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=-5.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 57AB2C433E7 for ; Wed, 14 Oct 2020 18:41:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E05502222C for ; Wed, 14 Oct 2020 18:41:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="g7sCEuPT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388353AbgJNSlM (ORCPT ); Wed, 14 Oct 2020 14:41:12 -0400 Received: from mout.gmx.net ([212.227.17.21]:39693 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729952AbgJNSlM (ORCPT ); Wed, 14 Oct 2020 14:41:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1602700866; bh=E5e0J3IsTfgYHsONFbE+n3IxfEdhDppSa1mJsTVFHXI=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=g7sCEuPTYMnuINPz7UFDFSxGR4+dD2pK5SQPLK0oj/viscj4BiZVveWGs/JdjOOgP bJmRKG3dnOkZ5G+L+HEXZnr9+xoDIIiu6UydOjbttaz4IIAE5+hWRLNyEclO7e/8Zh unTgbNB9VqFUwuQgiYavkZxpqGmHgJR4jCoeYpGA= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [192.168.123.70] ([178.202.41.107]) by mail.gmx.com (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MtfNf-1kBW6o3QIZ-00v5k0; Wed, 14 Oct 2020 20:41:05 +0200 Subject: Re: fwts: RuntimeServicesSupported variable To: Ard Biesheuvel Cc: Alex Hung , Colin Ian King , Ivan Hu , linux-efi , fwts-devel@lists.ubuntu.com References: <4898db16-7f9b-2efc-a5ae-356461d790b8@gmx.de> <4b74c0b7-7126-2829-29d3-ef5131c52b73@gmx.de> From: Heinrich Schuchardt Autocrypt: addr=xypron.glpk@gmx.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:FLr6Ved2UwTeMtskp6LJi+ccvq7/QNUaQP4tfA3S2qEDt1muCF0 jKf/wY3EW2Xnsq5eRoc1cJx3cttZCRtcgkFDWMx3Vhl2XwZPIHX3VscMqh3SerP8NT1wf5S Gx0b8rRAqgWPHSyAt+Zq0Wg2+IT40fkahaeLNui03IsBrw0SiVbfF2fYN8zgx5VTbzqHhOM ILnX3XKXfHfVjhNZ1P2cQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:kiV7Dg7Fwpc=:YajGXj/gjtdy9TJ0z/hsuv 9wtE4Zp/Yohp390IkZbIs9H1uBIWPaRKeQWcBqeK6TsYIZzrYn7gkXVZeooPxiVIHPG8cUjoX Q6TOf2TF3Kz8Mkj4YY9JKimLH/gLSwqEgKjQwLWwKI0tSH+F62wdV+mJJm+ERRfhF5YCbmrIL ufM8mWg63v8n8gEo/CxJTBkjOkxOm73HIiFIxxWLnl1j6ovxlLmznmB3TxTSdQEiIaBOh5v/7 7MDT8gbOM7MkmN9yNxwlyzCsodL9hTa7r6mOEPOve/HsWJEuSncMoyTj5nPZKxuNLQcOAcrHj Uptq0iJaFaqegLBhh/qGBhXsa3GKLwfltE/NZkdSZD9Dhv9ozG2t1Rv/FOpnejZYnrssGAeik F5/Ac1ldT5wQYqB4i8AmOy+cv+yhBLqpKY4ouPbznd1RArrclk28YtuCdOcGG4UWutWYuzgnQ oWlvMZ3oOBrKX3s3Y3f0UvkNrScpmYiEiB+wqvVkfvZNNgiFHYy+qUefvx9nO84x90+zhuFaw LZpdVZC4EDsjP4AGKoSC/nCrrVcTk8yXqKMSmXzaTopJcCMazGwHmjH1lUIw730LbYaPlOdtS hOwa0nZnhizT1OZQIFaSMX3/KPH7+Ohqj9tT4MWK0JpDajbm+L8Ga01mQ/kPrYG/4J8QWWn7F 8fSE0cg5vgK85okII4sU61utF2YIrGjF4U82OpKw2FfnUdrBjG5ELuAIkXrK4N+N5hqPG/0kS vpWTaNpIQFAdZ1UDX5d5HqEKqZE0HPENN8/6gFn9iCQjpNx2sGDj/TxHjUPAqmFinzq9SLhSC qVy6xzSR5W5e92eAeNJe68mmSrSjDbhOPtl+4MHnmL7jX9vTPuUo7SjHNbYEViKIU3zyxG+u8 DXj4iTDm2Lh35ghej53A== Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org On 14.10.20 19:58, Ard Biesheuvel wrote: > On Wed, 14 Oct 2020 at 19:45, Heinrich Schuchardt w= rote: >> >> On 14.10.20 19:31, Heinrich Schuchardt wrote: >>> Dear all, >>> >>> the fwts fails on U-Boot due to testing for a non-existent >>> RuntimeServicesSupported variable. >>> >>> If you look at the UEFI specification 2.8 (Errata B) [1] you will >>> discover in the change log: >>> >>> 2.8 A2049 >>> RuntimeServicesSupported EFI variable should be a config table >>> February 2020 >>> >>> Please, read the configuration table to determine if a runtime service >>> is available on UEFI 2.8 systems. >>> >>> On lower UEFI firmware version neither the variable nor the table exis= ts. >>> >>> Best regards >>> >>> Heinrich >>> >>> [1] UEFI Specification Version 2.8 (Errata B) (released June 2020), >>> https://uefi.org/sites/default/files/resources/UEFI%20Spec%202.8B%20Ma= y%202020.pdf >>> >> >> Hello Ard, >> >> what is your idea how the EFI_RT_PROPERTIES_TABLE shall be exposed to >> the efi_test driver? >> >> Will the EFI runtime wrapper simply return EFI_UNSUPPORTED if the >> function is not marked as supported in the table? Or will the >> configuration table itself be make available? >> > > The UEFI spec permits that runtime services return EFI_UNSUPPORTED at > runtime, but requires that they are marked as such in the > EFI_RT_PROPERTIES_TABLE. > > So assuming that the purpose of efi_test is compliance with the spec, > it should only allow EFI_UNSUPPORTED as a return value for each of the > tested runtime services if it is omitted from > efi.runtime_supported_mask. > > Since the efi_test ioctl returns both an error code and the actual EFI > status code, we should only fail the call on a EFI_UNSUPPORTED status > code if the RTPROP mask does not allow that. > > E.g., > > --- a/drivers/firmware/efi/test/efi_test.c > +++ b/drivers/firmware/efi/test/efi_test.c > @@ -265,7 +265,12 @@ static long efi_runtime_set_variable(unsigned long = arg) > goto out; > } > > - rv =3D status =3D=3D EFI_SUCCESS ? 0 : -EINVAL; > + if (status =3D=3D EFI_SUCCESS || > + (status =3D=3D EFI_UNSUPPORTED && > + !efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE))) > + rv =3D 0; > + else > + rv =3D -EINVAL; > > out: > kfree(data); > > > Do you think that could work? > The current fwts implementation assumes that EFI_UNSUPPORTED leads to ioctl() returning -1. This value should not be changed. It would be preferable to use another error code than -EINVAL, e.g. -EDOM if there is a mismatch with the EFI_RT_PROPERTIES_TABLE configuration table. Then a future verision of fwts can evaluate errno to discover the problem. Do I read you correctly: the EFI runtime wrapper does not fend of calls to runtime services marked as disallowed in EFI_RT_PROPERTIES_TABLE? Directly returning an error code might help to avoid crashes on non-compliant firmware. Best regards Heinrich