get_user(9)

💅 get_user(9) — Kernel API Manual 💅

okay so bestie, welcome to the get_user(9) page — it's the Kernel API Manual entry for the tiny little macro that grabs one simple variable from user space. 🧚💖

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✨ NAME ✨

get_user — get a simple variable from user space. 🫶

🌸 SYNOPSIS 🌸

get_user (x , ptr );

🎀 ARGUMENTS 🎀

• x — the variable where you store the result. 💖
• ptr — the source address, in user space. 🦋

🦋 CONTEXT 🦋

User context only. 😌 This function may sleep if pagefaults are enabled. no cap, that's the context vibe check.

💜 DESCRIPTION 💜

This macro copies a single simple variable from user space to kernel space. ✨ It supports simple types like char and int, but not larger data types like structures or arrays. 💀 So don't try to shove a whole struct through this thing, bestie — it's giving simple-variable-only energy.

ptr must have pointer-to-simple-variable type, and the result of dereferencing ptr must be assignable to x without a cast. periodt. 💅

🔥 RETURN 🔥

zero on success, or -EFAULT on error. 😭 On error, the variable x is set to zero — not me getting reset to zero energy, fr fr.

🌈 SEE ALSO 🌈

Kernel file ./arch/x86/include/asm/uaccess.h — plus __get_user(9), put_user(9), and __put_user(9). 👑 Go read those too, iykyk.

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mwah 💋 this page is from ./arch/x86/include/asm, dated October 2026, and it's literally the get_user(9) page. 🎀💖