linux-kernel - Re: [PATCH v4 3/3] io_uring: allow disabling rings during the creation

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Message-ID: <202008261248.BB37204250@keescook>
Date:   Wed, 26 Aug 2020 12:50:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Jann Horn <jannh@...gle.com>, Jeff Moyer <jmoyer@...hat.com>,
        linux-fsdevel@...r.kernel.org, Sargun Dhillon <sargun@...gun.me>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Aleksa Sarai <asarai@...e.de>,
        io-uring@...r.kernel.org
Subject: Re: [PATCH v4 3/3] io_uring: allow disabling rings during the
 creation

On Thu, Aug 13, 2020 at 05:32:54PM +0200, Stefano Garzarella wrote:
> This patch adds a new IORING_SETUP_R_DISABLED flag to start the
> rings disabled, allowing the user to register restrictions,
> buffers, files, before to start processing SQEs.
> 
> When IORING_SETUP_R_DISABLED is set, SQE are not processed and
> SQPOLL kthread is not started.
> 
> The restrictions registration are allowed only when the rings
> are disable to prevent concurrency issue while processing SQEs.
> 
> The rings can be enabled using IORING_REGISTER_ENABLE_RINGS
> opcode with io_uring_register(2).
> 
> Suggested-by: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

Where can I find the io_uring selftests? I'd expect an additional set of
patches to implement the selftests for this new feature.

-- 
Kees Cook