instrument_...m_user_after(9)

💅 instrument_...m_user_after(9) 💅

Welcome to the Kernel API Manual, bestie — this page is lowkey iconic and very specific. 🫶

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✨ NAME ✨

instrument_copy_from_user_after — add instrumentation after copy_from_user, periodt. 💖

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🎀 SYNOPSIS 🎀

void instrument_copy_from_user_after (const void *to , const void __user
       *from , unsigned long n , unsigned long left );

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🦋 ARGUMENTS 🦋

• to — destination address 💌
• from — source address 🌸
• n — number of bytes to copy 🔢
• left — number of bytes not copied (as returned by copy_from_user) 😭

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🌈 DESCRIPTION 🌈

Okay so bestie, this one is here to instrument writes to kernel memory that are due to copy_from_user (and its variants). The instrumentation should be inserted after the accesses — like, after, not before, okay? 👑✨

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🔥 SEE ALSO 🔥

• Kernel file ./include/linux/instrumented.h 📁
• 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_memcpy_before(9)
• instrument_memcpy_after(9)
• instrument_get_user(9)
• instrument_put_user(9)

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Mwah 💋 this page ships from ./include/linux and is dated October 2026 — slay, no cap. 🎀💜