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[2620:137:e000::1:20]) by mx.google.com with ESMTP id fd1-20020a056402388100b004a23153d992si1167883edb.238.2023.02.02.17.33.14; Thu, 02 Feb 2023 17:33:38 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=gvqoqpOS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231575AbjBCB2P (ORCPT + 99 others); Thu, 2 Feb 2023 20:28:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230343AbjBCB2N (ORCPT ); Thu, 2 Feb 2023 20:28:13 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68A1D2CFD0; Thu, 2 Feb 2023 17:28:09 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 1E3CAB8289F; Fri, 3 Feb 2023 01:28:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9FACC433EF; Fri, 3 Feb 2023 01:28:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675387686; bh=YDq9DRcIdKEp/Kugr9aBiusQ8u+FDDTKTPm1TZDr/f4=; h=Date:From:To:Cc:Subject:From; b=gvqoqpOSSNib2tlfvK8CGHUCDMHtfqmB61mU6rLB0+nAxmGZ8BWrhDDfM0G/8/mT8 cZ3rqvfGxy6jIdw2sV1vLbFUWMYm6y0SleW7smBAxgJdOWDs1yWrpfOECUkpRQnOAH yLzOkQNAa27uTG95itmWYHH5KldEqiBj12toXdWvkYjGRPJEZpcKkUwT304JFofCLT ayZ3USV8QVWPt7fMVmOfHtwotw1VEhzVEz4yoN4NXm1RSBKYQ/4/V5w3507ctN/SdZ h1JaPYp69xj72VZ274xfpShjvcYtcjjUo8ILQ5FAl78Ld9M1ARS7arvgEa47b2j16W FILdpib+E6imQ== Date: Thu, 2 Feb 2023 19:28:23 -0600 From: "Gustavo A. R. Silva" To: Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH][next] xen: Replace one-element array with flexible-array member Message-ID: MIME-Version: 1.0 Content-Disposition: inline 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_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756771667381438476?= X-GMAIL-MSGID: =?utf-8?q?1756771667381438476?= One-element arrays are deprecated, and we are replacing them with flexible array members instead. So, replace one-element array with flexible-array member in struct xen_page_directory. This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy() and help us make progress towards globally enabling -fstrict-flex-arrays=3 [1]. This results in no differences in binary output. Link: https://github.com/KSPP/linux/issues/79 Link: https://github.com/KSPP/linux/issues/255 Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1] Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook Reviewed-by: Juergen Gross --- drivers/xen/xen-front-pgdir-shbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/xen-front-pgdir-shbuf.c b/drivers/xen/xen-front-pgdir-shbuf.c index 5c0b5cb5b419..b52e0fa595a9 100644 --- a/drivers/xen/xen-front-pgdir-shbuf.c +++ b/drivers/xen/xen-front-pgdir-shbuf.c @@ -30,7 +30,7 @@ struct xen_page_directory { grant_ref_t gref_dir_next_page; #define XEN_GREF_LIST_END 0 - grant_ref_t gref[1]; /* Variable length */ + grant_ref_t gref[]; /* Variable length */ }; /**