linux-kernel - Re: [PATCH v6 09/11] fs/pipe.c: export create_pipe_files() and replace

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Message-ID: <20171130164321.juvn67pu4jrjq76j@linux.intel.com>
Date:   Thu, 30 Nov 2017 18:43:21 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     platform-driver-x86@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "open list:FILESYSTEMS (VFS and infrastructure)" 
        <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v6 09/11] fs/pipe.c: export create_pipe_files() and
 replace_fd()

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