copy_min_struct_from_user(9)

💖 copy_min_struct_from_user(9) 💖

okay so bestie, welcome to the Kernel API Manual page for copy_min_struct_from_user(9) — it’s giving safe future-proof argument copying, no cap. This is the whole rundown, and every lil detail stays exactly where it belongs. 🫶

🌸 NAME 🌸

copy_min_struct_from_user — Safe future-proof argument copying. periodt. ✨

🦋 SYNOPSIS 🦋

int copy_min_struct_from_user (void *const dst , const size_t ksize ,
const size_t ksize_min , const void __user *const src , const size_t
usize );

🎀 ARGUMENTS 🎀

• dst — Kernel space pointer or NULL. iconic, honestly.
• ksize — actual size of the data pointed to by dst.
• ksize_min — minimal required size to be copied. the way this one is literally the minimum? obsessed.
• src — User space pointer or NULL.
• usize — (Alleged) size of the data pointed to by src. “alleged” is doing so much work here 😭

⭐ DESCRIPTION ⭐

Extend copy_struct_from_user to check for consistent user buffer. That’s the whole mission, bestie — future-proof argument copying, exactly as advertised. 💅

🔥 RETURN 🔥

• 0 on success
• -errno on failure

🌈 SEE ALSO 🌈

• Kernel file ./security/landlock/syscalls.c
• sys_landlock_create_ruleset(9)
• sys_landlock_add_rule(9)
• sys_landlock_restrict_self(9)

and that’s the tea for copy_min_struct_from_user(9) 🍓 — source/version is ./security/landlock, dated October 2026. mwah 💋✨