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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE5FDC2D0A8 for ; Wed, 23 Sep 2020 18:11:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 461FD235F7 for ; Wed, 23 Sep 2020 18:11:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726582AbgIWSLl (ORCPT ); Wed, 23 Sep 2020 14:11:41 -0400 Received: from mother.openwall.net ([195.42.179.200]:60269 "HELO mother.openwall.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1726228AbgIWSLl (ORCPT ); Wed, 23 Sep 2020 14:11:41 -0400 Received: (qmail 8044 invoked from network); 23 Sep 2020 18:11:39 -0000 Received: from localhost (HELO pvt.openwall.com) (127.0.0.1) by localhost with SMTP; 23 Sep 2020 18:11:39 -0000 Received: by pvt.openwall.com (Postfix, from userid 503) id 73B4DAB844; Wed, 23 Sep 2020 20:11:36 +0200 (CEST) Date: Wed, 23 Sep 2020 20:11:36 +0200 From: Solar Designer To: Florian Weimer Cc: Pavel Machek , madvenka@linux.microsoft.com, kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, oleg@redhat.com, x86@kernel.org, luto@kernel.org, David.Laight@ACULAB.COM, mark.rutland@arm.com, mic@digikod.net, Rich Felker Subject: Re: [PATCH v2 0/4] [RFC] Implement Trampoline File Descriptor Message-ID: <20200923181136.GA8846@openwall.com> References: <20200922215326.4603-1-madvenka@linux.microsoft.com> <20200923081426.GA30279@amd> <20200923091456.GA6177@openwall.com> <87wo0ko8v0.fsf@oldenburg2.str.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87wo0ko8v0.fsf@oldenburg2.str.redhat.com> User-Agent: Mutt/1.4.2.3i Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Wed, Sep 23, 2020 at 04:39:31PM +0200, Florian Weimer wrote: > * Solar Designer: > > > While I share my opinion here, I don't mean that to block Madhavan's > > work. I'd rather defer to people more knowledgeable in current userland > > and ABI issues/limitations and plans on dealing with those, especially > > to Florian Weimer. I haven't seen Florian say anything specific for or > > against Madhavan's proposal, and I'd like to. (Have I missed that?) [...] > I think it's unnecessary for the libffi use case. [...] > I don't know if kernel support could > make sense in this context, but it would be a completely different > patch. Thanks. Are there currently relevant use cases where the proposed trampfd would be useful and likely actually made use of by userland - e.g., specific userland project developers saying they'd use it, or Madhavan intending to develop and contribute userland patches? Alexander