get_note_num...d_size_elf64(9)

okay so bestie, welcome to the get_note_num...d_size_elf64(9) page in the Kernel API Manual ✨ this one is lowkey the note-header accountant of the ELF world, and we are gonna read it together, no cap.

🌸 NAME 🌸

get_note_number_and_size_elf64 — get the number of PT_NOTE program headers and sum of real size of their ELF note segment headers and data. that's the whole assignment, fr fr. 💖

✨ SYNOPSIS ✨

the signature is literally:

int get_note_number_and_size_elf64 (const Elf64_Ehdr *ehdr_ptr , int
       *nr_ptnote , u64 *sz_ptnote );

yes bestie, it returns int, and those pointers are exactly as written. no edits, no vibes-based renaming. 💅

🎀 ARGUMENTS 🎀

• ehdr_ptr — ELF header. that's it, that's the arg. 👑
• nr_ptnote — buffer for the number of PT_NOTE program headers. it's where the count goes, bestie. ✨
• sz_ptnote — buffer for size of unique PT_NOTE program header. literally a buffer for that size. 🎀

💅 DESCRIPTION 💅

okay so the plot: this function is used to merge multiple PT_NOTE program headers into a unique single one. the way that this function just merges multiple PT_NOTE program headers into a unique single one is iconic, honestly. the resulting unique entry will have sz_ptnote in its phdr->p_mem. that's the field, periodt. 💀

and there's an assumption, so listen up: it is assumed that program headers with PT_NOTE type pointed to by ehdr_ptr has already been updated by update_note_header_size_elf64, and each of PT_NOTE program headers has actual ELF note segment size in its p_memsz member. that's the prerequisite vibe check, bestie. 🫶

🦋 SEE ALSO 🦋

the kernel file is ./fs/proc/vmcore.c, and these linked besties are all invited to the group chat:

• Kernel file ./fs/proc/vmcore.c
• vmcore_alloc_buf(9)
• update_note_header_size_elf64(9)
• copy_notes_elf64(9)
• update_note_header_size_elf32(9)
• get_note_number_and_size_elf32(9)
• copy_notes_elf32(9)
• vmcoredd_write_header(9)
• vmcoredd_update_program_headers(9)
• vmcoredd_update_size(9)
• vmcore_add_device_dump(9)

kisses from the ./fs/proc girlies 🧚💜 — October 2026, the get_note_num...d_size_elf64(9) manual edition. that's the source/version and date, right there. periodt. 💅