kasan_mempoo...poison_pages(9)

💅 kasan_mempool_unpoison_pages(9) — from the Kernel API Manual, bestie ✨

okay so picture this: it's the Kernel API Manual, the function is kasan_mempool_unpoison_pages, and you're about to understand it. we're doing this together, no cap 🫶

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🌸 NAME 🌸

kasan_mempool_unpoison_pages — literally unpoisons a mempool page allocation. that's the whole vibe. 💖

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✨ SYNOPSIS ✨

void kasan_mempool_unpoison_pages (struct page *page , unsigned int
order );

yep, that's it, that's the whole signature. copy it exact, don't get creative with the semicolons, i'm begging 🙈

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🎀 ARGUMENTS 🎀

• page — a pointer to the page allocation. like, the actual pages we're talking about here. main character energy 👑
• order — the order of the allocation. it's a unsigned int and it's telling you the size/shape of what we're working with, bestie 🦋

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🧚 DESCRIPTION 🧚

so this function is intended for kernel subsystems that cache page allocations so they can reuse them instead of freeing them back to page_alloc — like, for example, mempool. it's giving "i have a stash and i'm not giving it up" 💀

what it actually does: it unpoisons a page allocation that was previously poisoned by kasan_mempool_poison_pages, and it does this without zeroing the allocation's memory. read that again. no zeroing. the memory is untouched. periodt 🔥

and for the tag-based modes, this function assigns a new tag to the allocation. fresh tag, fresh me, slay 🌈

ngl this is the kind of function that only makes sense if you already know the poisoning system, but the details are the details and i refuse to drop a single one 💅

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⭐ SEE ALSO ⭐

• Kernel file ./include/linux/kasan.h — iconic header, go read it
• kasan_unpoison_new_object(9)
• kasan_poison_new_object(9)
• kasan_slab_pre_free(9)
• kasan_slab_free(9)
• kasan_mempool_poison_pages(9) — the one that poisoned it in the first place, we love a prequel
• kasan_mempool_poison_object(9)
• kasan_mempool_unpoison_object(9)
• kasan_report(9)

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and that's the page!! 🍓 this whole thing lives in ./include/linux, it's dated October 2026, and it's filed under kasan_mempoo...poison_pages(9) (yes the truncation is real, yes it bugs me too, no i can't fix it 😭). bye bestie, go poison responsibly 💜