elf_validity_cache_sechdrs(9)

💖 elf_validity_cache_sechdrs(9) 💖

okay so this is a page straight out of the Kernel API Manual bestie, and it's literally about caching section headers if they're valid. yes that's the whole vibe. let's get into it 🎀

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✨ NAME ✨

elf_validity_cache_sechdrs — cache section headers if valid, no cap 💅

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🌸 SYNOPSIS 🌸

int elf_validity_cache_sechdrs (struct load_info *info );

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🦋 ARGUMENTS 🦋

• info — the load info we're gonna compute section headers from. that's the whole input, she's the main character here 👑

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💜 DESCRIPTION 💜

so before anything gets cached, this function does a little vibe check on your ELF situation. the checks are, in order:

• the ELF header is valid (see elf_validity_ehdr — she's iconic, go read her page) ✨
• the section headers are the size we expect (like, exactly the size, no funny business) 📏
• the section array actually fits inside the user provided data 🫶
• section index 0 is NULL — yes queen, index zero stays empty, that's the rule 💀
• the section contents are inbounds, no wandering off 🚫

and then, if everything passes, she updates info with a load_info->sechdrs pointer. slay. that's the payoff 🎉

lowkey important: nothing gets cached unless every single check above passes. it's all or nothing, periodt.

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🌈 RETURN 🌈

• 0 if valid — we love a clean success 💚
• a negative error code if validation failed 😭 so like, check it, bestie

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🧚 SEE ALSO 🧚

Kernel file ./kernel/module/main.c plus this whole friend group:

• find_any_unique_sec(9)
• is_module_percpu_address(9)
• module_refcount(9)
• verify_module_namespace(9)
• elf_validity_ehdr(9)
• elf_validity_cache_secstrings(9)
• elf_validity_cache_index_info(9)
• elf_validity_cache_index_mod(9)
• elf_validity_cache_index_sym(9)
• elf_validity_cache_index_str(9)
• elf_validity_cache_index_versions(9)
• elf_validity_cache_index(9)
• elf_validity_cache_strtab(9)
• is_module_address(9)
• __module_address(9)
• is_module_text_address(9)
• __module_text_address(9)

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okay that's the page!! this one comes to you from the ./kernel/module directory, dated October 2026, and it'll forever be known as elf_validity_cache_sechdrs(9) 🫶 go validate those section headers bestie, ily, bye 💖✨🎀