vmcoredd_up...gram_headers(9)

💖 vmcoredd_update_program_headers(9) 💖

okay so bestie, welcome to vmcoredd_update_program_headers(9) — yes that's section 9 of the Kernel API Manual, we are deep in kernel-land today and honestly? iconic. this one is a little function with a big job and you're gonna get it, i promise 🫶

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✨ NAME ✨

vmcoredd_update_program_headers — update all ELF program headers. all of them. every last one. no cap 💅

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🌸 SYNOPSIS 🌸

void vmcoredd_update_program_headers (char *elfptr , size_t elfnotesz ,
       size_t vmcoreddsz );

look at her. returns void, so no error code to stress about — she just does the thing 🎀

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🦋 ARGUMENTS 🦋

• elfptr — pointer to the elf header. like, the actual elf header, bestie, she needs the real one 🧚
• elfnotesz — size of the elf notes, aligned to page size. page-aligned, ok? that detail matters, don't forget it 🙈
• vmcoreddsz — size of the device dumps that are gonna be added to the elf note header 🍓

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💜 DESCRIPTION 💜

so what does she actually do? first up, she determines the type of ELF header — Elf64 or Elf32, vibe check — and then updates the elf note size. ✨

then, and this is the main character moment: she also updates the offsets of all the program headers that come after the elf note header. every single one. shifted. recalculated. slayed 🔥

ngl this is bookkeeping-core, but if those offsets don't get updated the whole thing falls apart, so she's kind of carrying the team here 💀

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⭐ SEE ALSO ⭐

go read these next, iykyk 👑

• Kernel file ./fs/proc/vmcore.c
• vmcore_alloc_buf(9)
• update_note_header_size_elf64(9)
• get_note_number_and_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_size(9)
• vmcore_add_device_dump(9)

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🌈 that's the whole page bestie, you ate that. this lil gem lives in ./fs/proc and comes to you courtesy of the Kernel API Manual, dated October 2026 — mwah, go forth and update those program headers 💖✨