kfence_ksize(9)

okay bestie, this is the kfence_ksize(9) page from the Kernel API Manual, and it's literally here to spill the tea on KFENCE object sizes 🫶✨

🌸 NAME 🌸

kfence_ksize — get actual amount of memory allocated for a KFENCE object 💅

✨ SYNOPSIS ✨

size_t kfence_ksize (const void *addr );

🎀 ARGUMENTS 🎀

• addr — pointer to a heap object 🧚

💖 RETURN 💖

• 0 — not a KFENCE object, must call __ksize instead,
• non-0 — this many bytes can be accessed without causing a memory error.

so if you get 0, bestie, that's your cue to go call __ksize instead 😌

🦋 DESCRIPTION 🦋

kfence_ksize returns the number of bytes requested for a KFENCE object at allocation time. This number may be less than the object size of the corresponding struct kmem_cache. That's the whole vibe — iconic, precise, no cap 💖

👑 SEE ALSO 👑

Kernel file ./include/linux/kfence.h is the home base for this whole situation, and the squad is:

• is_kfence_address(9)
• kfence_alloc_pool_and_metadata(9)
• kfence_init(9)
• kfence_shutdown_cache(9)
• kfence_alloc(9)
• kfence_object_start(9)
• __kfence_free(9)
• kfence_free(9)
• kfence_handle_page_fault(9)
• __kfence_obj_info(9)

mwah 💋 source/version: ./include/linux · date: October 2026 · page: kfence_ksize(9) — that's a wrap, bestie 🎀✨