copy_notes_elf64(9)

💖 copy_notes_elf64(9) — a Kernel API Manual moment 💖

okay so bestie, we're in the Kernel API Manual today and this one is lowkey a little legend. say hi to copy_notes_elf64 👋✨

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✨ NAME ✨

copy_notes_elf64 — copy ELF note segments in a given buffer 🎀

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🌸 SYNOPSIS 🌸

int copy_notes_elf64 (const Elf64_Ehdr *ehdr_ptr , char *notes_buf );

that's the whole vibe check right there. a classic. no cap. 💅

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🦋 ARGUMENTS 🦋

• ehdr_ptr — the ELF header, bestie. that's it, that's the whole thing. 👑
• notes_buf — the buffer where the ELF note segments get copied into 🫶

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🌈 DESCRIPTION 🌈

So here's what she does: this function copies the ELF note segment from the 1st kernel into the buffer notes_buf in the 2nd kernel. two kernels, one buffer, iconic behaviour honestly. 🧚✨

and it's assumed — like, taken as a given, don't come for her — that the size of the buffer notes_buf is equal to or larger than the sum of the real ELF note segment headers and data. so size it right or it's giving chaos. 💀

also assumed: the program headers with PT_NOTE type that ehdr_ptr points to have already been updated by update_note_header_size_elf64, and each of those PT_NOTE program headers has the actual ELF note segment size sitting in its p_memsz member. so do that first, okay? order matters, iykyk. 🎯

fr fr, both of those assumptions are load-bearing — this function trusts you completely and does not double-check your homework. 🙈

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💜 SEE ALSO 💜

Kernel file ./fs/proc/vmcore.c plus the whole friend group:

• vmcore_alloc_buf(9)
• update_note_header_size_elf64(9)
• get_note_number_and_size_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)

go read them all, they're literally all slaying in their own lanes 🔥⭐

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and that's the page!! shoutout to ./fs/proc for being the source, and this was served fresh in October 2026 📅💖 bye bestie, go copy some note segments responsibly 🎀🌸