Answer by tim for /proc/self/maps - 3rd mapped piece of file?

hi i had the same confuse as you, i had dig the internet and find this, i think this is the answer to your confuse too. link: https://stackoverflow.com/questions/33756119/relationship-between-vma-and-elf-segments

for shrot:

00400000-0040b000 r-xp 00000000 08:02 1186756             /usr/bin/cat**use for store text code and const varibles**0060a000-0060b000 r--p 0000a000 08:02 1186756             /usr/bin/cat**use for GNU_RELRO relocated info**0060b000-0060c000 rw-p 0000b000 08:02 1186756             /usr/bin/catuse for bss data segment

hope this useful