Re: [PATCH v2 1/1] userfaultfd/sysctl: add vm.unprivileged_userfaultfd

[Kees Cook]

On Tue, Mar 19, 2019 at 11:02 AM Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Tue, 19 Mar 2019 11:07:22 +0800 Peter Xu <peterx@xxxxxxxxxx> wrote:
>
> > Add a global sysctl knob "vm.unprivileged_userfaultfd" to control
> > whether userfaultfd is allowed by unprivileged users.  When this is
> > set to zero, only privileged users (root user, or users with the
> > CAP_SYS_PTRACE capability) will be able to use the userfaultfd
> > syscalls.
>
> Please send along a full description of why you believe Linux needs
> this feature, for me to add to the changelog.  What is the benefit to
> our users?  How will it be used?
>
> etcetera.  As it was presented I'm seeing no justification for adding
> the patch!

Was there a v3 of this patch? I'd still really like to have this knob added. :)

Thanks!

-- 
Kees Cook