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Mon, 7 Oct 2024 06:28:51 -0700 From: Yonatan Maman To: , , , , , , , , CC: Yonatan Maman , , , Gal Shalom Subject: [PATCH v2 2/2] nouveau/dmem: Fix memory leak in `migrate_to_ram` upon copy error Date: Mon, 7 Oct 2024 16:27:00 +0300 Message-ID: <20241007132700.982800-3-ymaman@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241007132700.982800-1-ymaman@nvidia.com> References: <20241007132700.982800-1-ymaman@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF00036F3C:EE_|MN2PR12MB4110:EE_ X-MS-Office365-Filtering-Correlation-Id: 1966feee-151b-4241-6129-08dce6d4050f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|7416014|82310400026; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Oct 2024 13:29:07.0710 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1966feee-151b-4241-6129-08dce6d4050f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF00036F3C.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4110 From: Yonatan Maman A copy push command might fail, causing `migrate_to_ram` to return a dirty HIGH_USER page to the user. This exposes a security vulnerability in the nouveau driver. To prevent memory leaks in `migrate_to_ram` upon a copy error, allocate a zero page for the destination page. Fixes: 5be73b690875 ("drm/nouveau/dmem: device memory helpers for SVM") Signed-off-by: Yonatan Maman Signed-off-by: Gal Shalom Reviewed-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_dmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c index 6fb65b01d778..097bd3af0719 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c @@ -193,7 +193,7 @@ static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf) if (!spage || !(src & MIGRATE_PFN_MIGRATE)) goto done; - dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address); + dpage = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vmf->vma, vmf->address); if (!dpage) goto done; -- 2.34.1