kcsan_check_write(9)

💅 kcsan_check_write — the Kernel API Manual, bestie edition ✨

Okay so first things first, the manual name is kcsan_check_write(9) and it lives in the Kernel API Manual — that's the family reunion this function belongs to 🫶

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🌸 NAME 🌸

kcsan_check_write — check regular write access for races

No cap, that's the whole gig: it's the vibe check for a plain old write, making sure nothing sketchy is racing up on it 🔥

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✨ SYNOPSIS ✨

kcsan_check_write (ptr , size );

Literally that's it, she's not complicated 💅

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🎀 ARGUMENTS 🎀

• ptr — address of access. That's where the thing lives that you're poking at 👀
• size — size of access. How many bytes you're claiming, bestie, don't be vague about it 💖

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🦋 SEE ALSO 🦋

Everything below is straight from the source, no paraphrasing, because these are literally the neighbors and you will be meeting them 🙈

The kernel file: ./include/linux/kcsan-checks.h

And the whole friend group:

• __kcsan_check_access(9)
• __kcsan_mb(9)
• __kcsan_wmb(9)
• __kcsan_rmb(9)
• __kcsan_release(9)
• kcsan_disable_current(9)
• kcsan_enable_current(9)
• kcsan_nestable_atomic_begin(9)
• kcsan_nestable_atomic_end(9)
• kcsan_flat_atomic_begin(9)
• kcsan_flat_atomic_end(9)
• kcsan_atomic_next(9)
• kcsan_set_access_mask(9)
• kcsan_begin_scoped_access(9)
• kcsan_end_scoped_access(9)
• __kcsan_check_read(9)
• __kcsan_check_write(9)
• __kcsan_check_read_write(9)
• kcsan_check_read(9)
• kcsan_check_read_write(9)
• ASSERT_EXCLUSIVE_WRITER(9)
• ASSERT_EXCLUSIVE_WRITER_SCOPED(9)
• ASSERT_EXCLUSIVE_ACCESS(9)
• ASSERT_EXCLUSIVE_ACCESS_SCOPED(9)
• ASSERT_EXCLUSIVE_BITS(9)

Like, that's 25 whole entries plus the header file, go read them, iykyk 💜

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And that's the page, mwah 💋 Sourced from ./include/linux, dated October 2026 — iconic, she's timeless, periodt 👑⭐