make_kuid(9)

🎀 make_kuid(9) 🎀

okay so bestie, this is the Kernel API Manual page for make_kuid(9) — tiny function, big user-namespace energy ✨

🌸 NAME 🌸

make_kuid — map a user-namespace uid pair into a kuid. 💅

✨ SYNOPSIS ✨

kuid_t make_kuid (struct user_namespace *ns , uid_t uid );

🫶 ARGUMENTS 🫶

• ns — the user namespace that the uid is in. 🦋
• uid — the user identifier. 🎀

🔥 DESCRIPTION 🔥

This function maps a user-namespace uid pair into a kernel internal kuid, and returns that kuid. Slay. 👑

When there is no mapping defined for the user-namespace uid pair, INVALID_UID is returned. 😭 Callers are expected to test for and handle INVALID_UID being returned — like, please do the vibe check, don't just ignore it. INVALID_UID may be tested for using uid_valid. 💖

🌈 SEE ALSO 🌈

Kernel file ./kernel/user_namespace.c — plus these iconic neighbors:

• from_kuid(9)
• from_kuid_munged(9)
• make_kgid(9)
• from_kgid(9)
• from_kgid_munged(9)
• make_kprojid(9)
• from_kprojid(9)
• from_kprojid_munged(9)
• verify_root_map(9)

xoxo bestie, source/version: ./kernel — date: October 2026 — make_kuid(9) signing off 💜✨