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This commit is contained in:
nganhkhoa
2023-05-31 16:31:52 +07:00
parent e3453ae127
commit 841a50f8e1
12 changed files with 201 additions and 196 deletions
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84
macho-go/pkg/ios/macho/dyld_info.go
View File

@ -46,41 +46,41 @@ func (sym *ImportSymbol) Stub() uint64 {
}
func (mc *MachoContext) CollectLazyBindSymbols() []*ImportSymbol {
if mc.dyldinfo == nil {
return mc.CollectLazyBindSymbolsModern()
} else {
return mc.CollectLazyBindSymbolsLegacy()
}
if mc.dyldinfo == nil {
return mc.CollectLazyBindSymbolsModern()
} else {
return mc.CollectLazyBindSymbolsLegacy()
}
}
// New convention using LC_DYLD_CHAINED_FIXUPS
func (mc *MachoContext) CollectLazyBindSymbolsModern() []*ImportSymbol {
var buf []byte
for _, cmd := range mc.Linkedits() {
if (cmd.Cmd() != LC_DYLD_CHAINED_FIXUPS) {
continue
}
var buf []byte
for _, cmd := range mc.Linkedits() {
if cmd.Cmd() != LC_DYLD_CHAINED_FIXUPS {
continue
}
count_offset := int64(cmd.Dataoff()) + 16
mc.file.WriteAt([]byte{0, 0, 0, 0}, count_offset)
count_offset := int64(cmd.Dataoff()) + 16
mc.file.WriteAt([]byte{0, 0, 0, 0}, count_offset)
symbol_offset := int64(0x4000)
mc.file.WriteAt([]byte{0, 0, 0, 0, 0, 0, 0, 0}, symbol_offset)
symbol_offset := int64(0x4000)
mc.file.WriteAt([]byte{0, 0, 0, 0, 0, 0, 0, 0}, symbol_offset)
buf = mc.buf[cmd.Dataoff():cmd.Dataoff() + cmd.Datasize()]
break
}
buf = mc.buf[cmd.Dataoff() : cmd.Dataoff()+cmd.Datasize()]
break
}
r := bytes.NewReader(buf)
rr := bufio.NewReader(r)
var fixups_version int32
var starts_offset int32
var imports_offset int32
var symbols_offset int32
var imports_count int32
var imports_format int32
var symbols_format int32
var fixups_version int32
var starts_offset int32
var imports_offset int32
var symbols_offset int32
var imports_count int32
var imports_format int32
var symbols_format int32
binary.Read(rr, mc.byteorder, &fixups_version)
binary.Read(rr, mc.byteorder, &starts_offset)
binary.Read(rr, mc.byteorder, &imports_offset)
@ -88,36 +88,36 @@ func (mc *MachoContext) CollectLazyBindSymbolsModern() []*ImportSymbol {
binary.Read(rr, mc.byteorder, &imports_count)
binary.Read(rr, mc.byteorder, &imports_format)
binary.Read(rr, mc.byteorder, &symbols_format)
fmt.Printf(
"HMMGE %x %x\n",
imports_offset,
imports_count,
)
fmt.Printf(
"HMMGE %x %x\n",
imports_offset,
imports_count,
)
return []*ImportSymbol{}
return []*ImportSymbol{}
}
// Old convention using LC_DYLD_INFO_ONLY section and bytecode runner
func (mc *MachoContext) CollectLazyBindSymbolsLegacy() []*ImportSymbol {
start := mc.dyldinfo.lazy_bind_off
size := mc.dyldinfo.lazy_bind_size
size := mc.dyldinfo.lazy_bind_size
end := start + size
if size == 0 {
return []*ImportSymbol{}
}
// clear this whole section to 0x00 BIND_OPCODE_DONE
dummy := []byte{
0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
}
// make LINK EDIT section writable
// mc.file.WriteAt([]byte{0x03}, int64(0x3f8))
// set number of symbols to 0
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x444))
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x44c))
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x48c))
// clear this whole section to 0x00 BIND_OPCODE_DONE
dummy := []byte{
0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69, 0x69,
}
// make LINK EDIT section writable
// mc.file.WriteAt([]byte{0x03}, int64(0x3f8))
// set number of symbols to 0
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x444))
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x44c))
mc.file.WriteAt([]byte{0, 0, 0, 0}, int64(0x48c))
mc.file.WriteAt(dummy, int64(start))
buf := bytes.NewBuffer(mc.buf[start:end])

11
macho-go/pkg/ios/macho/edit.go
View File

@ -40,12 +40,13 @@ func rewriteLoadcommandsWithoutCodesignature(mc *MachoContext) {
// CODE_SIGNATURE load commands points to the codesign data offset and size.
// __LINKEDIT section points to data offset and size.
// We have:
// linkedit = (section*) LC_SEGMENT.section[0] // name="__LINKEDIT"
// codesign = (linkedit_data_command*) LC_CODE_SIGNATURE
// BinarySize = { f.seek(0, SEEKEND); return f.tell() }
//
// linkedit->fileoff + linkedit->filesize == codesign->dataOff + codesign->dataSize
// linkedit->fileoff + linkedit->filesize == BinarySize
// linkedit = (section*) LC_SEGMENT.section[0] // name="__LINKEDIT"
// codesign = (linkedit_data_command*) LC_CODE_SIGNATURE
// BinarySize = { f.seek(0, SEEKEND); return f.tell() }
//
// linkedit->fileoff + linkedit->filesize == codesign->dataOff + codesign->dataSize
// linkedit->fileoff + linkedit->filesize == BinarySize
//
// To remove the codesign data, we truncate the file to remove the codesign data.
// Then we update the linkedit->filesize to linkedit->filesize - codesign->dataSize

2
macho-go/pkg/ios/macho/load_commands.go
View File

@ -456,7 +456,7 @@ func (lcmd *Symtab) Cmdsize() uint32 {
}
func (lcmd *Symtab) Cmdname() string {
return fmt.Sprintf("%s symoff:0x%x nsyms:%d stroff:0x%x strsize:0x%x",
return fmt.Sprintf("%s symoff:0x%x nsyms:%d stroff:0x%x strsize:0x%x",
lcmd.c.Cmdname(), lcmd.symoff, lcmd.nsyms, lcmd.stroff, lcmd.strsize)
}

10
macho-go/pkg/ios/macho/macho.go
View File

@ -71,10 +71,12 @@ func (mc *MachoContext) WriteBufferTo(w io.Writer) (int, error) {
// Parse the provided Mach-O binary from a file
// The first 4 bytes of the file must be the MachO magic
// That is:
// file.Seek(0, io.SeekStart)
// magic := make([]byte, 4)
// file.Read(magic)
// assert magic == []byte{macho magic bytes}
//
// file.Seek(0, io.SeekStart)
// magic := make([]byte, 4)
// file.Read(magic)
// assert magic == []byte{macho magic bytes}
//
// or else, parsing error is panic
func (mc *MachoContext) ParseFile(file *os.File, length int) error {
file.Seek(0, io.SeekStart)

10
macho-go/pkg/ios/macho/util.go
View File

@ -83,8 +83,8 @@ func (mc *MachoContext) DylibExisted(name string) bool {
// simple check
// Advanced check requires expansion of @rpath
for _, dylib := range mc.dylibs {
dylib_ := bytes.Trim(dylib.name, "\x00")
match := bytes.Compare(dylib_, []byte(name)) == 0
dylib_ := bytes.Trim(dylib.name, "\x00")
match := bytes.Compare(dylib_, []byte(name)) == 0
log.WithFields(log.Fields{
"left": dylib_,
"right": []byte(name),
@ -101,8 +101,8 @@ func (mc *MachoContext) RPathExisted(path string) bool {
// simple check
// Advanced check requires expansion of @rpath
for _, rpath := range mc.rpaths {
rpath_ := bytes.Trim(rpath.path, "\x00")
match := bytes.Compare(rpath_, []byte(path)) == 0
rpath_ := bytes.Trim(rpath.path, "\x00")
match := bytes.Compare(rpath_, []byte(path)) == 0
log.WithFields(log.Fields{
"left": rpath_,
"right": []byte(path),
@ -138,7 +138,7 @@ func (mc *MachoContext) FindSegment(name string) Segment {
}
func (mc *MachoContext) Cut(offset uint64, size uint64) []byte {
return mc.buf[offset : offset + size];
return mc.buf[offset : offset+size]
}
// INIT POINTER