From patchwork Fri Apr 22 17:39:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aditya Garg X-Patchwork-Id: 12823927 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 4180FC433EF for ; Fri, 22 Apr 2022 17:45:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229920AbiDVRsI (ORCPT ); Fri, 22 Apr 2022 13:48:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234528AbiDVRrx (ORCPT ); Fri, 22 Apr 2022 13:47:53 -0400 Received: from IND01-BMX-obe.outbound.protection.outlook.com (mail-bmxind01olkn2082d.outbound.protection.outlook.com [IPv6:2a01:111:f403:7011::82d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B7E6D2AD; Fri, 22 Apr 2022 10:44:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=U0iR1/aoyLcZPuFZv282SZUnGH1523Ft+3TQCN/kbPgg0VRfNSC1Gd/4nLYl+KErLzfGgFooVsewhMmSnIvCBvBlIwkKriyEn9wE2Fe9+SFEKDMcrIA8FFf3+oXR+YHnXdWatL7LlgAwGBkle17mDpET9JElh61CKzfQxpQFMMbCVe+8yYnB+fLyLBuSXC50S1f9ZNRax4djVzN6fe5WZ6pMhJ8cR+Gzx/9c233+9z/cYO81gYangHCg1GgqKsmiuxMjl6wigOpO4Vf+B+GNpxkul05EkIgHM4RInm9/7yEcH93+Q1DnX62MNMoyAYbYdzL2/IQZYX0nNPt+uU+9rg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=u1KFyICb1KBU4A7oOn9tY7K4r2OyuSHdK/CPyRic/9Y=; b=lRmcjfFLBEGV13tjMvDhXUBGXLloOgWZhtRC/Ar4za7lrta8IuBJmyeyP5/oicXGarVytnzgAPN+X+xHuUwaD9fG5HqWwkxUXZUqWYVMLGcBVmNPPN6ZWWFcpy62aQRsIew3oPKJelFbry2RMdmfouGOctJdo4xCWBHMgbwmIhdDFRulr3rbj+JTzN/FJ93hL/LvWu4XVxjVE9UMkEpWENfs67t2bLJe50Pfl7VHLVhf1h9akhI2dKO9TesSuf1wOSaqmwAbkiZ5t/5O4gPR4IA1bsyKpbOlzNPT/2txzla1x1O5Mc7/9296pcHdFa5gcmw4V+MWWR3ZW7VZiT11mA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=live.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=u1KFyICb1KBU4A7oOn9tY7K4r2OyuSHdK/CPyRic/9Y=; b=Ui9DLHmWjts9SEd9BFmONG+Kri45HVyGUxU735RciqGBFhRfdbPZH9ic60W7H2DmN4R58K9lh/0UpgvMV9WktHtbLJ8/+9IA4H6vf+WDiwu67zQPcW+9nsjLtZf+GKThFpeNuafVk3ois7CvIpTPkg7YcjKLj1pA59s23x+6Z3NMrRWcUXEaM8mBhKBFqB9GNTnuEWbimteWnbCLNPDirYfacexLqba/J6WmqWH6BTkUJP2olm6NkxCsQaXTXYBEOEHi7V/WXSWn5v50YSwf/eDV7mGNOTQQNc0VpRtiNcvNqirjO7LsDzM8Vcj+mAXCZnl0jGnqRUpEgZg36ZfqfA== Received: from PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:1b::13) by PN0PR01MB7952.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:44::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5186.13; Fri, 22 Apr 2022 17:39:20 +0000 Received: from PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM ([fe80::3d8a:448e:5dc6:510a]) by PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM ([fe80::3d8a:448e:5dc6:510a%6]) with mapi id 15.20.5186.015; Fri, 22 Apr 2022 17:39:20 +0000 From: Aditya Garg To: "jarkko@kernel.org" , "zohar@linux.ibm.com" , "dmitry.kasatkin@gmail.com" , "jmorris@namei.org" , "serge@hallyn.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "kafai@fb.com" , "songliubraving@fb.com" , "yhs@fb.com" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" CC: "linux-integrity@vger.kernel.org" , "keyrings@vger.kernel.org" , "linux-security-module@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" , "bpf@vger.kernel.org" , Orlando Chamberlain , "admin@kodeit.net" , "stable@vger.kernel.org" Subject: [PATCH v7 RESEND] efi: Do not import certificates from UEFI Secure Boot for T2 Macs Thread-Topic: [PATCH v7 RESEND] efi: Do not import certificates from UEFI Secure Boot for T2 Macs Thread-Index: AQHYVm/lf8oZJ0+bFUqnMcRigUBj+g== Date: Fri, 22 Apr 2022 17:39:19 +0000 Message-ID: References: <652C3E9E-CB97-4C70-A961-74AF8AEF9E39@live.com> <94DD0D83-8FDE-4A61-AAF0-09A0175A0D0D@live.com> <590ED76A-EE91-4ED1-B524-BC23419C051E@live.com> <02125722-91FC-43D3-B63C-1B789C2DA8C3@live.com> <958B8D22-F11E-4B5D-9F44-6F0626DBCB63@live.com> In-Reply-To: <958B8D22-F11E-4B5D-9F44-6F0626DBCB63@live.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [j+6HjTJ2dHgpkG9sPJ7uzxmi9j7JMZcJ] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d81c4a98-0b5b-48a4-265e-08da2487080f x-ms-traffictypediagnostic: PN0PR01MB7952:EE_ x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: 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 Content-ID: MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-4755-11-msonline-outlook-42ed3.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PNZPR01MB4415.INDPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: d81c4a98-0b5b-48a4-265e-08da2487080f X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Apr 2022 17:39:20.0586 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PN0PR01MB7952 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Aditya Garg On Apple T2 Macs, when Linux attempts to read the db and dbx efi variables at early boot to load UEFI Secure Boot certificates, a page fault occurs in Apple firmware code and EFI runtime services are disabled with the following logs: [Firmware Bug]: Page fault caused by firmware at PA: 0xffffb1edc0068000 WARNING: CPU: 3 PID: 104 at arch/x86/platform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xf0 (Removed some logs from here) Call Trace: page_fault_oops+0x4f/0x2c0 ? search_bpf_extables+0x6b/0x80 ? search_module_extables+0x50/0x80 ? search_exception_tables+0x5b/0x60 kernelmode_fixup_or_oops+0x9e/0x110 __bad_area_nosemaphore+0x155/0x190 bad_area_nosemaphore+0x16/0x20 do_kern_addr_fault+0x8c/0xa0 exc_page_fault+0xd8/0x180 asm_exc_page_fault+0x1e/0x30 (Removed some logs from here) ? __efi_call+0x28/0x30 ? switch_mm+0x20/0x30 ? efi_call_rts+0x19a/0x8e0 ? process_one_work+0x222/0x3f0 ? worker_thread+0x4a/0x3d0 ? kthread+0x17a/0x1a0 ? process_one_work+0x3f0/0x3f0 ? set_kthread_struct+0x40/0x40 ? ret_from_fork+0x22/0x30 ---[ end trace 1f82023595a5927f ]--- efi: Froze efi_rts_wq and disabled EFI Runtime Services integrity: Couldn't get size: 0x8000000000000015 integrity: MODSIGN: Couldn't get UEFI db list efi: EFI Runtime Services are disabled! integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get UEFI dbx list integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get mokx list integrity: Couldn't get size: 0x80000000 So we avoid reading these UEFI variables and thus prevent the crash. Cc: stable@vger.kernel.org Signed-off-by: Aditya Garg Reviewed-by: Mimi Zohar --- v2 :- Reduce code size of the table. v3 :- Close the brackets which were left open by mistake. v4 :- Fix comment style issues, remove blank spaces and limit use of dmi_first_match() v4 RESEND :- Add stable to cc v5 :- Rewrite the description v6 :- Make description more clear v7 :- Minor changes and add reviewed by .../platform_certs/keyring_handler.h | 8 +++++ security/integrity/platform_certs/load_uefi.c | 33 +++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/security/integrity/platform_certs/keyring_handler.h b/security/integrity/platform_certs/keyring_handler.h index 284558f30..212d894a8 100644 --- a/security/integrity/platform_certs/keyring_handler.h +++ b/security/integrity/platform_certs/keyring_handler.h @@ -35,3 +35,11 @@ efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type); efi_element_handler_t get_handler_for_dbx(const efi_guid_t *sig_type); #endif + +#ifndef UEFI_QUIRK_SKIP_CERT +#define UEFI_QUIRK_SKIP_CERT(vendor, product) \ + .matches = { \ + DMI_MATCH(DMI_BOARD_VENDOR, vendor), \ + DMI_MATCH(DMI_PRODUCT_NAME, product), \ + }, +#endif diff --git a/security/integrity/platform_certs/load_uefi.c b/security/integrity/platform_certs/load_uefi.c index 5f45c3c07..1a7e7d597 100644 --- a/security/integrity/platform_certs/load_uefi.c +++ b/security/integrity/platform_certs/load_uefi.c @@ -3,6 +3,7 @@ #include #include #include +#include #include #include #include @@ -12,6 +13,31 @@ #include "../integrity.h" #include "keyring_handler.h" +/* + * On T2 Macs reading the db and dbx efi variables to load UEFI Secure Boot + * certificates causes occurrence of a page fault in Apple's firmware and + * a crash disabling EFI runtime services. The following quirk skips reading + * these variables. + */ +static const struct dmi_system_id uefi_skip_cert[] = { + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,3") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro15,4") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,3") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookPro16,4") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir8,2") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacBookAir9,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacMini8,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "MacPro7,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,1") }, + { UEFI_QUIRK_SKIP_CERT("Apple Inc.", "iMac20,2") }, + { } +}; + /* * Look to see if a UEFI variable called MokIgnoreDB exists and return true if * it does. @@ -138,6 +164,13 @@ static int __init load_uefi_certs(void) unsigned long dbsize = 0, dbxsize = 0, mokxsize = 0; efi_status_t status; int rc = 0; + const struct dmi_system_id *dmi_id; + + dmi_id = dmi_first_match(uefi_skip_cert); + if (dmi_id) { + pr_err("Reading UEFI Secure Boot Certs is not supported on T2 Macs.\n"); + return false; + } if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) return false;