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Peter Anvin" CC: , Brendan Jackman , Derek Manwaring Subject: [PATCH v4 34/36] x86/pti: Add attack vector controls for pti Date: Mon, 10 Mar 2025 11:40:21 -0500 Message-ID: <20250310164023.779191-35-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250310164023.779191-1-david.kaplan@amd.com> References: <20250310164023.779191-1-david.kaplan@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00022572:EE_|DM6PR12MB4220:EE_ X-MS-Office365-Filtering-Correlation-Id: f1e1272c-930e-4aa1-46b7-08dd5ff25d8a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?xyP6hxYPXCy6dE62clbQbyWXTc+FLKOmjqVAzDS9cSYy4vw/zT2AnX075+aL?= =?us-ascii?Q?PHY8FBeQztuWVFxLqYiP1jTrXJnXNOu9kNujJoFvSyil6fdT//M5qFIoNHOc?= =?us-ascii?Q?qnL1UrTaA4X8kwlAGSZlZQx+43TYpiKi364EDPjk9r8jrTT0TlKRn4Ew8SkO?= =?us-ascii?Q?7f5YgPOH0KoejJGlXdkZgpr2ArrFSY0ec+LZZFv9CoqHFZ6Z/7Ab7TCcQMo0?= =?us-ascii?Q?5Ktn2iQtfiz124qPaUyBGMcrWgWNexbkq2otdo7wFxOnZ/wNo2lmz9AWSFfH?= =?us-ascii?Q?Z7LOAVMJfu2uVe+FvYiLcSsjm+TxoJF8cCP/mzC3DhLAMGOdw29zDZp6fbPP?= =?us-ascii?Q?BFicBjb23cep/fP6Vy7ZWUzc5SmEgXM9cUWfY9ISmvf7uKAVQaSudPQm7Y4W?= =?us-ascii?Q?tiuOWor8U8TFIUa8j1eM2mSo93HPdOSGhOvUGb8t8rNTKRUce/KdoH9N52uw?= =?us-ascii?Q?2DA8/FcvUTjKxSANy+x4aZFrSlFslWWLiFcqrzqnch7bOYZwElJZ83Q0ZSKr?= =?us-ascii?Q?VtR9Amg1aexA5s6oAYSPEatd25k7ZVo/cNgNhxndsvH1ZLGBoMXUfbER5fwl?= =?us-ascii?Q?ZetXvfqpeIl4tzgJj+eHzp++8+zoQZXnuDl70CAi3emTyJHNq5pYmvkq4tpt?= =?us-ascii?Q?A6Xa7p8L2CHNIHUIiEiU6izYkItFYB48n/XqLDeqKLXWCpH0UqW7S6ajU9hS?= =?us-ascii?Q?tGor7h1p1vrIXj96o/aUgVIwm/m3QKOLvyEXjcgpscc8hvpTYlSqDXEpQN1T?= =?us-ascii?Q?xktjCHIknazJd7qAX4Si4dQJlOUw5M0AljisdKciuYIithXlRPvHhnwl+tIq?= =?us-ascii?Q?H4AVK0npp1qowm5Wng08cjiIVemc45RdjjqtG/BWR/yULFjHdcPB3j+KkeHx?= =?us-ascii?Q?8qNzDys4MvoUVZeFGWrENFtILgWP3rPJ4UalcAANCNYLCkweWMpGFs+O9nq0?= =?us-ascii?Q?lcrait8SWslL0TZxwmR/2i0gQzfs7hzV+FdoY4Ind2AjNtRGHKA64rjWFw/h?= =?us-ascii?Q?78u2J/x+qfNX9rM5g1adOKeF3qRDk9h7HQJ6GFh/RQ+jC7DY+sOe1qKd1+z+?= =?us-ascii?Q?ySml5odv3S2P3YwLFGF/qySeJTh/Km2yUkP1UFqDvVHuo/+KvpsWGHV2W058?= =?us-ascii?Q?EVz9yWPrRpJhJkbGyPOMVuqBj3KohdKcx+bYdEqAAbjs9MTSXbLDPj+ubjJg?= =?us-ascii?Q?b3S6mMxoiVeTxQQP1qDJhQHEmY1dMY8s8S8x8eh1ejYentKknc0/0sLkrOuF?= =?us-ascii?Q?0ILMeJ9P5gOnFYuWjTYeKCx7K0aLzMdDxCRty7cPA55ChgJlgQGZGKCP5hEA?= =?us-ascii?Q?iYSwkcwNmIJd6j7SO3hrx5nMcdrbkCHvZAXYfn7hS2ZBhJt2jBnr7TADPwIj?= =?us-ascii?Q?9pPP9Nsr2OOzKwZeQeIKzw3pSw2K6PMrnX5u6fjMY5vPUNjCYG+Vkx616fK6?= =?us-ascii?Q?Waf7DgUuR7ULsOgfVCe+vMadOoSmhhTBGw9i3M1EfkzASoVpsFkDf64bH+rq?= =?us-ascii?Q?whj1z5uHW1zC+nE=3D?= 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:(13230040)(1800799024)(36860700013)(82310400026)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2025 16:41:11.2077 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f1e1272c-930e-4aa1-46b7-08dd5ff25d8a 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: BL6PEPF00022572.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4220 Content-Type: text/plain; charset="utf-8" Disable PTI mitigation if user->kernel attack vector mitigations are disabled. Signed-off-by: David Kaplan --- arch/x86/mm/pti.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c index 5f0d579932c6..e5b96233aa58 100644 --- a/arch/x86/mm/pti.c +++ b/arch/x86/mm/pti.c @@ -38,6 +38,7 @@ #include #include #include +#include =20 #undef pr_fmt #define pr_fmt(fmt) "Kernel/User page tables isolation: " fmt @@ -84,7 +85,8 @@ void __init pti_check_boottime_disable(void) return; } =20 - if (cpu_mitigations_off()) + if (pti_mode =3D=3D PTI_AUTO && + !cpu_mitigate_attack_vector(CPU_MITIGATE_USER_KERNEL)) pti_mode =3D PTI_FORCE_OFF; if (pti_mode =3D=3D PTI_FORCE_OFF) { pti_print_if_insecure("disabled on command line."); --=20 2.34.1