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support for LC_DYLD_INFO_ONLY strip

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This commit is contained in:
nganhkhoa 2023-06-02 15:24:43 +07:00
parent e3a1dcf76a
commit 3a30f12019
2 changed files with 38 additions and 17 deletions
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19
macho-go/pkg/ios/macho/dyld_info.go
View File

@ -98,19 +98,6 @@ func (mc *MachoContext) CollectBindSymbolsModern() []*ImportSymbol {
// Old convention using LC_DYLD_INFO_ONLY section and bytecode runner
func (mc *MachoContext) CollectBindSymbolsLegacy() []*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))
// mc.file.WriteAt(dummy, int64(start))
noLazy := (func() []*ImportSymbol {
start := mc.dyldinfo.bind_off
size := mc.dyldinfo.bind_size
@ -187,6 +174,7 @@ func (mc *MachoContext) readBindStream(buf *bytes.Buffer, typ string) []*ImportS
"symbol": sym.name,
}).Trace("Bind")
sym.name = ""
sym.address += 8
}
offset += 1
break
@ -241,7 +229,12 @@ func (mc *MachoContext) readBindStream(buf *bytes.Buffer, typ string) []*ImportS
offset += br
break
case BIND_OPCODE_SET_TYPE_IMM:
fmt.Println("// symbol type", imm)
break
default:
fmt.Println("BIND OPCODE NOT SUPPORTED", op, imm)
break
}
}

36
macho-go/pkg/ios/macho/edit.go
View File

@ -280,7 +280,31 @@ func (mc *MachoContext) RemoveBindSymbols() {
}
}
func (mc *MachoContext) removeBindSymbolsModern() {}
func (mc *MachoContext) removeBindSymbolsModern() {
calculateHash := func(name string) uint32 {
var h uint32 = 0x811c9dc5
for _, s := range name {
h ^= uint32(s)
h *= 0x01000193
}
return h
}
// due to some limitations when design this tool
// we write the c code to stdout lol
fmt.Println("struct imported_symbol {const char* name; const char* lib; uint32_t hash; uint64_t address;};")
fmt.Println("struct imported_symbol imported_table[] = {")
count := 0
for _, symbol := range mc.CollectBindSymbols() {
count += 1
dylib_hash := calculateHash(symbol.Dylib())
fmt.Printf("{\"%s\", \"%s\", 0x%x, 0x%x},\n",
symbol.Name(), symbol.Dylib(), dylib_hash, symbol.Address());
mc.file.WriteAt(make([]byte, 8), int64(symbol.file_address))
}
fmt.Println("};")
fmt.Printf("uint32_t nimports = %d;\n", count);
}
func (mc *MachoContext) removeBindSymbolsLegacy() {
start := mc.dyldinfo.lazy_bind_off
@ -300,7 +324,7 @@ func (mc *MachoContext) removeBindSymbolsLegacy() {
// due to some limitations when design this tool
// we write the c code to stdout lol
fmt.Println("struct imported_symbol {const char* name; const char* lib; uint32_t hash; uint64_t address;};")
fmt.Println("struct imported_symbol {const char* name; const char* lib; uint32_t hash; int segment_i; uint64_t offset;};")
fmt.Println("struct imported_symbol imported_table[] = {")
count := 0
for _, symbol := range mc.CollectBindSymbols() {
@ -309,8 +333,12 @@ func (mc *MachoContext) removeBindSymbolsLegacy() {
}
count += 1
dylib_hash := calculateHash(symbol.Dylib())
fmt.Printf("{\"%s\", \"%s\", 0x%x, 0x%x},\n",
symbol.Name(), symbol.Dylib(), dylib_hash, symbol.Address());
seg := mc.segments[symbol.segment]
offset := symbol.address - seg.Vmaddr()
fmt.Printf("{\"%s\", \"%s\", 0x%x, 0x%x, 0x%x},\n",
symbol.Name(), symbol.Dylib(), dylib_hash, symbol.segment, offset);
mc.file.WriteAt(make([]byte, 8), int64(seg.Fileoff() + offset))
}
fmt.Println("};")
fmt.Printf("uint32_t nimports = %d;\n", count);