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=-4.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 9CF14C433DF for ; Tue, 4 Aug 2020 14:39:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 874E622B42 for ; Tue, 4 Aug 2020 14:39:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728112AbgHDOjx (ORCPT ); Tue, 4 Aug 2020 10:39:53 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:26176 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727887AbgHDOd2 (ORCPT ); Tue, 4 Aug 2020 10:33:28 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-248-oxN4WAsRPH-FrBjdql4G-A-1; Tue, 04 Aug 2020 15:33:07 +0100 X-MC-Unique: oxN4WAsRPH-FrBjdql4G-A-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 4 Aug 2020 15:33:06 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 4 Aug 2020 15:33:06 +0100 From: David Laight To: 'Mark Rutland' , "Madhavan T. Venkataraman" CC: Andy Lutomirski , Kernel Hardening , Linux API , linux-arm-kernel , Linux FS Devel , linux-integrity , LKML , "LSM List" , Oleg Nesterov , X86 ML Subject: RE: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor Thread-Topic: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor Thread-Index: AQHWamb6T+e4gDrzGEmP/30MMvDTCqkoApyQ Date: Tue, 4 Aug 2020 14:33:06 +0000 Message-ID: References: <20200728131050.24443-1-madvenka@linux.microsoft.com> <6540b4b7-3f70-adbf-c922-43886599713a@linux.microsoft.com> <46a1adef-65f0-bd5e-0b17-54856fb7e7ee@linux.microsoft.com> <20200731183146.GD67415@C02TD0UTHF1T.local> <86625441-80f3-2909-2f56-e18e2b60957d@linux.microsoft.com> <20200804135558.GA7440@C02TD0UTHF1T.local> In-Reply-To: <20200804135558.GA7440@C02TD0UTHF1T.local> Accept-Language: en-GB, en-US Content-Language: 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 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PiA+IElmIHlvdSBsb29rIGF0IHRoZSBsaWJmZmkgcmVmZXJlbmNlIHBhdGNoIEkgaGF2ZSBpbmNs dWRlZCwgdGhlIGFyY2hpdGVjdHVyZQ0KPiA+IHNwZWNpZmljIGNoYW5nZXMgdG8gdXNlIHRyYW1w ZmQganVzdCBpbnZvbHZlIGEgc2luZ2xlIEMgZnVuY3Rpb24gY2FsbCB0bw0KPiA+IGEgY29tbW9u IGNvZGUgZnVuY3Rpb24uDQoNCk5vIGlkZWEgd2hhdCBsaWJmZmkgaXMsIGJ1dCBpdCBtdXN0IHN1 cmVseSBiZSBzaW1wbGVyIHRvDQpyZXdyaXRlIGl0IHRvIGF2b2lkIG5lc3RlZCBmdW5jdGlvbiBk ZWZpbml0aW9ucy4NCg0KT3IgZmluZCBhIGJvb2sgZnJvbSB0aGUgMTk2MHMgb24gaG93IHRvIGRv IHJlY3Vyc2l2ZQ0KY2FsbHMgYW5kIG5lc3RlZCBmdW5jdGlvbnMgaW4gRk9SVFJBTi1JVi4NCg0K CURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBN b3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAx Mzk3Mzg2IChXYWxlcykNCg== 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=-4.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 9441AC433DF for ; Tue, 4 Aug 2020 14:34:29 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 69E2E2177B for ; Tue, 4 Aug 2020 14:34:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Smfdlw3j" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69E2E2177B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=ACULAB.COM Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EW9ALCx5Vvph+3AfzhWQvX4q6yaLnU5aF7lZT4FlGvM=; b=Smfdlw3j4YBihb7SUgU1hkK7g YHgeCO1oaOFBF9dpHf1aB+WzJwqTRWnZ/NHXXmFWy/qYr7SfPkaJ9SJ0jrwFktLhcdBLjMg3bBKA/ ZBwmb58hWyHDQQTMwnWpn0DfmaOnpmEV9cnUhUZ9M/3dx0FeyT5u+kpwgS9BTLWERMfRzmvaAH3mO uzAKqO7e9XguTdV6Ie0p4NnfkKvWdq2qmGSzUWiElDisp4d1SPZ9wuByslFjnbNAVFKp5G+UCUK1M urUT3JGgRt9JgQF5j1QHzMa0YD0KgI2EPXhbwDjUyoetEYXmHW5rNXYfJz0JBeFXnIj9FiR1d/oXH cqETmTAng==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k2y0C-0006oN-A5; Tue, 04 Aug 2020 14:33:16 +0000 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k2y08-0006mu-Go for linux-arm-kernel@lists.infradead.org; Tue, 04 Aug 2020 14:33:13 +0000 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-248-oxN4WAsRPH-FrBjdql4G-A-1; Tue, 04 Aug 2020 15:33:07 +0100 X-MC-Unique: oxN4WAsRPH-FrBjdql4G-A-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 4 Aug 2020 15:33:06 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Tue, 4 Aug 2020 15:33:06 +0100 From: David Laight To: 'Mark Rutland' , "Madhavan T. Venkataraman" Subject: RE: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor Thread-Topic: [PATCH v1 0/4] [RFC] Implement Trampoline File Descriptor Thread-Index: AQHWamb6T+e4gDrzGEmP/30MMvDTCqkoApyQ Date: Tue, 4 Aug 2020 14:33:06 +0000 Message-ID: References: <20200728131050.24443-1-madvenka@linux.microsoft.com> <6540b4b7-3f70-adbf-c922-43886599713a@linux.microsoft.com> <46a1adef-65f0-bd5e-0b17-54856fb7e7ee@linux.microsoft.com> <20200731183146.GD67415@C02TD0UTHF1T.local> <86625441-80f3-2909-2f56-e18e2b60957d@linux.microsoft.com> <20200804135558.GA7440@C02TD0UTHF1T.local> In-Reply-To: <20200804135558.GA7440@C02TD0UTHF1T.local> Accept-Language: en-GB, en-US Content-Language: 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 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200804_103312_763547_7FEF6E25 X-CRM114-Status: UNSURE ( 9.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kernel Hardening , Linux API , X86 ML , LKML , Oleg Nesterov , LSM List , Andy Lutomirski , Linux FS Devel , linux-integrity , linux-arm-kernel Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > > If you look at the libffi reference patch I have included, the architecture > > specific changes to use trampfd just involve a single C function call to > > a common code function. No idea what libffi is, but it must surely be simpler to rewrite it to avoid nested function definitions. Or find a book from the 1960s on how to do recursive calls and nested functions in FORTRAN-IV. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel