Re: [PATCH 1/1] Add a new sysctl to disable io_uring system-wide

[Bart Van Assche]

On 6/27/23 05:00, Matteo Rizzo wrote:
> +Prevents all processes from creating new io_uring instances. Enabling this
> +shrinks the kernel's attack surface.
> +
> += =============================================================
> +0 All processes can create io_uring instances as normal. This is the default
> +  setting.
> +1 io_uring is disabled. io_uring_setup always fails with -EPERM. Existing
> +  io_uring instances can still be used.
> += =============================================================

I'm using fio + io_uring all the time on Android devices. I think we need a
better solution than disabling io_uring system-wide, e.g. a mechanism based
on SELinux that disables io_uring for apps and that keeps io_uring enabled
for processes started via 'adb root && adb shell ...'

Bart.