symbol_inject: add step to codesign Mach-O binaries.

The adhoc codesign of Macho-O binaries is broken after symbol
injection. MacOS refuses to run the binaries unless we sign
them again.

Bug: 241493489
Test: build and run simpleperf_ndk64 on MacOS
Change-Id: I25ef5c6413bd97e1bfa0a4ec5d04eaefb6fea54c

symbol_inject/cmd/symbol_inject.go

@@ -94,4 +94,13 @@ func main() {
 		os.Remove(*output)
 		os.Exit(5)
 	}
+
+	if file.IsMachoFile {
+		err = symbol_inject.CodeSignMachoFile(*output)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err.Error())
+			os.Remove(*output)
+			os.Exit(6)
+		}
+	}
 }

symbol_inject/macho.go

@@ -18,6 +18,7 @@ import (
 	"debug/macho"
 	"fmt"
 	"io"
+	"os/exec"
 	"sort"
 	"strings"
 )
@@ -40,7 +41,7 @@ func extractMachoSymbols(machoFile *macho.File) (*File, error) {
 		return symbols[i].Value < symbols[j].Value
 	})
 
-	file := &File{}
+	file := &File{IsMachoFile: true}
 
 	for _, section := range machoFile.Sections {
 		file.Sections = append(file.Sections, &Section{
@@ -95,3 +96,8 @@ func dumpMachoSymbols(r io.ReaderAt) error {
 
 	return nil
 }
+
+func CodeSignMachoFile(path string) error {
+	cmd := exec.Command("/usr/bin/codesign", "--force", "-s", "-", path)
+	return cmd.Run()
+}

symbol_inject/symbol_inject.go

@@ -161,9 +161,10 @@ func findSymbol(file *File, symbolName string) (uint64, uint64, error) {
 }
 
 type File struct {
-	r        io.ReaderAt
-	Symbols  []*Symbol
-	Sections []*Section
+	r           io.ReaderAt
+	Symbols     []*Symbol
+	Sections    []*Section
+	IsMachoFile bool
 }
 
 type Symbol struct {