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Peter Anvin" CC: Subject: [PATCH v5 08/20] x86/bugs: Add attack vector controls for RFDS Date: Fri, 9 May 2025 11:28:27 -0500 Message-ID: <20250509162839.3057217-9-david.kaplan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250509162839.3057217-1-david.kaplan@amd.com> References: <20250509162839.3057217-1-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: BN3PEPF0000B074:EE_|MW6PR12MB9017:EE_ X-MS-Office365-Filtering-Correlation-Id: 348d04da-fb93-4dc6-ceae-08dd8f1698bd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|82310400026|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?TkruyHYllgM2HqGxWadKKfZ+UrEj4KLEuIcW1Y7/jjyfww9sYac2jkzueKVB?= =?us-ascii?Q?c1PQhsUIPlnYHSOSUieiaQD7rEl3lq94nqVbR4gohA+GT+9eVZRbU60v4AeB?= =?us-ascii?Q?jng+Jbe+EAGZ4SL4srB8rletz+7z1BQHnFEF0GihP5Nfv97uVlEh5u+NY091?= =?us-ascii?Q?kO/YS29orghUk/ff85AhtodjSenEVJutJodZsDoHWrNclF+x8WrgragrRmTC?= =?us-ascii?Q?7+vKPRz9fttjenzZx3r0I9MtVdzXhskuIOT56RZ9PhVKKI2qBnIgm61PXn0M?= =?us-ascii?Q?DfiN8Z1zck3pmSoyBYWhAzVSgrMiHuOaPS7Z8WsIrvhmU7dWaePqwbxR5b2F?= =?us-ascii?Q?AjHe5bB91FMJTjqKSOED936iKG8EnWPFjmfXDWp77MrxZON38Zu3ymKLjQVB?= =?us-ascii?Q?9eZjmF4ggpjgN5CIxoNHA+c8sfhoCp4l+T0BciLfOpVdRos4riwvE/rkYVqQ?= =?us-ascii?Q?N/S1wsI7jvWO9NvqGLwXpf6dyc/MN7jC6VcB1IOc1fhnwB9lQw2QIDyqBP/5?= =?us-ascii?Q?KHOrRiRrCtRRapBKqsC89ARAh+jUIICdKF8ANMQFGLbqUfLK/ldt0rLiwnI/?= =?us-ascii?Q?mXU8QLsvAALT+VqvIu9UNlWtfAg+xp9bWkPg4/59MyZYaMjjWLwNbPZ23bAM?= =?us-ascii?Q?T0ApM2ebm57bGhvdvKEZ47HHk2Hs6nfVltm6oA31yvBlb1YB9JHWnu889t/W?= =?us-ascii?Q?3182W1A2PO+WfIqDKgtfW3Cw3yrt/nlsY+BHEKpIpr9btztC51umv/oC/V1x?= =?us-ascii?Q?XCbWmHn2eZfNXztutUqNn25zUHAZCsWU3Xh/CAADRseT69xn+t/fOr5fTjah?= =?us-ascii?Q?9/CPzSGc4+EZs4g+k/8bD3d8ZM6z5QfF+VQ/h3i4GwUL1Lf7az2TIpyF15zS?= =?us-ascii?Q?yJ0r32PoESMfhoJxnD0HOaPjYxZF+6RKwYPF3CB6xoFM2FqJI2EaWH7qmcpx?= =?us-ascii?Q?//Slph9hWnME8vQ1ZD9JthaG5jLZCBSO7TKf0yJMzSkgBEqe8rrpxuIQJsEe?= =?us-ascii?Q?yx/pREiMXWhOWm0qNf8htrP7v52QxayftJ3ji4ortcYaaVYMGdLS0e1Ku2dq?= =?us-ascii?Q?HMDwkpJLip7tjX2y8XUAq2TYkZHkKFe5eJR0sTKphgMgSR3jTPRqHceBfSp9?= =?us-ascii?Q?KHp83FTiq1hkTihOJpSkRmzQwCdPp2WAJ/BDZb5capk8+IHm54tvWz7Bla+b?= =?us-ascii?Q?EIFK2sKJubpFy8aJcMYvPWmzJk3D7NOr0bS4wzNBt5z5ZPngglQhUKLkvrw7?= =?us-ascii?Q?MVMQ/6h6TXqQsCqd5JhvOUb1nBzojuEWaxAV1xo3o0nIX0CUmY2xe8gzfjX3?= =?us-ascii?Q?Y9RdTtcvn147bjnaosmidipxWWormSJpR1nlcMZ7l+I7cuqiNyT3278RrSzV?= =?us-ascii?Q?A+DF2t1wVbaRn9vHsiSd+3OYg1s1E8aNw4BpKyKUavp7JM4vVdtrMtJqVM0Q?= =?us-ascii?Q?NPzuhv80u3FQZpjr8YAvFZYe8RlFfnAatip/8TK7QuqBEPYWGIE23obTBjKN?= =?us-ascii?Q?do70bYYvNJBuLdabRejY1bqlEy8KURy3zxX0?= 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)(7416014)(376014)(1800799024)(82310400026)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2025 16:28:57.0641 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 348d04da-fb93-4dc6-ceae-08dd8f1698bd 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: BN3PEPF0000B074.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB9017 Content-Type: text/plain; charset="utf-8" Use attack vector controls to determine if RFDS mitigation is required. Signed-off-by: David Kaplan --- arch/x86/kernel/cpu/bugs.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index bb5d58abaab6..e807176bc845 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -726,13 +726,17 @@ static inline bool __init verw_clears_cpu_reg_file(vo= id) =20 static void __init rfds_select_mitigation(void) { - if (!boot_cpu_has_bug(X86_BUG_RFDS) || cpu_mitigations_off()) { + if (!boot_cpu_has_bug(X86_BUG_RFDS)) { rfds_mitigation =3D RFDS_MITIGATION_OFF; return; } =20 - if (rfds_mitigation =3D=3D RFDS_MITIGATION_AUTO) - rfds_mitigation =3D RFDS_MITIGATION_VERW; + if (rfds_mitigation =3D=3D RFDS_MITIGATION_AUTO) { + if (should_mitigate_vuln(X86_BUG_RFDS)) + rfds_mitigation =3D RFDS_MITIGATION_VERW; + else + rfds_mitigation =3D RFDS_MITIGATION_OFF; + } =20 if (rfds_mitigation =3D=3D RFDS_MITIGATION_OFF) return; @@ -743,7 +747,7 @@ static void __init rfds_select_mitigation(void) =20 static void __init rfds_update_mitigation(void) { - if (!boot_cpu_has_bug(X86_BUG_RFDS) || cpu_mitigations_off()) + if (!boot_cpu_has_bug(X86_BUG_RFDS)) return; =20 if (verw_clear_cpu_buf_mitigation_selected) --=20 2.34.1