process-keyring(7)

💖 process-keyring — the per-process shared keyring 💖

okay bestie, so this is process-keyring(7) from the Linux man-pages, and it's literally about the per-process shared keyring. let's get into it 🫶

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✨ NAME ✨

process-keyring — the per-process shared keyring, aka the little keyring your process calls its own 💅

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🌸 DESCRIPTION 🌸

so the process keyring is a keyring that exists to anchor keys on behalf of a process. it's not like, always there waiting for you — it is created only when a process requests it. main character energy: it shows up when summoned. ✨

and its name (the description, that is) is:

_pid

periodt, that's the whole vibe.

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there's also a special serial number value, KEY_SPEC_PROCESS_KEYRING, which you can drop in in lieu of the actual serial number of the calling process's process keyring. so instead of hunting down the real number, you just use that constant. iconic behavior, honestly 👑

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over in the keyctl(1) utility, you can use @p instead of a numeric key ID — basically the same kinda deal. but… plot twist 😭 since keyctl(1) is a program that's run after forking, this is of no utility. so like, cute in theory, useless in practice. we love a decorative feature. 💀

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now here's the lore you actually need to know about how it gets shared around 🧚

• A thread created using the clone(2) CLONE_THREAD flag has the same process keyring as the caller of clone(2). shared vibes only.
• When a new process is created using fork() it initially has no process keyring. brand new, empty-handed, starting from scratch fr fr.
• A process's process keyring is cleared on execve(2). wiped. reset. new era.
• The process keyring is destroyed when the last thread that refers to it terminates. last one out turns off the lights 🕯️

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and the final boss rule, pay attention bestie:

If a process doesn't have a process keyring at the moment it gets accessed, then the process keyring will be created if the keyring is to be modified — otherwise, you get the error ENOKEY.

so: modifying something = it spawns into existence for you ✨ reading something = nope, ENOKEY, sorry babe. that's the rule and it's not up for debate.

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🌈 SEE ALSO 🌈

go read these next, they're all connected, iykyk:

• keyctl(1)
• keyctl(3)
• keyrings(7)
• persistent-keyring(7)
• session-keyring(7)
• thread-keyring(7)
• user-keyring(7)
• user-session-keyring(7)

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and that's the whole page!! this came from the Linux man-pages, version 6.20, dated 2026-02-08. mwah, go slay your keyrings bestie 💖🎀🦋🌸💅