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Wed, 13 May 2026 22:12:55 -0700 From: Kartik Rajput To: , , , , , CC: Kartik Rajput Subject: [PATCH RESEND] soc/tegra: fuse: Do not use fuse data as entropy source Date: Thu, 14 May 2026 10:42:52 +0530 Message-ID: <20260514051252.2401568-1-kkartik@nvidia.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CE4:EE_|IA1PR12MB9523:EE_ X-MS-Office365-Filtering-Correlation-Id: 4ae333db-60bd-4a0c-96a9-08deb1777e17 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|11063799003|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(36860700016)(376014)(11063799003)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 9DtVkD5UTF8u0QL2ETUrr8nTDAUsWkQUUPsv3F/6lHZBTmSbIcG04Km6576AtnOR3lUydlsTiFOxrx6TUs0LLJhnnNlOupnl18XZBPp9U0y8yTZJEhOLHxktrgeQEQYi0NEIGI2PUsn3OgZZT7WL7JA/DnpJOMtpNrGJZLsqFa2yEvpnDFaRkrUkGedJd2STCnn3OCtQDom9QwxbG04J+PoTSnMJfQzl5Mu7TB6CfzFZt5KRCYuSWQHu9bO2U+LJ8ReASXxmy4cyE4AOft45+HebVkoM5CXLoB2T1ZpC+4635Fzr9az2+35EV2FyfMdtBurSFqJH93Fpibajpug7gC1SGU2SjRjw2Hk3xXCRo5X6bxVCTq4BxY09P5N9eRwT/mljkTLgSBkLBIEIz6Nx+YdeCxv1uJR7LsrKNPuk8rIf6aVXzKxHgou8tSqf6cm1 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 May 2026 05:13:10.7124 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4ae333db-60bd-4a0c-96a9-08deb1777e17 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE4.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB9523 Fuse values are static and device-unique but not secret. Using them as an entropy source weakens the overall randomness pool because the data is constant and externally observable over the device=E2=80=99s lifetime. Stop feeding fuse data into the kernel=E2=80=99s randomness subsystem. Signed-off-by: Kartik Rajput --- drivers/soc/tegra/fuse/fuse-tegra30.c | 24 ------------------------ 1 file changed, 24 deletions(-) diff --git a/drivers/soc/tegra/fuse/fuse-tegra30.c b/drivers/soc/tegra/fuse= /fuse-tegra30.c index 524fa1b0cd3d..2fad8b13a3b9 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra30.c +++ b/drivers/soc/tegra/fuse/fuse-tegra30.c @@ -64,28 +64,6 @@ static u32 tegra30_fuse_read(struct tegra_fuse *fuse, un= signed int offset) return value; } =20 -static void __init tegra30_fuse_add_randomness(void) -{ - u32 randomness[12]; - - randomness[0] =3D tegra_sku_info.sku_id; - randomness[1] =3D tegra_read_straps(); - randomness[2] =3D tegra_read_chipid(); - randomness[3] =3D tegra_sku_info.cpu_process_id << 16; - randomness[3] |=3D tegra_sku_info.soc_process_id; - randomness[4] =3D tegra_sku_info.cpu_speedo_id << 16; - randomness[4] |=3D tegra_sku_info.soc_speedo_id; - randomness[5] =3D tegra_fuse_read_early(FUSE_VENDOR_CODE); - randomness[6] =3D tegra_fuse_read_early(FUSE_FAB_CODE); - randomness[7] =3D tegra_fuse_read_early(FUSE_LOT_CODE_0); - randomness[8] =3D tegra_fuse_read_early(FUSE_LOT_CODE_1); - randomness[9] =3D tegra_fuse_read_early(FUSE_WAFER_ID); - randomness[10] =3D tegra_fuse_read_early(FUSE_X_COORDINATE); - randomness[11] =3D tegra_fuse_read_early(FUSE_Y_COORDINATE); - - add_device_randomness(randomness, sizeof(randomness)); -} - static void __init tegra30_fuse_init(struct tegra_fuse *fuse) { fuse->read_early =3D tegra30_fuse_read_early; @@ -95,8 +73,6 @@ static void __init tegra30_fuse_init(struct tegra_fuse *f= use) =20 if (fuse->soc->speedo_init) fuse->soc->speedo_init(&tegra_sku_info); - - tegra30_fuse_add_randomness(); } #endif =20 --=20 2.43.0