to s.Name, because it should be the dot in the
// package name.
r = strings.LastIndex(s.Name[pathend:], ".")
return s.Name[pathend+l+1 : pathend+r]
}
// BaseName returns the symbol name without the package or receiver name.
func (s *Sym) BaseName() string {
name := s.nameWithoutInst()
if i := strings.LastIndex(name, "."); i != -1 {
if s.Name != name {
brack := strings.Index(s.Name, "[")
if i > brack {
// BaseName is a method name after the brackets, so
// recalculate for s.Name. Otherwise, i applies
// correctly to s.Name, since it is before the
// brackets.
i = strings.LastIndex(s.Name, ".")
}
}
return s.Name[i+1:]
}
return s.Name
}
// A Func collects information about a single function.
type Func struct {
Entry uint64
*Sym
End uint64
Params []*Sym // nil for Go 1.3 and later binaries
Locals []*Sym // nil for Go 1.3 and later binaries
FrameSize int
LineTable *LineTable
Obj *Obj
// Addition: extra data to support inlining.
inlTree
}
// An Obj represents a collection of functions in a symbol table.
//
// The exact method of division of a binary into separate Objs is an internal detail
// of the symbol table format.
//
// In early versions of Go each source file became a different Obj.
//
// In Go 1 and Go 1.1, each package produced one Obj for all Go sources
// and one Obj per C source file.
//
// In Go 1.2, there is a single Obj for the entire program.
type Obj struct {
// Funcs is a list of functions in the Obj.
Funcs []Func
// In Go 1.1 and earlier, Paths is a list of symbols corresponding
// to the source file names that produced the Obj.
// In Go 1.2, Paths is nil.
// Use the keys of Table.Files to obtain a list of source files.
Paths []Sym // meta
}
/*
* Symbol tables
*/
// Table represents a Go symbol table. It stores all of the
// symbols decoded from the program and provides methods to translate
// between symbols, names, and addresses.
type Table struct {
Syms []Sym // nil for Go 1.3 and later binaries
Funcs []Func
Files map[string]*Obj // for Go 1.2 and later all files map to one Obj
Objs []Obj // for Go 1.2 and later only one Obj in slice
go12line *LineTable // Go 1.2 line number table
}
type sym struct {
value uint64
gotype uint64
typ byte
name []byte
}
var (
littleEndianSymtab = []byte{0xFD, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00}
bigEndianSymtab = []byte{0xFF, 0xFF, 0xFF, 0xFD, 0x00, 0x00, 0x00}
oldLittleEndianSymtab = []byte{0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00}
)
func walksymtab(data []byte, fn func(sym) error) error {
if len(data) == 0 { // missing symtab is okay
return nil
}
var order binary.ByteOrder = binary.BigEndian
newTable := false
switch {
case bytes.HasPrefix(data, oldLittleEndianSymtab):
// Same as Go 1.0, but little endian.
// Format was used during interim development between Go 1.0 and Go 1.1.
// Should not be widespread, but easy to support.
data = data[6:]
order = binary.LittleEndian
case bytes.HasPrefix(data, bigEndianSymtab):
newTable = true
case bytes.HasPrefix(data, littleEndianSymtab):
newTable = true
order = binary.LittleEndian
}
var ptrsz int
if newTable {
if len(data) < 8 {
return &DecodingError{len(data), "unexpected EOF", nil}
}
ptrsz = int(data[7])
if ptrsz != 4 && ptrsz != 8 {
return &DecodingError{7, "invalid pointer size", ptrsz}
}
data = data[8:]
}
var s sym
p := data
for len(p) >= 4 {
var typ byte
if newTable {
// Symbol type, value, Go type.
typ = p[0] & 0x3F
wideValue := p[0]&0x40 != 0
goType := p[0]&0x80 != 0
if typ < 26 {
typ += 'A'
} else {
typ += 'a' - 26
}
s.typ = typ
p = p[1:]
if wideValue {
if len(p) < ptrsz {
return &DecodingError{len(data), "unexpected EOF", nil}
}
// fixed-width value
if ptrsz == 8 {
s.value = order.Uint64(p[0:8])
p = p[8:]
} else {
s.value = uint64(order.Uint32(p[0:4]))
p = p[4:]
}
} else {
// varint value
s.value = 0
shift := uint(0)
for len(p) > 0 && p[0]&0x80 != 0 {
s.value |= uint64(p[0]&0x7F) << shift
shift += 7
p = p[1:]
}
if len(p) == 0 {
return &DecodingError{len(data), "unexpected EOF", nil}
}
s.value |= uint64(p[0]) << shift
p = p[1:]
}
if goType {
if len(p) < ptrsz {
return &DecodingError{len(data), "unexpected EOF", nil}
}
// fixed-width go type
if ptrsz == 8 {
s.gotype = order.Uint64(p[0:8])
p = p[8:]
} else {
s.gotype = uint64(order.Uint32(p[0:4]))
p = p[4:]
}
}
} else {
// Value, symbol type.
s.value = uint64(order.Uint32(p[0:4]))
if len(p) < 5 {
return &DecodingError{len(data), "unexpected EOF", nil}
}
typ = p[4]
if typ&0x80 == 0 {
return &DecodingError{len(data) - len(p) + 4, "bad symbol type", typ}
}
typ &^= 0x80
s.typ = typ
p = p[5:]
}
// Name.
var i int
var nnul int
for i = 0; i < len(p); i++ {
if p[i] == 0 {
nnul = 1
break
}
}
switch typ {
case 'z', 'Z':
p = p[i+nnul:]
for i = 0; i+2 <= len(p); i += 2 {
if p[i] == 0 && p[i+1] == 0 {
nnul = 2
break
}
}
}
if len(p) < i+nnul {
return &DecodingError{len(data), "unexpected EOF", nil}
}
s.name = p[0:i]
i += nnul
p = p[i:]
if !newTable {
if len(p) < 4 {
return &DecodingError{len(data), "unexpected EOF", nil}
}
// Go type.
s.gotype = uint64(order.Uint32(p[:4]))
p = p[4:]
}
_ = fn(s)
}
return nil
}
// NewTable decodes the Go symbol table (the ".gosymtab" section in ELF),
// returning an in-memory representation.
// Starting with Go 1.3, the Go symbol table no longer includes symbol data.
func NewTable(symtab []byte, pcln *LineTable) (*Table, error) {
var n int
err := walksymtab(symtab, func(s sym) error {
n++
return nil
})
if err != nil {
return nil, err
}
var t Table
if pcln.isGo12() {
t.go12line = pcln
}
fname := make(map[uint16]string)
t.Syms = make([]Sym, 0, n)
nf := 0
nz := 0
lasttyp := uint8(0)
err = walksymtab(symtab, func(s sym) error {
n := len(t.Syms)
t.Syms = t.Syms[0 : n+1]
ts := &t.Syms[n]
ts.Type = s.typ
ts.Value = s.value
ts.GoType = s.gotype
ts.goVersion = pcln.version
switch s.typ {
default:
// rewrite name to use . instead of · (c2 b7)
w := 0
b := s.name
for i := 0; i < len(b); i++ {
if b[i] == 0xc2 && i+1 < len(b) && b[i+1] == 0xb7 {
i++
b[i] = '.'
}
b[w] = b[i]
w++
}
ts.Name = string(s.name[0:w])
case 'z', 'Z':
if lasttyp != 'z' && lasttyp != 'Z' {
nz++
}
for i := 0; i < len(s.name); i += 2 {
eltIdx := binary.BigEndian.Uint16(s.name[i : i+2])
elt, ok := fname[eltIdx]
if !ok {
return &DecodingError{-1, "bad filename code", eltIdx}
}
if n := len(ts.Name); n > 0 && ts.Name[n-1] != '/' {
ts.Name += "/"
}
ts.Name += elt
}
}
switch s.typ {
case 'T', 't', 'L', 'l':
nf++
case 'f':
fname[uint16(s.value)] = ts.Name
}
lasttyp = s.typ
return nil
})
if err != nil {
return nil, err
}
t.Funcs = make([]Func, 0, nf)
t.Files = make(map[string]*Obj)
var obj *Obj
if t.go12line != nil {
// Put all functions into one Obj.
t.Objs = make([]Obj, 1)
obj = &t.Objs[0]
t.go12line.go12MapFiles(t.Files, obj)
} else {
t.Objs = make([]Obj, 0, nz)
}
// Count text symbols and attach frame sizes, parameters, and
// locals to them. Also, find object file boundaries.
lastf := 0
for i := 0; i < len(t.Syms); i++ {
sym := &t.Syms[i]
switch sym.Type {
case 'Z', 'z': // path symbol
if t.go12line != nil {
// Go 1.2 binaries have the file information elsewhere. Ignore.
break
}
// Finish the current object
if obj != nil {
obj.Funcs = t.Funcs[lastf:]
}
lastf = len(t.Funcs)
// Start new object
n := len(t.Objs)
t.Objs = t.Objs[0 : n+1]
obj = &t.Objs[n]
// Count & copy path symbols
var end int
for end = i + 1; end < len(t.Syms); end++ {
if c := t.Syms[end].Type; c != 'Z' && c != 'z' {
break
}
}
obj.Paths = t.Syms[i:end]
i = end - 1 // loop will i++
// Record file names
depth := 0
for j := range obj.Paths {
s := &obj.Paths[j]
if s.Name == "" {
depth--
} else {
if depth == 0 {
t.Files[s.Name] = obj
}
depth++
}
}
case 'T', 't', 'L', 'l': // text symbol
if n := len(t.Funcs); n > 0 {
t.Funcs[n-1].End = sym.Value
}
if sym.Name == "runtime.etext" || sym.Name == "etext" {
continue
}
// Count parameter and local (auto) syms
var np, na int
var end int
countloop:
for end = i + 1; end < len(t.Syms); end++ {
switch t.Syms[end].Type {
case 'T', 't', 'L', 'l', 'Z', 'z':
break countloop
case 'p':
np++
case 'a':
na++
}
}
// Fill in the function symbol
n := len(t.Funcs)
t.Funcs = t.Funcs[0 : n+1]
fn := &t.Funcs[n]
sym.Func = fn
fn.Params = make([]*Sym, 0, np)
fn.Locals = make([]*Sym, 0, na)
fn.Sym = sym
fn.Entry = sym.Value
fn.Obj = obj
if t.go12line != nil {
// All functions share the same line table.
// It knows how to narrow down to a specific
// function quickly.
fn.LineTable = t.go12line
} else if pcln != nil {
fn.LineTable = pcln.slice(fn.Entry)
pcln = fn.LineTable
}
for j := i; j < end; j++ {
s := &t.Syms[j]
switch s.Type {
case 'm':
fn.FrameSize = int(s.Value)
case 'p':
n := len(fn.Params)
fn.Params = fn.Params[0 : n+1]
fn.Params[n] = s
case 'a':
n := len(fn.Locals)
fn.Locals = fn.Locals[0 : n+1]
fn.Locals[n] = s
}
}
i = end - 1 // loop will i++
}
}
if t.go12line != nil && nf == 0 {
t.Funcs = t.go12line.go12Funcs()
}
if obj != nil {
obj.Funcs = t.Funcs[lastf:]
}
return &t, nil
}
// PCToFunc returns the function containing the program counter pc,
// or nil if there is no such function.
func (t *Table) PCToFunc(pc uint64) *Func {
funcs := t.Funcs
for len(funcs) > 0 {
m := len(funcs) / 2
fn := &funcs[m]
switch {
case pc < fn.Entry:
funcs = funcs[0:m]
case fn.Entry <= pc && pc < fn.End:
return fn
default:
funcs = funcs[m+1:]
}
}
return nil
}
// PCToLine looks up line number information for a program counter.
// If there is no information, it returns fn == nil.
func (t *Table) PCToLine(pc uint64) (file string, line int, fn *Func) {
if fn = t.PCToFunc(pc); fn == nil {
return
}
if t.go12line != nil {
file = t.go12line.go12PCToFile(pc)
line = t.go12line.go12PCToLine(pc)
} else {
file, line = fn.Obj.lineFromAline(fn.LineTable.PCToLine(pc))
}
return
}
// LineToPC looks up the first program counter on the given line in
// the named file. It returns UnknownPathError or UnknownLineError if
// there is an error looking up this line.
func (t *Table) LineToPC(file string, line int) (pc uint64, fn *Func, err error) {
obj, ok := t.Files[file]
if !ok {
return 0, nil, UnknownFileError(file)
}
if t.go12line != nil {
pc := t.go12line.go12LineToPC(file, line)
if pc == 0 {
return 0, nil, &UnknownLineError{file, line}
}
return pc, t.PCToFunc(pc), nil
}
abs, err := obj.alineFromLine(file, line)
if err != nil {
return
}
for i := range obj.Funcs {
f := &obj.Funcs[i]
pc := f.LineTable.LineToPC(abs, f.End)
if pc != 0 {
return pc, f, nil
}
}
return 0, nil, &UnknownLineError{file, line}
}
// LookupSym returns the text, data, or bss symbol with the given name,
// or nil if no such symbol is found.
func (t *Table) LookupSym(name string) *Sym {
// TODO(austin) Maybe make a map
for i := range t.Syms {
s := &t.Syms[i]
switch s.Type {
case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b':
if s.Name == name {
return s
}
}
}
return nil
}
// LookupFunc returns the text, data, or bss symbol with the given name,
// or nil if no such symbol is found.
func (t *Table) LookupFunc(name string) *Func {
for i := range t.Funcs {
f := &t.Funcs[i]
if f.Sym.Name == name {
return f
}
}
return nil
}
// SymByAddr returns the text, data, or bss symbol starting at the given address.
func (t *Table) SymByAddr(addr uint64) *Sym {
for i := range t.Syms {
s := &t.Syms[i]
switch s.Type {
case 'T', 't', 'L', 'l', 'D', 'd', 'B', 'b':
if s.Value == addr {
return s
}
}
}
return nil
}
/*
* Object files
*/
// This is legacy code for Go 1.1 and earlier, which used the
// Plan 9 format for pc-line tables. This code was never quite
// correct. It's probably very close, and it's usually correct, but
// we never quite found all the corner cases.
//
// Go 1.2 and later use a simpler format, documented at golang.org/s/go12symtab.
func (o *Obj) lineFromAline(aline int) (string, int) {
type stackEnt struct {
path string
start int
offset int
prev *stackEnt
}
noPath := &stackEnt{"", 0, 0, nil}
tos := noPath
pathloop:
for _, s := range o.Paths {
val := int(s.Value)
switch {
case val > aline:
break pathloop
case val == 1:
// Start a new stack
tos = &stackEnt{s.Name, val, 0, noPath}
case s.Name == "":
// Pop
if tos == noPath {
return "<malformed symbol table>", 0
}
tos.prev.offset += val - tos.start
tos = tos.prev
default:
// Push
tos = &stackEnt{s.Name, val, 0, tos}
}
}
if tos == noPath {
return "", 0
}
return tos.path, aline - tos.start - tos.offset + 1
}
func (o *Obj) alineFromLine(path string, line int) (int, error) {
if line < 1 {
return 0, &UnknownLineError{path, line}
}
for i, s := range o.Paths {
// Find this path
if s.Name != path {
continue
}
// Find this line at this stack level
depth := 0
var incstart int
line += int(s.Value)
pathloop:
for _, s := range o.Paths[i:] {
val := int(s.Value)
switch {
case depth == 1 && val >= line:
return line - 1, nil
case s.Name == "":
depth--
if depth == 0 {
break pathloop
} else if depth == 1 {
line += val - incstart
}
default:
if depth == 1 {
incstart = val
}
depth++
}
}
return 0, &UnknownLineError{path, line}
}
return 0, UnknownFileError(path)
}
/*
* Errors
*/
// UnknownFileError represents a failure to find the specific file in
// the symbol table.
type UnknownFileError string
func (e UnknownFileError) Error() string { return "unknown file: " + string(e) }
// UnknownLineError represents a failure to map a line to a program
// counter, either because the line is beyond the bounds of the file
// or because there is no code on the given line.
type UnknownLineError struct {
File string
Line int
}
func (e *UnknownLineError) Error() string {
return "no code at " + e.File + ":" + strconv.Itoa(e.Line)
}
// DecodingError represents an error during the decoding of
// the symbol table.
type DecodingError struct {
off int
msg string
val any
}
func (e *DecodingError) Error() string {
msg := e.msg
if e.val != nil {
msg += fmt.Sprintf(" '%v'", e.val)
}
msg += fmt.Sprintf(" at byte %#x", e.off)
return msg
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/symtab_test.go
+87
View File
@@ -0,0 +1,87 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gosym
import (
"fmt"
"testing"
)
func assertString(t *testing.T, dsc, out, tgt string) {
if out != tgt {
t.Fatalf("Expected: %q Actual: %q for %s", tgt, out, dsc)
}
}
func TestStandardLibPackage(t *testing.T) {
s1 := Sym{Name: "io.(*LimitedReader).Read"}
s2 := Sym{Name: "io.NewSectionReader"}
assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "io")
assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "io")
assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LimitedReader)")
assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
}
func TestStandardLibPathPackage(t *testing.T) {
s1 := Sym{Name: "debug/gosym.(*LineTable).PCToLine"}
s2 := Sym{Name: "debug/gosym.NewTable"}
assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "debug/gosym")
assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "debug/gosym")
assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*LineTable)")
assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
}
func TestGenericNames(t *testing.T) {
s1 := Sym{Name: "main.set[int]"}
s2 := Sym{Name: "main.(*value[int]).get"}
s3 := Sym{Name: "a/b.absDifference[c/d.orderedAbs[float64]]"}
s4 := Sym{Name: "main.testfunction[.shape.int]"}
assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "main")
assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "main")
assertString(t, fmt.Sprintf("package of %q", s3.Name), s3.PackageName(), "a/b")
assertString(t, fmt.Sprintf("package of %q", s4.Name), s4.PackageName(), "main")
assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "")
assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "(*value[int])")
assertString(t, fmt.Sprintf("receiver of %q", s3.Name), s3.ReceiverName(), "")
assertString(t, fmt.Sprintf("receiver of %q", s4.Name), s4.ReceiverName(), "")
assertString(t, fmt.Sprintf("base of %q", s1.Name), s1.BaseName(), "set[int]")
assertString(t, fmt.Sprintf("base of %q", s2.Name), s2.BaseName(), "get")
assertString(t, fmt.Sprintf("base of %q", s3.Name), s3.BaseName(), "absDifference[c/d.orderedAbs[float64]]")
assertString(t, fmt.Sprintf("base of %q", s4.Name), s4.BaseName(), "testfunction[.shape.int]")
}
func TestRemotePackage(t *testing.T) {
s1 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.(*FlagSet).PrintDefaults"}
s2 := Sym{Name: "github.com/docker/doc.ker/pkg/mflag.PrintDefaults"}
assertString(t, fmt.Sprintf("package of %q", s1.Name), s1.PackageName(), "github.com/docker/doc.ker/pkg/mflag")
assertString(t, fmt.Sprintf("package of %q", s2.Name), s2.PackageName(), "github.com/docker/doc.ker/pkg/mflag")
assertString(t, fmt.Sprintf("receiver of %q", s1.Name), s1.ReceiverName(), "(*FlagSet)")
assertString(t, fmt.Sprintf("receiver of %q", s2.Name), s2.ReceiverName(), "")
}
func TestIssue29551(t *testing.T) {
tests := []struct {
sym Sym
pkgName string
}{
{Sym{goVersion: ver120, Name: "type:.eq.[9]debug/elf.intName"}, ""},
{Sym{goVersion: ver120, Name: "type:.hash.debug/elf.ProgHeader"}, ""},
{Sym{goVersion: ver120, Name: "type:.eq.runtime._panic"}, ""},
{Sym{goVersion: ver120, Name: "type:.hash.struct { runtime.gList; runtime.n int32 }"}, ""},
{Sym{goVersion: ver120, Name: "go:(*struct { sync.Mutex; math/big.table [64]math/big"}, ""},
{Sym{goVersion: ver120, Name: "go.uber.org/zap/buffer.(*Buffer).AppendString"}, "go.uber.org/zap/buffer"},
{Sym{goVersion: ver118, Name: "type..eq.[9]debug/elf.intName"}, ""},
{Sym{goVersion: ver118, Name: "type..hash.debug/elf.ProgHeader"}, ""},
{Sym{goVersion: ver118, Name: "type..eq.runtime._panic"}, ""},
{Sym{goVersion: ver118, Name: "type..hash.struct { runtime.gList; runtime.n int32 }"}, ""},
{Sym{goVersion: ver118, Name: "go.(*struct { sync.Mutex; math/big.table [64]math/big"}, ""},
// unfortunate
{Sym{goVersion: ver118, Name: "go.uber.org/zap/buffer.(*Buffer).AppendString"}, ""},
}
for _, tc := range tests {
assertString(t, fmt.Sprintf("package of %q", tc.sym.Name), tc.sym.PackageName(), tc.pkgName)
}
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/testdata/main.go
Vendored
+19
View File
@@ -0,0 +1,19 @@
package main
func linefrompc()
func pcfromline()
func main() {
// Prevent GC of our test symbols
linefrompc()
pcfromline()
inline1()
}
func inline1() {
inline2()
}
func inline2() {
println(1)
}
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/testdata/pclinetest.h
Vendored
+9
View File
@@ -0,0 +1,9 @@
// +build ignore
// Empty include file to generate z symbols
// EOF
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/testdata/pclinetest.s
Vendored
+48
View File
@@ -0,0 +1,48 @@
TEXT ·linefrompc(SB),4,$0 // Each byte stores its line delta
BYTE $2;
BYTE $1;
BYTE $1; BYTE $0;
BYTE $1; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
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BYTE $1;
BYTE $1;
BYTE $1; BYTE $0;
BYTE $1; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
BYTE $1; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
#include "pclinetest.h"
BYTE $2;
#include "pclinetest.h"
BYTE $2;
BYTE $255;
TEXT ·pcfromline(SB),4,$0 // Each record stores its line delta, then n, then n more bytes
BYTE $32; BYTE $0;
BYTE $1; BYTE $1; BYTE $0;
BYTE $1; BYTE $0;
BYTE $2; BYTE $4; BYTE $0; BYTE $0; BYTE $0; BYTE $0;
#include "pclinetest.h"
BYTE $4; BYTE $0;
BYTE $3; BYTE $3; BYTE $0; BYTE $0; BYTE $0;
#include "pclinetest.h"
BYTE $4; BYTE $3; BYTE $0; BYTE $0; BYTE $0;
BYTE $255;
go/pkg/mod/golang.org/x/vuln@v1.0.4/internal/gosym/testdata/pcln115.gz
Vendored
BIN
View File
Binary file not shown.