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Tue, 24 Mar 2026 04:42:06 -0700 From: Kartik Rajput To: , , , , , Subject: [PATCH] soc/tegra: fuse: Do not use fuse data as entropy source Date: Tue, 24 Mar 2026 17:12:03 +0530 Message-ID: <20260324114204.551879-1-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: CO1PEPF000066E7:EE_|MN2PR12MB4159:EE_ X-MS-Office365-Filtering-Correlation-Id: 8a13236a-8bba-424a-38b8-08de899a6ba6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|18002099003|56012099003; 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)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: W2XyVKkiwY+Olu5XHim2wsGFV63eYqMZw5CQpLfGNwq6zlkUjPtDRuJTOgo0BhqkPif9OAKQx6z7lHrYTi7Xn3S0zz3jsuACIdL2cUG8jfkkoq1kkXKIiYRw1+nsGo3zZvO7a4v5PvGojXpf64OmzSaG3ar1eW4+8YPpNUtFUA3fNgCKhjRnpFwWABKrKkfDRSPIyz7BftICk0rbfDOwr9SVIYv0WV3xk2aQd0vPlaFkORhg/1b8DrbXId+AcmnHcdfNiO6JJPZ4/d/FIRo4P2N056HBw9J/zP79+5DVAz3CmS2Dvr4EdcFk/xdIXfVTbL8p86j30VSH+l0CU7UWr+A1597lrzo9elM6lV2Kt/CEoQoF31SJg5fbp/hrdjuY25ocR5A7ltc9IwtXz0NSIVD3TESPU3mOqFYCLerZ5WD2G/Zq1cs6g+PDiORfBpdb X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2026 11:42:25.6258 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a13236a-8bba-424a-38b8-08de899a6ba6 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: CO1PEPF000066E7.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4159 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