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

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Date:   Sun, 5 Mar 2023 02:18:11 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     stable@...r.kernel.org
Cc:     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,
        Storm Dragon <stormdragon2976@...il.com>
Subject: Request to backport "sysctl: fix proc_dobool() usability" to stable
 kernels

Hi -stable team,

please backport the commit f1aa2eb5ea05 ("sysctl: fix proc_dobool() usability")
to the stable kernels containing commit 83efeeeb3d04 ("tty: Allow TIOCSTI to be disabled").
(Which seems only to be the 6.2 branch only at the moment)

Without this backport the sysctl dev.net.legacy_tiocsti to enable
ioctl(TIOCSTI) is not functional. So on kernels that don't enable
CONFIG_LEGACY_TIOCSTI, ioctl(TIOCSTI) is not usable at all.

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/