linux-kernel - Re: Request to backport "sysctl: fix proc_dobool() usability" to stable kernels

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Date:   Sun, 5 Mar 2023 03:06:12 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Storm Dragon <stormdragon2976@...il.com>
Cc:     stable@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: Request to backport "sysctl: fix proc_dobool() usability" to
 stable kernels

On Sat, Mar 04, 2023 at 09:51:49PM -0500, Storm Dragon wrote:
> On Sun, Mar 05, 2023 at 02:18:11AM +0000, Thomas Weißschuh wrote:
> > This ioctl is used for the copy-and-paste functionality of the
> > screenreader "fenrir".
> > ( https://github.com/chrys87/fenrir )
> > 
> > Reported-by: Storm Dragon <stormdragon2976@...il.com>
> > Link: https://lore.kernel.org/lkml/ZAOi9hDBTYqoAZuI@hotmail.com/
> 
> I believe this will also cause some loss of functionality in brltty as
> well:
> 
> https://brltty.app

The documentation of brltty indicates that they only use TIOCSTI as
fallback. By default a virtual keyboard device is used to simulate
typing.


Maybe it would also make sense to open a ticket to ArchLinux to enable
CONFIG_LEGACY_TIOCSTI again, as per the kernel default.

In accordance with the options help text:

"Say 'Y here only if you have confirmed that yout system's userspace
depends on this functionality to continue operating normally"

Could you create such a ticket if think it's necessary?