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The second PT_LOAD segment that's the .data + .bss (assume it's the order of sections) sections "together". sizes p_filesiz and p_memsiz are requested and the kernel is up to allocate p_memsiz bytes and zero the difference between p_memsiz and p_filesiz ie., and N is the .bss memory region now filled by zeroes. How does this allocation actually works? the kernel allocate p_memsiz and put the begging of this block memory on p_vaddr so that the write/read memory region of this segment is from p_vaddr up to p_vaddr + p_memsiz ? I hope it's clear.

I figure it out. In case of someone has same doubt: it's in p_vaddr value. For dynamic object, the only change it's may be in any arbitrary address set up by the kernel/linker instead of explicitly one fixed in file itself.