Lightbulb [Q] Is it possible to gain root using LG Backup?

It seems LG Backup Application simply combine files using 'tar' command with -p option and rename it to *.lbf file.
So, is it possible to gain root access by compressing superuser files(apk and binary) with proper permissions?
I can't test it since I don't have ubuntu installed on my computer :P

p.s First folder(ex /data) has 644 permission, instead 755.
p.s2 Tar format is ustar