instrument_put_user(9)

💅 NAME 💅

okay so bestie, this is instrument_put_user(9) from the Kernel API Manual — it’s the one that adds instrumentation to put_user()-like macros ✨

🎀 SYNOPSIS 🎀

instrument_put_user (from , ptr , size );

🌸 ARGUMENTS 🌸

• from — source address 👀
• ptr — userspace pointer to copy to 🫶
• size — number of bytes to copy, literally the byte count 💖

🦋 DESCRIPTION 🦋

put_user and friends are fragile, fr fr 😭 so it may depend on the implementation whether the instrumentation happens before or after the data is copied from the userspace. no cap, that’s the whole vibe check here 💅

✨ SEE ALSO ✨

the kernel file is ./include/linux/instrumented.h 🧚 and the whole related-function squad is:

• instrument_read(9)
• instrument_write(9)
• instrument_read_write(9)
• instrument_atomic_read(9)
• instrument_atomic_write(9)
• instrument_atomic_read_write(9)
• instrument_copy_to_user(9)
• instrument_copy_from_user_before(9)
• instrument_copy_from_user_after(9)
• instrument_memcpy_before(9)
• instrument_memcpy_after(9)
• instrument_get_user(9)

sending u off with the source ./include/linux, the October 2026 date energy, and all the instrument_put_user(9) love 🫶💖🎀