linux-kernel - Re: Splicing to/from a tty

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Date:   Mon, 18 Jan 2021 14:03:35 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Oliver Giles <ohw.giles@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: Splicing to/from a tty

On Mon, Jan 18, 2021 at 1:54 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> But it might well be some other conversion bug of mine even if I tried
> to keep it fairly minimal and straight-forward.

Duh. I completely forgot to handle the canon_copy_from_read_buf()
case. So ICANON mode was entirely scrogged and would just return
-EFAULT.

That would do it. I'm surprised how well everything I did actually
worked - because all my normal terminal apps (shell, editor etc)
obviously end up not using icanon at all.

I'll have a third patch in a moment, but while it's ready I want to
actually reboot and confirm it first.

             Linus