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Peter Anvin" , Ard Biesheuvel , Darren Hart , Andy Shevchenko , Matt Fleming , Subject: [PATCH] x86/sme: Explicitly map new EFI memmap table as encrypted Date: Wed, 20 Oct 2021 13:02:11 -0500 Message-ID: X-Mailer: git-send-email 2.33.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0fd01d4b-661e-4d11-8636-08d993f3c5b2 X-MS-TrafficTypeDiagnostic: BL1PR12MB5093: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(4636009)(46966006)(36840700001)(7696005)(2906002)(186003)(54906003)(110136005)(356005)(16526019)(6666004)(316002)(336012)(86362001)(2616005)(508600001)(426003)(5660300002)(83380400001)(47076005)(36756003)(70586007)(8936002)(7416002)(8676002)(36860700001)(81166007)(82310400003)(4326008)(26005)(70206006)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2021 18:02:25.2343 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0fd01d4b-661e-4d11-8636-08d993f3c5b2 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT014.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5093 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Reserving memory using efi_mem_reserve() calls into the x86 efi_arch_mem_reserve() function. This function will insert a new EFI memory descriptor into the EFI memory map representing the area of memory to be reserved and marking it as EFI runtime memory. As part of adding this new entry, a new EFI memory map is allocated and mapped. The mapping is where a problem can occur. This new memory map is mapped using early_memremap() and generally mapped encrypted, unless the new memory for the mapping happens to come from an area of memory that is marked as EFI_BOOT_SERVICES_DATA memory. In this case, the new memory will be mapped unencrypted. However, during replacement of the old memory map, efi_mem_type() is disabled, so the new memory map will now be long-term mapped encrypted (in efi.memmap), resulting in the map containing invalid data and causing the kernel boot to crash. Since it is known that the area will be mapped encrypted going forward, explicitly map the new memory map as encrypted using early_memremap_prot(). Cc: # 4.14.x Fixes: 8f716c9b5feb ("x86/mm: Add support to access boot related data in the clear") Signed-off-by: Tom Lendacky --- arch/x86/platform/efi/quirks.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index b15ebfe40a73..b0b848d6933a 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -277,7 +277,8 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size) return; } - new = early_memremap(data.phys_map, data.size); + new = early_memremap_prot(data.phys_map, data.size, + pgprot_val(pgprot_encrypted(FIXMAP_PAGE_NORMAL))); if (!new) { pr_err("Failed to map new boot services memmap\n"); return; -- 2.33.1