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Date: Thu, 7 Jan 2021 09:39:32 +0100
From: Stefano Garzarella <>
To: Daurnimator <>
Cc: Jens Axboe <>,
	Kernel Hardening <>,
	Christian Brauner <>,
	io-uring <>,
	Alexander Viro <>,
	Stefan Hajnoczi <>, Jann Horn <>,
	Jeff Moyer <>, Aleksa Sarai <>,
	Sargun Dhillon <>,,
	Kees Cook <>
Subject: Re: [PATCH v6 2/3] io_uring: add IOURING_REGISTER_RESTRICTIONS opcode

On Mon, Jan 04, 2021 at 01:26:41AM +1100, Daurnimator wrote:
>On Fri, 28 Aug 2020 at 00:59, Stefano Garzarella <> wrote:
>> +               __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */
>Can you confirm that this intentionally limited the future range of
>IORING_REGISTER opcodes to 0-255?

It was based on io_uring_probe, so we used u8 for opcodes, but we have 
room to extend it in the future.

So, for now, this allow to register restrictions up to 255 

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