linux-kernel - Re: [PATCH RESEND] tty: Require CAP_SYS_ADMIN for all usages of TIOCL

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Message-ID: <20250411.6070ec138c6c@gnoack.org>
Date: Fri, 11 Apr 2025 10:25:05 +0200
From: Günther Noack <gnoack3000@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jared Finder <jared@...der.org>,
	Jann Horn <jannh@...gle.com>,
	Hanno Böck <hanno@...eck.de>,
	Kees Cook <kees@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH RESEND] tty: Require CAP_SYS_ADMIN for all usages of
 TIOCL_SELMOUSEREPORT

Hello Greg, Jared and others!

On Fri, Apr 11, 2025 at 09:01:45AM +0200, Günther Noack wrote:
> This requirement was overeagerly loosened in commit 2f83e38a095f
> ("tty: Permit some TIOCL_SETSEL modes without CAP_SYS_ADMIN"),
> ...

For context, the links to the previous mail thread, where this patch
was a bit too "hidden" in a sub-thread:

Original patch:
https://lore.kernel.org/all/20250223205449.7432-2-gnoack3000@gmail.com/

Brief additional summary for why I consider this safe:
https://lore.kernel.org/all/20250307.9339126c0c96@gnoack.org

Thank you!
–Günther