Re: [PATCH 3/7] Add a UFFD_SECURE flag to the userfaultfd API.

[Andrea Arcangeli]

On Wed, Oct 23, 2019 at 04:01:53PM -0700, Andy Lutomirski wrote:
> Delivering events through read() is just fine. The problem is when
> delivering an event does more than just returning bytes. As far as
> Iâve noticed, uffdâs read() just returns bytes as long as FORK is
> disabled.

Yes, fork is the only case where read doesn't return bytes.

Moving only the fd creation to a separate syscall would then avoid
involuntary creation of the fd.