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Tsirkin" , Lin Ma , "Jason Wang" , Xuan Zhuo , "Parav Pandit" CC: , , Subject: [PATCH 2/4] vdpa: Add queue index attr to vdpa_nl_policy for nlattr length check Date: Thu, 27 Jul 2023 20:57:50 +0300 Message-ID: <20230727175757.73988-5-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: DM6NAM11FT042:EE_|SJ1PR12MB6027:EE_ X-MS-Office365-Filtering-Correlation-Id: d9616b4d-734c-4920-5bfb-08db8ecb17d4 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)(39860400002)(346002)(376002)(396003)(136003)(451199021)(82310400008)(46966006)(36840700001)(40470700004)(47076005)(478600001)(110136005)(54906003)(86362001)(70586007)(6636002)(4326008)(1076003)(316002)(70206006)(356005)(7636003)(40480700001)(186003)(6666004)(8676002)(336012)(26005)(82740400003)(40460700003)(8936002)(2906002)(426003)(41300700001)(5660300002)(2616005)(36756003)(83380400001)(36860700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2023 17:58:33.0949 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d9616b4d-734c-4920-5bfb-08db8ecb17d4 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: DM6NAM11FT042.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6027 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 queue index attr to avoid such bugs. Fixes: 13b00b135665 ("vdpa: Add support for querying vendor statistics") Signed-off-by: Lin Ma Cc: stable@vger.kernelorg --- drivers/vdpa/vdpa.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 3ad355a2208a..75f1df2b9d2a 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -1249,6 +1249,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_AT= TR_MAX + 1] =3D { [VDPA_ATTR_DEV_NET_CFG_MACADDR] =3D NLA_POLICY_ETH_ADDR, /* 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 }, [VDPA_ATTR_DEV_FEATURES] =3D { .type =3D NLA_U64 }, }; =20 --=20 2.41.0