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

[Ricardo Ribalda]

HI Matteo

On Wed, 28 Jun 2023 at 17:12, Matteo Rizzo <matteorizzo@xxxxxxxxxx> wrote:
>
> On Wed, 28 Jun 2023 at 13:44, Ricardo Ribalda <ribalda@xxxxxxxxxxxx> wrote:
> >
> > Have you considered that the new sysctl is "sticky like kexec_load_disabled.
> > When the user disables it there is no way to turn it back on until the
> > system is rebooted.
>
> Are you suggesting making this sysctl sticky? Are there any examples of how to
> implement a sticky sysctl that can take more than 2 values in case we want to
> add an intermediate level that still allows privileged processes to use
> io_uring? Also, what would be the use case? Preventing privileged processes
> from re-enabling io_uring?

Yes, if this sysctl is accepted, I think it would make sense to make it sticky.

For more than one value take a look to  kexec_load_limit_reboot and
kexec_load_limit_panic

Thanks!

>
> Thanks!
> --
> Matteo



-- 
Ricardo Ribalda