kcsan_set_access_mask(9)

📦 version 7.3.1, in nixpkgs unstable

👑 kcsan_set_access_mask — the kcsan(9) girlies are gonna eat this up

okay so bestie, welcome to the kcsan_set_access_mask page of the Kernel API Manual ✨ it's short, it's sweet, it's literally one function, and yes we're gonna make it iconic anyway 💅

🌸 NAME 🌸

kcsan_set_access_mask — set access mask. that's it. that's the whole name. short king behavior fr fr 🫶

✨ SYNOPSIS ✨

void kcsan_set_access_mask (unsigned long mask );

like, look at her. void return, takes one unsigned long, no notes. main character energy honestly 🎀

🦋 ARGUMENTS 🦋

  • mask — a bitmask. yes bestie, that's the entire description, the manpage is not gonna elaborate, so neither am I 🙈 it's a bitmask. bits. masked. slay.

💖 DESCRIPTION 💖

okay so here's the tea ☕ — kcsan_set_access_mask sets the access mask for all accesses in the current context, but only if the mask is non-zero. zero? nothing happens. we love a conditional 💀

and then the actual reporting rule, which is the important part so pay attention bestie 👀: only value changes to bits set in the mask will be reported.

read that again. bits set in the mask. that's the whole vibe check. if a bit isn't in your mask, its changes are simply not the moment 💅

ngl this is the kind of thing where getting the mask wrong means you're silently not seeing reports, so like... double check your bits, bestie 😭

🔥 SEE ALSO 🔥

the whole kcsan friend group showed up, no cap 👑

and that's the page!! 🌈 this lil beauty lives in ./include/linux, and it's dated October 2026 — so like, future icon behavior honestly ⭐ go read the rest of the kcsan girls, they're all linked above, ily, bye 💜🧚🍓

📦 where this page comes from