setattr_should_drop_suidgid(9)

💅 setattr_should_drop_suidgid ✨

okay bestie, so this one is from the Kernel API Manual — section 9, kernel API, we love that for us 🎀

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✨ NAME ✨

setattr_should_drop_suidgid — the vibe check that decides whether the set{g,u}id bit needs to be dropped 👑

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🦋 SYNOPSIS 🦋

int setattr_should_drop_suidgid (struct mnt_idmap *idmap , struct inode
*inode );

literally the whole signature, no cap, copy it exactly 💖

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🌸 ARGUMENTS 🌸

• idmap — the idmap of the mount that the inode was found from. yeah, that's the one 🫶
• inode — the inode we're checking. main character energy, honestly ⭐

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💜 DESCRIPTION 💜

so this function is the one that determines whether the set{g,u}id bits need to be removed. like, that's the whole job 🧚

• if the setuid bit needs to be removed, ATTR_KILL_SUID gets returned 🔥
• if the setgid bit needs to be removed, ATTR_KILL_SGID gets returned 🌈
• if both set{g,u}id bits need to be removed, you get the corresponding mask of both flags back 😭

it's giving "which flags do i need to kill" and honestly? iconic 💅

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⭐ RETURN ⭐

a mask of ATTR_KILL_S{G,U}ID indicating which — if any — setid bits to remove, and 0 otherwise 🎀

lowkey important: the "if any" is doing real work there. sometimes the answer is just 0 and that's valid 💀

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🍓 SEE ALSO 🍓

• Kernel file ./fs/attr.c
• setattr_should_drop_sgid(9)
• chown_ok(9)
• chgrp_ok(9)
• setattr_prepare(9)
• inode_newsize_ok(9)
• setattr_copy_mgtime(9)
• setattr_copy(9)
• notify_change(9)

go read the whole friend group, fr fr 🫶

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and that's the page, bestie ✨ this cutie lives in ./fs, and the version/date situation is October 2026 — so yeah, technically from the future 👑 see you in the next one, mwah 🎀💖