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Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Kees Cook , "Gustavo A. R. Silva" , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Jason Gunthorpe , Leon Romanovsky , Shradha Gupta , Konstantin Taranov Cc: Erick Archer , linux-rdma@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v3 1/3] net: mana: Add flex array to struct mana_cfg_rx_steer_req_v2 Date: Sat, 6 Apr 2024 16:23:35 +0200 Message-ID: X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240406142337.16241-1-erick.archer@outlook.com> References: <20240406142337.16241-1-erick.archer@outlook.com> X-TMN: [cTg0LrlH6ACousoX0jF5CgRxh1dEokR/] X-ClientProxiedBy: MA3P292CA0012.ESPP292.PROD.OUTLOOK.COM (2603:10a6:250:2c::16) To AS8PR02MB7237.eurprd02.prod.outlook.com (2603:10a6:20b:3f1::10) X-Microsoft-Original-Message-ID: <20240406142337.16241-2-erick.archer@outlook.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR02MB7237:EE_|AM9PR02MB7266:EE_ X-MS-Office365-Filtering-Correlation-Id: 3f12e0ca-08f7-4b5f-25c6-08dc564acd3e X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3f12e0ca-08f7-4b5f-25c6-08dc564acd3e X-MS-Exchange-CrossTenant-AuthSource: AS8PR02MB7237.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2024 15:04:06.9211 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR02MB7266 X-Patchwork-Delegate: kuba@kernel.org The "struct mana_cfg_rx_steer_req_v2" uses a dynamically sized set of trailing elements. Specifically, it uses a "mana_handle_t" array. So, use the preferred way in the kernel declaring a flexible array [1]. At the same time, prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). This is a previous step to refactor the two consumers of this structure. drivers/infiniband/hw/mana/qp.c drivers/net/ethernet/microsoft/mana/mana_en.c The ultimate goal is to avoid the open-coded arithmetic in the memory allocator functions [2] using the "struct_size" macro. 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Silva" , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Jason Gunthorpe , Leon Romanovsky , Shradha Gupta , Konstantin Taranov Cc: Erick Archer , linux-rdma@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v3 2/3] RDMA/mana_ib: Prefer struct_size over open coded arithmetic Date: Sat, 6 Apr 2024 16:23:36 +0200 Message-ID: X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240406142337.16241-1-erick.archer@outlook.com> References: <20240406142337.16241-1-erick.archer@outlook.com> X-TMN: [zNZV2QuriLTH4cBB6X+2iUPSwKagj/JV] X-ClientProxiedBy: MA2P292CA0029.ESPP292.PROD.OUTLOOK.COM (2603:10a6:250::19) To AS8PR02MB7237.eurprd02.prod.outlook.com (2603:10a6:20b:3f1::10) X-Microsoft-Original-Message-ID: <20240406142337.16241-3-erick.archer@outlook.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR02MB7237:EE_|DB9PR02MB9777:EE_ X-MS-Office365-Filtering-Correlation-Id: 1de0c22b-33d4-40e4-d44a-08dc5650692c X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1de0c22b-33d4-40e4-d44a-08dc5650692c X-MS-Exchange-CrossTenant-AuthSource: AS8PR02MB7237.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2024 15:44:14.7499 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR02MB9777 This is an effort to get rid of all multiplications from allocation functions in order to prevent integer overflows [1][2]. As the "req" variable is a pointer to "struct mana_cfg_rx_steer_req_v2" and this structure ends in a flexible array: struct mana_cfg_rx_steer_req_v2 { [...] mana_handle_t indir_tab[] __counted_by(num_indir_entries); }; the preferred way in the kernel is to use the struct_size() helper to do the arithmetic instead of the calculation "size + size * count" in the kzalloc() function. Moreover, use the "offsetof" helper to get the indirect table offset instead of the "sizeof" operator and avoid the open-coded arithmetic in pointers using the new flex member. This new structure member also allow us to remove the "req_indir_tab" variable since it is no longer needed. This way, the code is more readable and safer. This code was detected with the help of Coccinelle, and audited and modified manually. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1] Link: https://github.com/KSPP/linux/issues/160 [2] Signed-off-by: Erick Archer Reviewed-by: Long Li Reviewed-by: Justin Stitt --- drivers/infiniband/hw/mana/qp.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/infiniband/hw/mana/qp.c b/drivers/infiniband/hw/mana/qp.c index ef0a6dc664d0..4cd8f8afe80d 100644 --- a/drivers/infiniband/hw/mana/qp.c +++ b/drivers/infiniband/hw/mana/qp.c @@ -15,15 +15,13 @@ static int mana_ib_cfg_vport_steering(struct mana_ib_dev *dev, struct mana_port_context *mpc = netdev_priv(ndev); struct mana_cfg_rx_steer_req_v2 *req; struct mana_cfg_rx_steer_resp resp = {}; - mana_handle_t *req_indir_tab; struct gdma_context *gc; u32 req_buf_size; int i, err; gc = mdev_to_gc(dev); - req_buf_size = - sizeof(*req) + sizeof(mana_handle_t) * MANA_INDIRECT_TABLE_SIZE; + req_buf_size = struct_size(req, indir_tab, MANA_INDIRECT_TABLE_SIZE); req = kzalloc(req_buf_size, GFP_KERNEL); if (!req) return -ENOMEM; @@ -44,20 +42,20 @@ static int mana_ib_cfg_vport_steering(struct mana_ib_dev *dev, req->rss_enable = true; req->num_indir_entries = MANA_INDIRECT_TABLE_SIZE; - req->indir_tab_offset = sizeof(*req); + req->indir_tab_offset = offsetof(struct mana_cfg_rx_steer_req_v2, + indir_tab); req->update_indir_tab = true; req->cqe_coalescing_enable = 1; - req_indir_tab = (mana_handle_t *)(req + 1); /* The ind table passed to the hardware must have * MANA_INDIRECT_TABLE_SIZE entries. 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Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Kees Cook , "Gustavo A. R. Silva" , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Jason Gunthorpe , Leon Romanovsky , Shradha Gupta , Konstantin Taranov Cc: Erick Archer , linux-rdma@vger.kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v3 3/3] net: mana: Avoid open coded arithmetic Date: Sat, 6 Apr 2024 16:23:37 +0200 Message-ID: X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240406142337.16241-1-erick.archer@outlook.com> References: <20240406142337.16241-1-erick.archer@outlook.com> X-TMN: [IjmoCuAyloIqhvoUYW9pNGyBpZ9aP3ZY] X-ClientProxiedBy: MA4P292CA0011.ESPP292.PROD.OUTLOOK.COM (2603:10a6:250:2d::17) To AS8PR02MB7237.eurprd02.prod.outlook.com (2603:10a6:20b:3f1::10) X-Microsoft-Original-Message-ID: <20240406142337.16241-4-erick.archer@outlook.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR02MB7237:EE_|DU0PR02MB9121:EE_ X-MS-Office365-Filtering-Correlation-Id: a83463e9-01d5-437c-88e7-08dc5656044e X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a83463e9-01d5-437c-88e7-08dc5656044e X-MS-Exchange-CrossTenant-AuthSource: AS8PR02MB7237.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2024 16:24:22.1362 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR02MB9121 X-Patchwork-Delegate: kuba@kernel.org This is an effort to get rid of all multiplications from allocation functions in order to prevent integer overflows [1][2]. As the "req" variable is a pointer to "struct mana_cfg_rx_steer_req_v2" and this structure ends in a flexible array: struct mana_cfg_rx_steer_req_v2 { [...] mana_handle_t indir_tab[] __counted_by(num_indir_entries); }; the preferred way in the kernel is to use the struct_size() helper to do the arithmetic instead of the calculation "size + size * count" in the kzalloc() function. Moreover, use the "offsetof" helper to get the indirect table offset instead of the "sizeof" operator and avoid the open-coded arithmetic in pointers using the new flex member. This new structure member also allow us to remove the "req_indir_tab" variable since it is no longer needed. Now, it is also possible to use the "flex_array_size" helper to compute the size of these trailing elements in the "memcpy" function. This way, the code is more readable and safer. This code was detected with the help of Coccinelle, and audited and modified manually. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1] Link: https://github.com/KSPP/linux/issues/160 [2] Signed-off-by: Erick Archer Reviewed-by: Justin Stitt --- drivers/net/ethernet/microsoft/mana/mana_en.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index d8af5e7e15b4..f2fae659bf3b 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1058,11 +1058,10 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc, struct mana_cfg_rx_steer_req_v2 *req; struct mana_cfg_rx_steer_resp resp = {}; struct net_device *ndev = apc->ndev; - mana_handle_t *req_indir_tab; u32 req_buf_size; int err; - req_buf_size = sizeof(*req) + sizeof(mana_handle_t) * num_entries; + req_buf_size = struct_size(req, indir_tab, num_entries); req = kzalloc(req_buf_size, GFP_KERNEL); if (!req) return -ENOMEM; @@ -1074,7 +1073,8 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc, req->vport = apc->port_handle; req->num_indir_entries = num_entries; - req->indir_tab_offset = sizeof(*req); + req->indir_tab_offset = offsetof(struct mana_cfg_rx_steer_req_v2, + indir_tab); req->rx_enable = rx; req->rss_enable = apc->rss_state; req->update_default_rxobj = update_default_rxobj; @@ -1086,11 +1086,9 @@ static int mana_cfg_vport_steering(struct mana_port_context *apc, if (update_key) memcpy(&req->hashkey, apc->hashkey, MANA_HASH_KEY_SIZE); - if (update_tab) { - req_indir_tab = (mana_handle_t *)(req + 1); - memcpy(req_indir_tab, apc->rxobj_table, - req->num_indir_entries * sizeof(mana_handle_t)); - } + if (update_tab) + memcpy(req->indir_tab, apc->rxobj_table, + flex_array_size(req, indir_tab, req->num_indir_entries)); err = mana_send_request(apc->ac, req, req_buf_size, &resp, sizeof(resp));