TEE_IOC_SHM_REGISTER(9)

💖 TEE_IOC_SHM_REGISTER — a little kernel API page, bestie edition 💖

okay so this one lives in the Kernel API Manual, section 9, and it's short but honestly kind of iconic? let's get into it 🫶

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✨ NAME ✨

TEE_IOC_SHM_REGISTER — register a shared memory argument 🎀

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✨ SYNOPSIS ✨

TEE_IOC_SHM_REGISTER

that's it. that's the whole synopsis. no arguments listed, no flags, just vibes and an ioctl name 💅

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✨ DESCRIPTION ✨

okay so what this does: it registers shared memory between the user space process and the secure OS. that's the whole thing. user space and the secure world, sharing memory, officially, on the record ✨

it returns a file descriptor on success, or < 0 on failure. so if you get a number back that's ≥ 0, congratulations bestie, you're slaying. if it's negative, it's giving error energy 😭

and here's the part you literally cannot forget: the shared memory is unregistered when the descriptor is closed. like, closing the fd is the cleanup. don't lose track of that fd, don't leak it, and don't be surprised when the memory goes away the second you close it. no cap. 🦋

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✨ SEE ALSO ✨

the whole squad, in the order the page gives them, no one gets left out 💜

• Kernel file ./include/uapi/linux/tee.h
• struct tee_ioctl_version_data(9)
• TEE_IOC_VERSION(9)
• struct tee_ioctl_shm_alloc_data(9)
• TEE_IOC_SHM_ALLOC(9)
• struct tee_ioctl_buf_data(9)
• struct tee_ioctl_param(9)
• struct tee_ioctl_open_session_arg(9)
• TEE_IOC_OPEN_SESSION(9)
• struct tee_ioctl_invoke_arg(9)
• TEE_IOC_INVOKE(9)
• struct tee_ioctl_cancel_arg(9)
• TEE_IOC_CANCEL(9)
• struct tee_ioctl_close_session_arg(9)
• TEE_IOC_CLOSE_SESSION(9)
• struct tee_iocl_supp_recv_arg(9)
• TEE_IOC_SUPPL_RECV(9)
• struct tee_iocl_supp_send_arg(9)
• TEE_IOC_SUPPL_SEND(9)
• struct tee_ioctl_shm_register_data(9)
• struct tee_ioctl_shm_register_fd_data(9)
• TEE_IOC_SHM_REGISTER_FD(9)
• struct tee_ioctl_object_invoke_arg(9)

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kisses, this page came from ./include/uapi/linux and it's dated October 2026 — that's the source, that's the version, and that's the whole page. mwah 💋✨