__begin_curr...crit_section(9)

💅 __begin_curr...crit_section(9) — from the Kernel API Manual, bestie

okay so real talk, the page title up top is __begin_curr...crit_section(9) and this whole thing lives in the Kernel API Manual, section 9. Buckle up, it's AppArmor o'clock 🎀

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✨ NAME ✨

__begin_current_label_crit_section — literally just current's confining label, that's the whole gig 🫶

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🌸 SYNOPSIS 🌸

struct aa_label * __begin_current_label_crit_section (bool *needput );

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🦋 ARGUMENTS 🦋

• needput — you pass in a pointer to a bool and it gets stuffed with whether the label needs to be put once you're done with the crit section. it's giving "receipt for later" energy 🧾✨

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👑 RETURN 👑

you get back the up-to-date confining label, or the ns unconfined label. and it's NOT NULL — never null, not once, so no you don't need a if (!label) check, bestie, it's fr fr guaranteed 💅

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🔥 DESCRIPTION 🔥

it is safe to call inside locks. iconic behavior honestly, no cap 🙈

the reference you get handed back must be put with __end_current_label_crit_section. like, that's not a suggestion, that's the contract. you take the label, you give the label back. balance. 🌈

ok so this is the part where i need you to pay attention: this must NOT be used if the task cred could be updated within the critical section — you know, in that window between __begin_current_label_crit_section .. __end_current_label_crit_section. don't do it. i'm serious. 💀

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⭐ SEE ALSO ⭐

• the kernel file ./security/apparmor/include/cred.h — go read it, iykyk 📖
• aa_get_newest_cred_label(9)
• aa_current_raw_label(9)
• aa_get_current_label(9)
• __end_cred_crit_section(9)
• __begin_cred_crit_section(9)
• __end_current_label_crit_section(9)
• end_current_label_crit_section(9)
• begin_current_label_crit_section(9)

a whole little friend group of crit-section functions, obsessed 🫶🌸

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and that's the page!! it lives over in ./security/apparmor/include, dated October 2026, and the footer names it __begin_curr...crit_section(9) — yes the footer abbreviates it with a ..., no i don't know why either, slay 💅✨ 🎀