binfmt_misc_get_ops(9)

✨ binfmt_misc_get_ops — Kernel API Manual ✨

okay so like, welcome to binfmt_misc_get_ops(9), the Kernel API Manual page that's literally about finding your fave bpf binary type handler by name 💅 yes bestie, we're doing kernel lore today and honestly? iconic.

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🎀 NAME 🎀

binfmt_misc_get_ops — look up a bpf binary type handler by name

🦋 SYNOPSIS 🦋

const struct binfmt_misc_ops * binfmt_misc_get_ops (struct
user_namespace *user_ns , const char *name );

like, that's the whole incantation, no cap 🔥

🌸 ARGUMENTS 🌸

• user_ns — the user namespace of the binfmt_misc instance 🫶 this is the little world we're searching inside
• name — the name the handler was registered under, iykyk ✨

💜 DESCRIPTION 💜

So what this does is: it looks for a handler named name that's registered in user_ns. Simple, right? But here's the plot twist 😭 a handler is not inherited from ancestor user namespaces. Nope, not a thing. An entry can only name a handler that was registered in the same user namespace as its instance — that's the vibe check and it's non-negotiable 💀

And the returned handler? It stays callable until binfmt_misc_put_ops — even if the backing struct_ops map gets detached or deleted in the meantime. Obsessed with the stability honestly 👑

👑 RETURN 👑

the handler on success, NULL on failure 💖 (so like, check for NULL, bestie, please 🙈)

🌈 SEE ALSO 🌈

• Kernel file ./fs/binfmt_misc_bpf.c
• bpf_binprm_set_interp(9)
• bpf_binprm_select_interp(9)
• bpf_binprm_set_interp_arg(9)
• bpf_binprm_set_flags(9)

these are the besties in the group chat, go read them too 🧚

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and that's the page!! this one came from ./fs and it's dated October 2026 🍓 so like, yes, we're reading a manpage from the future and it ate 💅 mwah, stan kernel docs, periodt ✨🎀