From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0EE3EEB64D9 for ; Thu, 29 Jun 2023 13:24:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231691AbjF2NYP convert rfc822-to-8bit (ORCPT ); Thu, 29 Jun 2023 09:24:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231496AbjF2NYP (ORCPT ); Thu, 29 Jun 2023 09:24:15 -0400 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1532C2D4A for ; Thu, 29 Jun 2023 06:24:13 -0700 (PDT) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-54-8rh9MoxjMk2CwbwNRMsZVQ-1; Thu, 29 Jun 2023 14:23:55 +0100 X-MC-Unique: 8rh9MoxjMk2CwbwNRMsZVQ-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Thu, 29 Jun 2023 14:23:54 +0100 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Thu, 29 Jun 2023 14:23:54 +0100 From: David Laight To: 'Samuel Thibault' , Kees Cook CC: Kees Cook , Greg Kroah-Hartman , Jiri Slaby , Simon Brand , "linux-kernel@vger.kernel.org" , "linux-hardening@vger.kernel.org" , "Dave@mielke.cc" Subject: RE: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled Thread-Topic: [PATCH v3 2/2] tty: Allow TIOCSTI to be disabled Thread-Index: AQHZqZu1MI//nXKQnEKNH07rOK4tp6+hxWvQ Date: Thu, 29 Jun 2023 13:23:54 +0000 Message-ID: <55c209a024a94d1f9c6af85dfddb11a0@AcuMS.aculab.com> References: <20221022182828.give.717-kees@kernel.org> <20221022182949.2684794-2-keescook@chromium.org> <20221227234000.jgosvixx7eahqb3z@begin> <20221228205726.rfevry7ud6gmttg5@begin> <20230625155625.s4kvy7m2vw74ow4i@begin> <202306271944.E80E1D0@keescook> <20230628060716.vvgtlgbushyjh6km@begin> In-Reply-To: <20230628060716.vvgtlgbushyjh6km@begin> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org From: Samuel Thibault > Sent: 28 June 2023 07:07 ... > > So is there really no solution for brltty and TIOCSTI being disabled? > > No, there is no way to simulate characters on the Linux console. The > alternative would be to use uinput, but that simulates keycodes, not > characters, thus requiring backtranslating first, which is very fragile. It could probably be rewritten to use a pseudo-tty pair. It might even be possible to emulate (the functionality of) TIOCSTI in the relay process that handles the pseudo-tty. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)