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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
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