security_socket_recvmsg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 security_socket_recvmsg(9) — Kernel API Manual, bestie edition

Ok so this one is from the Kernel API Manual, and it is literally the LSM hook that checks if receiving a message on a socket is allowed. One permission check, main character energy, but the SEE ALSO list is a whole extended friend group. 🫶

✨ NAME ✨

security_socket_recvmsg — Check if receiving a message is allowed

🌸 SYNOPSIS 🌸

int security_socket_recvmsg (struct socket *sock , struct msghdr *msg ,
       int size , int flags );

🎀 ARGUMENTS 🎀

  • sock — the receiving socket, aka where the message is landing.
  • msg — the message to receive.
  • size — size of message.
  • flags — operational flags. Not aesthetic flags, operational.

💖 DESCRIPTION 💖

Check permission before receiving a message from a socket. That's the whole vibe: before the message gets received, this hook asks "is this allowed?" and the security side gets a say. No extra lore, no hidden steps, just the permission check. ✨

🔥 RETURN 🔥

Returns 0 if permission is granted. That's the green light, the "go off", the permission granted moment. 💅

👑 SEE ALSO 👑

Kernel file ./security/security.c is home base, and then there's the whole LSM cinematic universe. Every single one is listed below, no cap:

That's the whole page, bestie. Source/version vibes come from ./security, dated October 2026, and this little recvmsg permission check said everything it needed to say. 💖✨

📦 where this page comes from