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

From: Xiaoming Ni
Date: Wed May 27 2020 - 02:54:22 EST

On Tue, Mar 19, 2019 at 11:07:22AM +0800, Peter Xu 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.

I am a bit confused about this patch, can you help to answer it.

Why the sysctl interface of fs/userfaultfd.c belongs to vm_table instead of fs_table ?

Xiaoming Ni