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Date: Thu, 27 Aug 2020 08:10:49 -0600
From: Jens Axboe <>
To: Stefano Garzarella <>
Cc: Aleksa Sarai <>,
 Kernel Hardening <>,
 Jann Horn <>,,
 Christian Brauner <>,, Alexander Viro <>,
 Stefan Hajnoczi <>,,
 Sargun Dhillon <>, Kees Cook <>,
 Jeff Moyer <>
Subject: Re: [PATCH v5 0/3] io_uring: add restrictions to support untrusted
 applications and guests

On 8/27/20 8:10 AM, Stefano Garzarella wrote:
> On Thu, Aug 27, 2020 at 07:50:44AM -0600, Jens Axboe wrote:
>> On 8/27/20 7:40 AM, Stefano Garzarella wrote:
>>> v5:
>>>  - explicitly assigned enum values [Kees]
>>>  - replaced kmalloc/copy_from_user with memdup_user [kernel test robot]
>>>  - added Kees' R-b tags
>>> v4:
>>> v3:
>>> RFC v2:
>>> RFC v1:
>>> Following the proposal that I send about restrictions [1], I wrote this series
>>> to add restrictions in io_uring.
>>> I also wrote helpers in liburing and a test case (test/register-restrictions.c)
>>> available in this repository:
>>> (branch: io_uring_restrictions)
>>> Just to recap the proposal, the idea is to add some restrictions to the
>>> operations (sqe opcode and flags, register opcode) to safely allow untrusted
>>> applications or guests to use io_uring queues.
>>> The first patch changes io_uring_register(2) opcodes into an enumeration to
>>> keep track of the last opcode available.
>>> The second patch adds IOURING_REGISTER_RESTRICTIONS opcode and the code to
>>> handle restrictions.
>>> The third patch adds IORING_SETUP_R_DISABLED flag to start the rings disabled,
>>> allowing the user to register restrictions, buffers, files, before to start
>>> processing SQEs.
>>> Comments and suggestions are very welcome.
>> Looks good to me, just a few very minor comments in patch 2. If you
>> could fix those up, let's get this queued for 5.10.
> Sure, I'll fix the issues. This is great :-)

Thanks! I'll pull in your liburing tests as well once we get the kernel
side sorted.

Jens Axboe

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