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Tsirkin" , Lin Ma , "Jason Wang" , Xuan Zhuo , "Parav Pandit" CC: , , Subject: [PATCH 3/4] vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check Date: Thu, 27 Jul 2023 20:57:52 +0300 Message-ID: <20230727175757.73988-7-dtatulea@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230727175757.73988-1-dtatulea@nvidia.com> References: <20230727175757.73988-1-dtatulea@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT101:EE_|LV3PR12MB9260:EE_ X-MS-Office365-Filtering-Correlation-Id: eed779e9-cd5a-4f53-5ffe-08db8ecb1dab X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(396003)(39860400002)(346002)(136003)(376002)(82310400008)(451199021)(46966006)(36840700001)(40470700004)(86362001)(7636003)(356005)(36756003)(40460700003)(40480700001)(2906002)(110136005)(478600001)(54906003)(82740400003)(36860700001)(336012)(26005)(1076003)(186003)(426003)(2616005)(47076005)(41300700001)(6636002)(6666004)(316002)(8676002)(83380400001)(4326008)(70206006)(70586007)(5660300002)(8936002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2023 17:58:42.8926 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eed779e9-cd5a-4f53-5ffe-08db8ecb1dab 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: DM6NAM11FT101.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9260 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Lin Ma The vdpa_nl_policy structure is used to validate the nlattr when parsing the incoming nlmsg. It will ensure the attribute being described produces a valid nlattr pointer in info->attrs before entering into each handler in vdpa_nl_ops. That is to say, the missing part in vdpa_nl_policy may lead to illegal nlattr after parsing, which could lead to OOB read just like CVE-2023-3773. This patch adds the missing nla_policy for vdpa max vqp attr to avoid such bugs. Fixes: ad69dd0bf26b ("vdpa: Introduce query of device config layout") Signed-off-by: Lin Ma Cc: stable@vger.kernel.org --- drivers/vdpa/vdpa.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 75f1df2b9d2a..f2f654fd84e5 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -1247,6 +1247,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_AT= TR_MAX + 1] =3D { [VDPA_ATTR_MGMTDEV_DEV_NAME] =3D { .type =3D NLA_STRING }, [VDPA_ATTR_DEV_NAME] =3D { .type =3D NLA_STRING }, [VDPA_ATTR_DEV_NET_CFG_MACADDR] =3D NLA_POLICY_ETH_ADDR, + [VDPA_ATTR_DEV_NET_CFG_MAX_VQP] =3D { .type =3D NLA_U16 }, /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ [VDPA_ATTR_DEV_NET_CFG_MTU] =3D NLA_POLICY_MIN(NLA_U16, 68), [VDPA_ATTR_DEV_QUEUE_INDEX] =3D { .type =3D NLA_U32 }, --=20 2.41.0