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Mon, 16 Oct 2023 03:14:48 -0700 From: Kartik To: , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 1/8] mm/util: Introduce kmemdup_array() Date: Mon, 16 Oct 2023 15:44:29 +0530 Message-ID: <20231016101436.7146-2-kkartik@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231016101436.7146-1-kkartik@nvidia.com> References: <20231016101436.7146-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C9:EE_|MW4PR12MB8610:EE_ X-MS-Office365-Filtering-Correlation-Id: d45218c2-e495-45fb-af4e-08dbce30c7ec 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:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(396003)(376002)(136003)(346002)(39860400002)(230922051799003)(82310400011)(186009)(1800799009)(451199024)(64100799003)(46966006)(40470700004)(36840700001)(47076005)(36860700001)(26005)(40460700003)(82740400003)(2616005)(426003)(336012)(40480700001)(8936002)(7416002)(86362001)(2906002)(5660300002)(8676002)(6666004)(316002)(70586007)(70206006)(110136005)(36756003)(41300700001)(1076003)(921005)(356005)(7636003)(478600001)(83996005)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2023 10:15:10.9580 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d45218c2-e495-45fb-af4e-08dbce30c7ec 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: SA2PEPF000015C9.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB8610 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Introduce kmemdup_array() API to duplicate `n` number of elements from a given array. This internally uses kmemdup to allocate and duplicate the `src` array. Signed-off-by: Kartik --- v4 -> v5: * Simplify the implementation by just returning kmemdup(size_mul). --- include/linux/string.h | 1 + mm/util.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index 3c920b6d609b..fcfa1062c79b 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -180,6 +180,7 @@ extern char *kstrndup(const char *s, size_t len, gfp_t gfp); extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp); +extern void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp); extern char **argv_split(gfp_t gfp, const char *str, int *argcp); extern void argv_free(char **argv); diff --git a/mm/util.c b/mm/util.c index 6eddd891198e..8801446140d6 100644 --- a/mm/util.c +++ b/mm/util.c @@ -135,6 +135,23 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp) } EXPORT_SYMBOL(kmemdup); +/** + * kmemdup_array - duplicate a given array. + * + * @src: array to duplicate. + * @element_size: size of each element of array. + * @count: number of elements to duplicate from array. + * @gfp: GFP mask to use. + * + * Return: duplicated array of @src or %NULL in case of error, + * result is physically contiguous. Use kfree() to free. + */ +void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp) +{ + return kmemdup(src, size_mul(element_size, count), gfp); +} +EXPORT_SYMBOL(kmemdup_array); + /** * kvmemdup - duplicate region of memory *