From patchwork Mon Nov 29 11:42:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dov Murik X-Patchwork-Id: 518300 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 C1362C43219 for ; Mon, 29 Nov 2021 11:45:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243256AbhK2Lsw (ORCPT ); Mon, 29 Nov 2021 06:48:52 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:37480 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S244428AbhK2Lqr (ORCPT ); Mon, 29 Nov 2021 06:46:47 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1ATAm2rv013010; Mon, 29 Nov 2021 11:43:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=SP+6dubD5vvPT0ZMA56BBNLSDVelDCWwbi0gGrBqYK0=; b=VG9ZkZ973UwvVAG8zbzl6yn0VlEL95sHF2UIwED6XbWlxk96Y+XfPxAvJuSuKoMKoTj3 UwSKBKMlSCi1u1hUljDKNIvBkIW0X9Ts3i0zWV/nUH9piXn2Xy6WHVsw2djiwAD0Z2TF WceL17i5gx1fFMhyi4NMb8YbGkk0SyL8fMs3HQX/naBI7JlF6Vnpnnh4K8glU1JtKjXC Ej0ULFjIJL4mK01rvT10U5Guwkvpxt0dVWsyEBIFCcUFsr6yC5SEmnKpnGiTLi8eTRIi cxWc0/gPFhX2zoAJBXonVS+kwEJRfcZ4iR7unbPt3+8jW0h0N3ej1MFwRkLVC+ie/3VP 1Q== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cmwdv160j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Nov 2021 11:43:04 +0000 Received: from m0098414.ppops.net (m0098414.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1ATBaTfR010952; Mon, 29 Nov 2021 11:43:03 GMT Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com with ESMTP id 3cmwdv1603-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Nov 2021 11:43:03 +0000 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1ATBWao3019394; Mon, 29 Nov 2021 11:43:03 GMT Received: from b01cxnp23032.gho.pok.ibm.com (b01cxnp23032.gho.pok.ibm.com [9.57.198.27]) by ppma02wdc.us.ibm.com with ESMTP id 3ckcaa7dqe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Nov 2021 11:43:02 +0000 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp23032.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1ATBh05c65667392 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 29 Nov 2021 11:43:00 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 404C4124054; Mon, 29 Nov 2021 11:43:00 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E1A47124058; Mon, 29 Nov 2021 11:42:59 +0000 (GMT) Received: from amdrome3.watson.ibm.com (unknown [9.2.130.16]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 29 Nov 2021 11:42:59 +0000 (GMT) From: Dov Murik To: linux-efi@vger.kernel.org Cc: Dov Murik , Borislav Petkov , Ashish Kalra , Brijesh Singh , Tom Lendacky , Ard Biesheuvel , James Morris , "Serge E. Hallyn" , Andi Kleen , Greg KH , Andrew Scull , Dave Hansen , "Dr. David Alan Gilbert" , James Bottomley , Tobin Feldman-Fitzthum , Jim Cadden , Daniele Buono , linux-coco@lists.linux.dev, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 2/5] efi/libstub: Reserve confidential computing secret area Date: Mon, 29 Nov 2021 11:42:48 +0000 Message-Id: <20211129114251.3741721-3-dovmurik@linux.ibm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211129114251.3741721-1-dovmurik@linux.ibm.com> References: <20211129114251.3741721-1-dovmurik@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: KImGb9G4tKI5bAhCW9COTpBl197Z9n5f X-Proofpoint-ORIG-GUID: Dgscfk579ant8giX_mAK9fzxLgeDvGsp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-29_07,2021-11-28_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 spamscore=0 adultscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 clxscore=1015 impostorscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111290058 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Some older firmware declare the confidential computing secret area as EFI_BOOT_SERVICES_DATA region. Fix this up by treating this memory region as EFI_RESERVED_TYPE, as it should be. If that memory region is already EFI_RESERVED_TYPE then this has no effect on the E820 map. Signed-off-by: Dov Murik --- drivers/firmware/efi/libstub/x86-stub.c | 28 +++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index f14c4ff5839f..dabfa33ae2b3 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -24,6 +24,7 @@ const efi_system_table_t *efi_system_table; extern u32 image_offset; static efi_loaded_image_t *image = NULL; +static u64 efi_coco_secret_phys_addr = U64_MAX; static efi_status_t preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) @@ -443,6 +444,21 @@ static void add_e820ext(struct boot_params *params, params->hdr.setup_data = (unsigned long)e820ext; } +#ifdef CONFIG_EFI_COCO_SECRET +static void efi_set_coco_secret_phys_addr(void) +{ + struct linux_efi_coco_secret_area *secret_area = + get_efi_config_table(LINUX_EFI_COCO_SECRET_AREA_GUID); + + if (!secret_area || secret_area->size == 0 || secret_area->size >= SZ_4G) + return; + + efi_coco_secret_phys_addr = secret_area->base_pa; +} +#else +static void efi_set_coco_secret_phys_addr(void) {} +#endif + static efi_status_t setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) { @@ -494,6 +510,16 @@ setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_s e820_type = E820_TYPE_SOFT_RESERVED; else e820_type = E820_TYPE_RAM; +#ifdef CONFIG_EFI_COCO_SECRET + if (d->phys_addr == efi_coco_secret_phys_addr) + /* + * Fix a quirk in firmwares which don't mark + * the EFI confidential computing area as + * EFI_RESERVED_TYPE, but instead as + * EFI_BOOT_SERVICES_DATA. + */ + e820_type = E820_TYPE_RESERVED; +#endif break; case EFI_ACPI_MEMORY_NVS: @@ -793,6 +819,8 @@ unsigned long efi_main(efi_handle_t handle, efi_retrieve_tpm2_eventlog(); + efi_set_coco_secret_phys_addr(); + setup_graphics(boot_params); setup_efi_pci(boot_params);