ima_measure_critical_data(9)

📦 version 7.3.1, in nixpkgs unstable

💖 ima_measure_critical_data(9) 💖

okay so bestie, welcome to the Kernel API Manual ✨ — this is the page for ima_measure_critical_data, and no cap, it's kind of a big deal. Sit down, hydrate, and let's get into it 🫶

🌸 NAME 🌸

ima_measure_critical_data — measure kernel integrity critical data. that's it. that's the whole vibe check 👑

✨ SYNOPSIS ✨

int ima_measure_critical_data (const char *event_label , const char
*event_name , const void *buf , size_t buf_len , bool hash , u8 *digest
, size_t digest_len );

like, seven arguments. she's high-maintenance but she delivers 💅

🎀 ARGUMENTS 🎀

  • event_label — the unique event label, used for grouping and limiting critical data. it's literally the girl's name tag at the party 🏷️
  • event_name — the event name for the record in the IMA measurement list. this is what shows up on the receipt 🧾
  • buf — pointer to buffer data. just a lil pointer, doing pointer things 🦋
  • buf_len — length of buffer data (in bytes). yes, in bytes, we're not doing vibes-based measuring here 😭
  • hash — measure buffer data hash. a bool, so true/false energy 🔥
  • digest — buffer digest will be written to. this is where the tea gets stored 🍓
  • digest_len — buffer length. keep it, it's part of the contract 🙈

💜 DESCRIPTION 💜

So what does she do? She measures data critical to the integrity of the kernel, writes it into the IMA log, and extends the PCR. periodt 💀

Examples of critical data could be various data structures, policies, and states stored in kernel memory that can impact the integrity of the system. basically: the important stuff that lives in kernel memory and could mess with your whole system's integrity if it went sideways 😭 so we measure it. iconic behavior, honestly 👑

ngl this is the "trust but verify" function and I respect her for it 🫶

🌈 RETURN 🌈

  • 0 — the buffer has been successfully measured. slay, we ate ✅
  • 1 — the digest has been written to the passed location but not added to a measurement entry. so like, half the job done bestie 💅
  • a negative value — otherwise. it's giving "something went wrong" 😭💀

🧚 SEE ALSO 🧚

Kernel file ./security/integrity/ima/ima_main.c, plus the whole friend group:

like, the entire group chat. read them all, iykyk 💖

okay that's the page!! 🎀 this came out of ./security/integrity/ima and the date stamp on it says October 2026 — so yeah, future-coded manual page, main character energy fr fr ⭐🌸 go measure something critical bestie, and stay integrous 💜✨

📦 where this page comes from