security_file_mprotect(9)

📦 version 7.3.1, in nixpkgs unstable

🦋 security_file_mprotect(9) 🦋

okay bestie, welcome to the Kernel API Manual entry for security_file_mprotect — yes, the title is also the function name, we love a self-titled icon. This is the hook that checks permissions before memory access permissions get changed, and I’m gonna walk you through it like we’re decoding the group chat. 💅

✨ NAME ✨

security_file_mprotect — Check if changing memory protections is allowed. That’s the official one-liner, and honestly it’s giving “bouncer at the memory club.” 🫶

📜 SYNOPSIS 📜

int security_file_mprotect (struct vm_area_struct *vma , unsigned long
       reqprot , unsigned long prot );

that’s the whole signature, spaces and line break included. no cap, don’t @ me. 🎀

🎀 ARGUMENTS 🎀

  • vma — memory region. like, the actual memory region being checked, bestie.
  • reqprot — application requested protection. the protection the application asked for.
  • prot — protection applied by the kernel. the protection the kernel actually applied.

💖 DESCRIPTION 💖

Check permissions before changing memory access permissions.

that’s it. that’s the whole job. it’s giving bouncer at the door, but for memory access permission changes. no extra lore on this page, so don’t go inventing behavior, bestie. 💀

✅ RETURN ✅

Returns 0 if permission is granted.

so the happy path is literally 0 = permission granted. if you were hoping for a whole table of extra return values, this page does not give you one. 🙈

👀 SEE ALSO 👀

okay this is the part where the manpage says “here’s the entire extended friend group.” The source file is ./security/security.c, and then there are… so many cross-refs. I kept every single one, no skips, no cap: 🌈

and that’s the full roster, bestie — no missing cross-refs, no mystery guests. 💜

this page came from source ./security and is dated October 2026. mwah, slay, periodt. 💋

📦 where this page comes from