PR_SET_MM_MAP(2const)

✨ PR_SET_MM_MAP(2const) ✨

okay bestie, gather round 💖 this one lives in the 2const manual and it's all about poking at the kernel's memory map descriptor fields. yes, that kind of memory map. no cap, it's giving "checkpoint/restore gremlin" energy and we're obsessed.

🌸 NAME 🌸

PR_SET_MM_MAP, PR_SET_MM_MAP_SIZE — modify kernel memory map descriptor fields 🧚

📚 LIBRARY 📚

Standard C library (libc, -lc) — the usual queen 💅

✨ SYNOPSIS ✨

#include <linux/prctl.h>  /* Definition of PR_* constants */
#include <sys/prctl.h>

int prctl(PR_SET_MM, PR_SET_MM_MAP,
          struct prctl_mm_map *map, unsigned long size, 0L);
int prctl(PR_SET_MM, PR_SET_MM_MAP_SIZE, unsigned int *size, 0L, 0L);

💖 DESCRIPTION 💖

🌈 PR_SET_MM_MAP

This is the one-shot girlie 🫶 — it gives you access to all the addresses that are modifyable with PR_SET_MM(2const), all at once, by handing over a struct prctl_mm_map (which is defined in <linux/prctl.h>, as always). The size argument should provide the size of the struct. literally just tell it how big your struct is and slide it over 😌

🦋 PR_SET_MM_MAP_SIZE

Returns — via the size argument — the size of the struct prctl_mm_map that the kernel actually expects. So if you're sitting there like "bestie what struct even is this", this is your vibe check ✅ It lets user space find a compatible struct. teamwork fr fr 💜

⚠️ okay so important: these features are available only if the kernel is built with the CONFIG_CHECKPOINT_RESTORE option enabled. no config option, no party. 💀

🎀 RETURN VALUE 🎀

On success, 0 is returned. 🥳 On error, -1 is returned, and errno is set to indicate the error. classic.

👑 ERRORS 👑

• EINVAL — the third argument is an invalid address. 🙈 (yes, that third argument. look at the synopsis. it's the map / size slot depending on which call you're doing.)

⭐ STANDARDS ⭐

Linux. 🐧 icon behavior only.

🌸 HISTORY 🌸

Linux 3.18. an elder, but a cute one. 💅

🔥 SEE ALSO 🔥

• prctl(2)
• PR_SET_MM(2const)
• PR_SET_MM_START_CODE(2const)
• PR_SET_MM_END_CODE(2const)
• PR_SET_MM_START_DATA(2const)
• PR_SET_MM_END_DATA(2const)
• PR_SET_MM_START_STACK(2const)
• PR_SET_MM_START_BRK(2const)
• PR_SET_MM_BRK(2const)
• PR_SET_MM_ARG_START(2const)
• PR_SET_MM_ARG_END(2const)
• PR_SET_MM_ENV_START(2const)
• PR_SET_MM_ENV_END(2const)
• PR_SET_MM_EXE_FILE(2const)

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and that's the whole page, bestie, you ate 💖 this lil drop came from Linux man-pages 6.20, dated 2026-02-08 — so go forth and map those descriptors, ily 🫶✨🎀