linux-kernel - Re: [PATCH 24/32] vfs: syscall: Add fsopen() to prepare for superblock creation [ver #9]

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Date:   Thu, 12 Jul 2018 13:36:22 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Andrew Lutomirski <luto@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH 24/32] vfs: syscall: Add fsopen() to prepare for
 superblock creation [ver #9]

On Thu, Jul 12, 2018 at 1:34 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> This is the whole "write() is only for data". If you ever have
> credentials mattering at write time, you're doing something wrong.
>
> Really really.
>
> Don't do it.

.. and I'd like to repeat: we *have* done things wrong. But that's
simply not an excuse. We've done it wrong in SCSI, we've done it wrong
in various /proc files, we've done it wrong in many places.

But let's not do it wrong AGAIN.

                Linus