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Subject: Re: [PATCH v6 0/3] io_uring: add restrictions to support untrusted
 applications and guests
To:     Stefano Garzarella <sgarzare@redhat.com>
Cc:     Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        Jann Horn <jannh@google.com>, Jeff Moyer <jmoyer@redhat.com>,
        Aleksa Sarai <asarai@suse.de>,
        Sargun Dhillon <sargun@sargun.me>,
        linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>
References: <20200827145831.95189-1-sgarzare@redhat.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <8a86fc8a-56f6-351e-aaee-d80c4798d152@kernel.dk>
Date:   Thu, 27 Aug 2020 21:01:12 -0600
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On 8/27/20 8:58 AM, Stefano Garzarella wrote:
> v6:
>  - moved restriction checks in a function [Jens]
>  - changed ret value handling in io_register_restrictions() [Jens]
> 
> v5: https://lore.kernel.org/io-uring/20200827134044.82821-1-sgarzare@redhat.com/
> v4: https://lore.kernel.org/io-uring/20200813153254.93731-1-sgarzare@redhat.com/
> v3: https://lore.kernel.org/io-uring/20200728160101.48554-1-sgarzare@redhat.com/
> RFC v2: https://lore.kernel.org/io-uring/20200716124833.93667-1-sgarzare@redhat.com
> RFC v1: https://lore.kernel.org/io-uring/20200710141945.129329-1-sgarzare@redhat.com
> 
> 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:
> https://github.com/stefano-garzarella/liburing (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.

Applied, thanks.

-- 
Jens Axboe