linux-kernel - Re: [PATCH v3 0/1] Add a sysctl to disable io

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Date:   Tue, 11 Jul 2023 14:51:03 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        io-uring@...r.kernel.org, asml.silence@...il.com,
        Matteo Rizzo <matteorizzo@...gle.com>
Cc:     corbet@....net, akpm@...ux-foundation.org, keescook@...omium.org,
        ribalda@...omium.org, rostedt@...dmis.org, jannh@...gle.com,
        chenhuacai@...nel.org, gpiccoli@...lia.com, ldufour@...ux.ibm.com,
        evn@...gle.com, poprdi@...gle.com, jordyzomer@...gle.com,
        jmoyer@...hat.com, krisman@...e.de
Subject: Re: [PATCH v3 0/1] Add a sysctl to disable io_uring system-wide


On Fri, 30 Jun 2023 15:10:02 +0000, Matteo Rizzo wrote:
> Over the last few years we've seen many critical vulnerabilities in
> io_uring[1] which could be exploited by an unprivileged process to gain
> control over the kernel. This patch introduces a new sysctl which disables
> the creation of new io_uring instances system-wide.
> 
> The goal of this patch is to give distros, system admins, and cloud
> providers a way to reduce the risk of privilege escalation through io_uring
> where disabling it with seccomp or at compile time is not practical. For
> example a distro or cloud provider might want to disable io_uring by
> default and have users enable it again if they need to run a program that
> requires it. The new sysctl is designed to let a user with root on the
> machine enable and disable io_uring systemwide at runtime without requiring
> a kernel recompilation or a reboot.
> 
> [...]

Applied, thanks!

[1/1] io_uring: add a sysctl to disable io_uring system-wide
      commit: d55f54dac19a0cee1818353ab5aa3edac9034db4

Best regards,
-- 
Jens Axboe