From patchwork Tue Oct 17 19:04:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Keller X-Patchwork-Id: 13425785 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7D862DF92; Tue, 17 Oct 2023 19:04:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="D4gzw87x" Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62943F5; Tue, 17 Oct 2023 12:04:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697569471; x=1729105471; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=d7FDOP7CsaCZrBn6l9ubPcTsZCF3dmd9cR8EUzjjCc8=; b=D4gzw87xx0TqhsitHjxYs9UbvM0cYfhbd/6fsgyqNzXILBmc7kEFvPMX LcwyM8/3RfE8/BTh1Xx4LptrIvApa6XuM72OMkXRY6rc9XbcmzrdLK2sr yFyfaI478jHhTFAwWXjF2gkyyUvu46OMHm1sHgwknH5Nv0K0NU1qM4hO4 AGlZXMmzgYxZxyKItjRJwKxOFQD1QY819hV+5GeWWRKLTTNzlxI/332cf /hry4qjSXKV42P/aee9x5KJr7ENF3Yt4K470/QAB/XamSZ/aNTUi/2ATU MBMmG5alqIre4zApuc25F8hzHUGd+AiCRPOHiT5MU0ApQ6Xo5l9UeW+5u g==; X-IronPort-AV: E=McAfee;i="6600,9927,10866"; a="384739821" X-IronPort-AV: E=Sophos;i="6.03,233,1694761200"; d="scan'208";a="384739821" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 12:04:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10866"; a="822108794" X-IronPort-AV: E=Sophos;i="6.03,233,1694761200"; d="scan'208";a="822108794" Received: from jekeller-desk.amr.corp.intel.com (HELO jekeller-desk.jekeller.internal) ([10.166.241.1]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 12:04:20 -0700 From: Jacob Keller To: netdev@vger.kernel.org, David Miller , Jakub Kicinski Cc: Justin Stitt , linux-hardening@vger.kernel.org, Pucha Himasekhar Reddy , Jacob Keller Subject: [PATCH net-next 9/9] igc: replace deprecated strncpy with strscpy Date: Tue, 17 Oct 2023 12:04:11 -0700 Message-ID: <20231017190411.2199743-10-jacob.e.keller@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231017190411.2199743-1-jacob.e.keller@intel.com> References: <20231017190411.2199743-1-jacob.e.keller@intel.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net From: Justin Stitt `strncpy` is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We expect netdev->name to be NUL-terminated based on its use with format strings: | if (q_vector->rx.ring && q_vector->tx.ring) | sprintf(q_vector->name, "%s-TxRx-%u", netdev->name, Furthermore, we do not need NUL-padding as netdev is already zero-allocated: | netdev = alloc_etherdev_mq(sizeof(struct igc_adapter), | IGC_MAX_TX_QUEUES); ... alloc_etherdev() -> alloc_etherdev_mq() -> alloc_etherdev_mqs() -> alloc_netdev_mqs() ... | p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Tested-by: Pucha Himasekhar Reddy (A Contingent worker at Intel) Signed-off-by: Jacob Keller --- drivers/net/ethernet/intel/igc/igc_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 98de34d0ce07..e9bb403bbacf 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -6935,7 +6935,7 @@ static int igc_probe(struct pci_dev *pdev, */ igc_get_hw_control(adapter); - strncpy(netdev->name, "eth%d", IFNAMSIZ); + strscpy(netdev->name, "eth%d", sizeof(netdev->name)); err = register_netdev(netdev); if (err) goto err_register;