From patchwork Thu Sep 21 09:58:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 13394510 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A8925E7D0A2 for ; Thu, 21 Sep 2023 20:20:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231599AbjIUUUy (ORCPT ); Thu, 21 Sep 2023 16:20:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232014AbjIUUUN (ORCPT ); Thu, 21 Sep 2023 16:20:13 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1A58561F3 for ; Thu, 21 Sep 2023 10:17:51 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id d9443c01a7336-1c43334badcso9545435ad.0 for ; Thu, 21 Sep 2023 10:17:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1695316671; x=1695921471; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=UvRP2TfqMYoWryE4cjFQULg+pydcORb0OjXIUY1wqrk=; b=j0GTqRLAj0g+P6ljPeN/a+9fYPbyHViMS1gpq8aW00pSsyOllQHcEDX8hvELgMBD4T wB8vuBwHuTIyXjW+YPElrJ0G2v1AD46xqB58IK3ZF/A8Cub9VmmYcuDEdXcMnlI1vSCv CKbJp2G/RK9dND8nnJTRPIwdOXbvSGCB/EjXVgqehy1Tx3QPtAsYemrBOdqYwOW9iz0m GR35m1lHcWp8mUHCV2uBgUsaKEnxwWMOocKed/SmDRCsMSEnmyugF6nRRwhzrYs0N6z0 yzS3sSjQ49qrXQpWx8aSc2hRdRVwxt9KjJZfiC7651XceOzwgySdf63U65al7/JlXWtC S+xA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695316671; x=1695921471; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=UvRP2TfqMYoWryE4cjFQULg+pydcORb0OjXIUY1wqrk=; b=jVK5H9EjZJ5swTapDhvSUCXMhC3gASuEYgBo6UyUiHmf9sQRbddc9XM+89IAxhT52r +BqV89hHezbXqHrEOVZ4cGYB51ijL71MCORoDClWlSCZ4+9lxyK06EuIZkYl53mYl55b hhOXgklho3JnYP/LjS1MUZferd1EkWuK8Zuh7VAVsU9O5cW1Wo9VJsiAFN7Up4whcJ43 U5xs7hBtsiGicdB1h4rRsfaXawMYuDOUB7bKAej9oepy5hIOasbEWJnG9Ts16EFVhJKG 9qUyNXJ3a0KRMtSo+sqh2rBsVz+/LPioIAJyX2ipmDxZfukVQYAzas23lK8mQPUjL8NP m08A== X-Gm-Message-State: AOJu0YwD/FGo9xxErBgxh7CQEJcYsmPH5rqJGAXxDkRXwx+7MYTr8NYp GzSbByzsc4W6Aa+arbOYoobV3jfBIXjWn9PCVw== X-Google-Smtp-Source: AGHT+IG2Yj4B6f5Tc0Rfcf05CQVFSDA0RjwtjZ26D7TwaHMo12AIN3tJQTbDdw8rZkT3SSBitMany2q06U1RnGKdFA== X-Received: from jstitt-linux1.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:23b5]) (user=justinstitt job=sendgmr) by 2002:a05:6902:1704:b0:d64:f7ec:6d5d with SMTP id by4-20020a056902170400b00d64f7ec6d5dmr74413ybb.10.1695290292498; Thu, 21 Sep 2023 02:58:12 -0700 (PDT) Date: Thu, 21 Sep 2023 09:58:11 +0000 Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIALITDGUC/x2NywqDMBAAf0X23AXzqKC/IkVCXOsejGFXpUX89 8ZeBuYyc4KSMCl01QlCByuvqYh5VBDnkN6EPBYHW1tXt9agbpJi/uIofJAocsr7hrKwvzFMzmN EH5rWP51pIgUoqSw08ee/6V/X9QNQGac9dgAAAA== X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1695290291; l=1427; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=j36xxcAKXhVsbdky0Obg3UV1f7PgSu4ObXF+TdHlQCQ=; b=Pb35PYt7fwpSsE9B2qcuVWUq286nCf7oXfw7i0nvTKQhWQ6J+VwYyKR6k0TFykxTVFMxIx2xi 11/P/koHLdmCZR549wEcVOW/DbyUc2TtEX9Y9vD/emSCyTPjYvAmZp9 X-Mailer: b4 0.12.3 Message-ID: <20230921-strncpy-drivers-input-rmi4-rmi_f34-c-v1-1-4aef2e84b8d2@google.com> Subject: [PATCH] Input: synaptics-rmi4 - replace deprecated strncpy From: Justin Stitt To: Dmitry Torokhov Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org `strncpy` is deprecated for use on NUL-terminated destination strings [1] Let's use memcpy() as the bounds have already been checked and this decays into a simple byte copy from one buffer to another removing any ambiguity that strncpy has. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- Note: build-tested only. Similar to Kees' suggestion here [2] [2]: https://lore.kernel.org/all/202309142045.7CBAE940E@keescook/ --- drivers/input/rmi4/rmi_f34.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 2cf0f715623872823a72e451243bbf555d10d032 change-id: 20230921-strncpy-drivers-input-rmi4-rmi_f34-c-4a6945316cea Best regards, -- Justin Stitt diff --git a/drivers/input/rmi4/rmi_f34.c b/drivers/input/rmi4/rmi_f34.c index 0d9a5756e3f5..3b3ac71e53dc 100644 --- a/drivers/input/rmi4/rmi_f34.c +++ b/drivers/input/rmi4/rmi_f34.c @@ -471,7 +471,7 @@ static ssize_t rmi_driver_update_fw_store(struct device *dev, if (buf[count - 1] == '\0' || buf[count - 1] == '\n') copy_count -= 1; - strncpy(fw_name, buf, copy_count); + memcpy(fw_name, buf, copy_count); fw_name[copy_count] = '\0'; ret = request_firmware(&fw, fw_name, dev);