Re: [PATCH v6 09/11] fs/pipe.c: export create_pipe_files() and replace_fd()

[Jarkko Sakkinen]

On Wed, Nov 29, 2017 at 03:13:57PM -0800, Christoph Hellwig wrote:
> On Tue, Nov 28, 2017 at 11:57:53PM +0200, Jarkko Sakkinen wrote:
> > > Yes.  You still shall not play nasty games with file descriptors.
> > 
> > I need to put something to file descriptors in order to have a IO
> > channels for the launch enclave hosting process.
> 
> Just do it like any other program - open it from your userspace
> program using open() and related syscalls.

In this case it would not work as the launch enclave is still part of
the kernel and it would create a dependency how the user space defines
paths. If using pipe specifically is an issue, I could easily use shmem
file as a mean for communiation.

The way I implemented is much like how I did arch/x86/realmode with HPA
and it has kind of comparable requirements, part of the kernel but not
exactly code living in the kernel namespace.

/Jarkko