aa_get_label_rcu(9)

💅 aa_get_label_rcu — Kernel API Manual, bestie edition 🎀

okay so we're in the kernel API manual rn and this page is literally called aa_get_label_rcu(9), iykyk ✨ it's living in the AppArmor security corner of the kernel and honestly? she's a tiny little function with one very specific job and she does it 💖

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🌸 NAME 🌸

aa_get_label_rcu — increment refcount on a label that can be replaced 🦋

like yes that's the whole thing. it bumps the refcount. on a label. that can be replaced. main character energy fr fr 💅

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✨ SYNOPSIS ✨

struct aa_label * aa_get_label_rcu (struct aa_label __rcu **l );

ngl, look at that signature. she's giving pointer-to-pointer-to-a-label-that's-__rcu 🔥 copy it exactly bestie, don't be creative with it 😭

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🎀 ARGUMENTS 🎀

• l — pointer to the label that can be replaced, and it is NOT NULL 🚨 like genuinely do not pass NULL here, that's not the vibe. also note it's a struct aa_label __rcu ** — double pointer, RCU flavoured, iconic 👑

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⭐ RETURN ⭐

• you get back a pointer to a refcounted label 🫶 slay, that's the good outcome
• else NULL if there's no label 😭 (basically the "nobody's home" outcome)

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🌈 SEE ALSO 🌈

okay so go read these too, they're all hanging out together 👯‍♀️

• Kernel file ./security/apparmor/include/label.h — where __aa_get_label(9) lives 👀
• aa_get_newest_label(9)
• aa_get_newest_label_condref(9)

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💀 reminder: l is NOT NULL. that's not a suggestion, that's the contract, bestie 🫶

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and that's the page 🧚 source lives at ./security/apparmor/include and it's dated October 2026 — mwah, go forth and refcount responsibly 💜🍓