func haveDynTag(file *elf.File, tag elf.DynTag) bool {
if section := file.Section(".dynamic"); section != nil {
reader := io.NewSectionReader(section, 0, int64(section.Size))
switch file.Machine {
case elf.EM_X86_64:
for {
var entry elf.Dyn64
if err := binary.Read(reader, binary.LittleEndian, &entry); err != io.EOF {
if elf.DynTag(entry.Tag) == tag {
return true
}
} else {
break
}
}
case elf.EM_386:
for {
var entry elf.Dyn32
if err := binary.Read(reader, binary.LittleEndian, &entry); err != io.EOF {
if elf.DynTag(entry.Tag) == tag {
return true
}
} else {
break
}
}
}
}
return false
}
func getSectionData(f *elf.File, name string) []byte {
section := f.Section(name)
if section == nil {
log.Fatalf("failed getting section %s", name)
}
data, err := section.Data()
if err != nil {
log.Fatalf("failed getting section %s data: %s", name, err)
}
return data
}
func processGoInformation(f *elf.File) {
gosymtab := getSectionData(f, ".gosymtab")
gopclntab := getSectionData(f, ".gopclntab")
lineTable := gosym.NewLineTable(gopclntab, f.Section(".text").Addr)
table, err := gosym.NewTable(gosymtab, lineTable)
if err != nil {
log.Fatalf("failed making table: %s", err)
}
printSyms(table.Syms)
printFuncs(table.Funcs)
printFiles(table.Files)
}
func (dbp *Process) parseDebugLineInfo(exe *elf.File, wg *sync.WaitGroup) {
defer wg.Done()
if sec := exe.Section(".debug_line"); sec != nil {
debugLine, err := exe.Section(".debug_line").Data()
if err != nil {
fmt.Println("could not get .debug_line section", err)
os.Exit(1)
}
dbp.lineInfo = line.Parse(debugLine)
} else {
fmt.Println("could not find .debug_line section in binary")
os.Exit(1)
}
}
func (dbp *Process) parseDebugFrame(exe *elf.File, wg *sync.WaitGroup) {
defer wg.Done()
if sec := exe.Section(".debug_frame"); sec != nil {
debugFrame, err := exe.Section(".debug_frame").Data()
if err != nil {
fmt.Println("could not get .debug_frame section", err)
os.Exit(1)
}
dbp.frameEntries = frame.Parse(debugFrame)
} else {
fmt.Println("could not find .debug_frame section in binary")
os.Exit(1)
}
}
func dwzparser(dwzfile *elf.File, offset int64, debug_package string, debug_file string) string {
if section := dwzfile.Section(".debug_str"); section != nil {
reader := io.NewSectionReader(section, 0, int64(section.Size))
reader.Seek(offset, 1)
bufreader := bufio.NewReader(reader)
// http://golang.org/pkg/bufio/#Reader.ReadString
str, err := bufreader.ReadString('\x00')
if err != nil {
log.Println(err, debug_package, debug_file)
}
return strings.TrimSuffix(str, "\x00")
}
panic("dwzparser ran into problems ;(")
}
func (dbp *Process) obtainGoSymbols(exe *elf.File, wg *sync.WaitGroup) {
defer wg.Done()
var (
symdat []byte
pclndat []byte
err error
)
if sec := exe.Section(".gosymtab"); sec != nil {
symdat, err = sec.Data()
if err != nil {
fmt.Println("could not get .gosymtab section", err)
os.Exit(1)
}
}
if sec := exe.Section(".gopclntab"); sec != nil {
pclndat, err = sec.Data()
if err != nil {
fmt.Println("could not get .gopclntab section", err)
os.Exit(1)
}
}
pcln := gosym.NewLineTable(pclndat, exe.Section(".text").Addr)
tab, err := gosym.NewTable(symdat, pcln)
if err != nil {
fmt.Println("could not get initialize line table", err)
os.Exit(1)
}
dbp.goSymTable = tab
}
func elfGoSyms(f *elf.File) (*gosym.Table, os.Error) {
text := f.Section(".text")
symtab := f.Section(".gosymtab")
pclntab := f.Section(".gopclntab")
if text == nil || symtab == nil || pclntab == nil {
return nil, nil
}
symdat, err := symtab.Data()
if err != nil {
return nil, err
}
pclndat, err := pclntab.Data()
if err != nil {
return nil, err
}
pcln := gosym.NewLineTable(pclndat, text.Addr)
tab, err := gosym.NewTable(symdat, pcln)
if err != nil {
return nil, err
}
return tab, nil
}
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 blacklisted(file string, obj *elf.File) (bool, error) {
lib := regexp.MustCompile(`^.*/lib([\w-]+)\.so[\d.]*$`)
glcore := regexp.MustCompile(`libnvidia-e?glcore\.so`)
gldispatch := regexp.MustCompile(`libGLdispatch\.so`)
if m := lib.FindStringSubmatch(file); m != nil {
switch m[1] {
// Blacklist EGL/OpenGL libraries issued by other vendors
case "EGL":
fallthrough
case "GLESv1_CM":
fallthrough
case "GLESv2":
fallthrough
case "GL":
deps, err := obj.DynString(elf.DT_NEEDED)
if err != nil {
return false, err
}
for _, d := range deps {
if glcore.MatchString(d) || gldispatch.MatchString(d) {
return false, nil
}
}
return true, nil
// Blacklist TLS libraries using the old ABI (!= 2.3.99)
case "nvidia-tls":
const abi = 0x6300000003
s, err := obj.Section(".note.ABI-tag").Data()
if err != nil {
return false, err
}
return binary.LittleEndian.Uint64(s[24:]) != abi, nil
}
}
return false, nil
}