From mboxrd@z Thu Jan 1 00:00:00 1970 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 1162DCE7A88 for ; Sat, 23 Sep 2023 15:02:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231985AbjIWPCD (ORCPT ); Sat, 23 Sep 2023 11:02:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231330AbjIWPB4 (ORCPT ); Sat, 23 Sep 2023 11:01:56 -0400 Received: from omta034.useast.a.cloudfilter.net (omta034.useast.a.cloudfilter.net [44.202.169.33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00FEE19F; Sat, 23 Sep 2023 08:01:49 -0700 (PDT) Received: from eig-obgw-5008a.ext.cloudfilter.net ([10.0.29.246]) by cmsmtp with ESMTP id jx7qqGhLYez0Ck48LqCMbL; Sat, 23 Sep 2023 15:01:25 +0000 Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with ESMTPS id k48iqiIvf22LNk48iqjftS; Sat, 23 Sep 2023 15:01:48 +0000 X-Authority-Analysis: v=2.4 cv=c7O4/Dxl c=1 sm=1 tr=0 ts=650efddc a=1YbLdUo/zbTtOZ3uB5T3HA==:117 a=P7XfKmiOJ4/qXqHZrN7ymg==:17 a=OWjo9vPv0XrRhIrVQ50Ab3nP57M=:19 a=dLZJa+xiwSxG16/P+YVxDGlgEgI=:19 a=IkcTkHD0fZMA:10 a=zNV7Rl7Rt7sA:10 a=wYkD_t78qR0A:10 a=NEAV23lmAAAA:8 a=VnNF1IyMAAAA:8 a=cm27Pg_UAAAA:8 a=VwQbUJbxAAAA:8 a=HvF037n1xESchLcPDVoA:9 a=QEXdDO2ut3YA:10 a=xmb-EsYY8bH0VWELuYED:22 a=AjGcO6oz07-iQ99wixmX:22 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=TgmeyvTv6/GFjXWezYgO1lYXlHOkD/szL9csZtjsEzo=; b=tVe9KZ+4QIkA7YDm03YPplIuLy fcfm5fZMUCCG76tZ/dt97A1650fOQfXUzMtqZuucZOuL/TptgfGsrFhYT1BSR3F0LpJAXB3yKrHZZ mpqDVM2ono0os4bDwHBTx+lpZQVZVhduLJ2Ce90W7iV+6ySy8gIMsqdVOOmjsD2TBgSLrx2iXGxA1 8Le7p94dmdBsApOTKv8ue2R1vcoEKRYros7RJE7KbMPO6WjUTQfYnPdKHAvCploC+SuLuUHy9p1Mo tQRunJO8+BfQ5FsRdsMnMnqFKNh0YnIGhI6ebsyt5ZeF/QS0YG+Hxfq7/OU9DIPqr7/gClPPd3xgQ AnhgWEmg==; Received: from [94.239.20.48] (port=60870 helo=[192.168.1.98]) by gator4166.hostgator.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96) (envelope-from ) id 1qjy5n-003eED-0Y; Sat, 23 Sep 2023 03:34:23 -0500 Message-ID: <4d5e29e0-cd74-37e3-6305-d5c8daedf7c3@embeddedor.com> Date: Sat, 23 Sep 2023 10:35:28 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH] gcov: Annotate struct gcov_iterator with __counted_by Content-Language: en-US To: Kees Cook , Peter Oberparleiter Cc: Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org References: <20230922175220.work.327-kees@kernel.org> From: "Gustavo A. R. Silva" In-Reply-To: <20230922175220.work.327-kees@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 94.239.20.48 X-Source-L: No X-Exim-ID: 1qjy5n-003eED-0Y X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: ([192.168.1.98]) [94.239.20.48]:60870 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 0 X-Org: HG=hgshared;ORG=hostgator; X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfPx2KYC4evmVq6LhRjQQbJhN9T2HIxLxtOhqgv8lLsSAqtg9FZCih74tBZCiW4JhZ5VR8HH9H5hrS0vIZwtFigjjiQPwHz6flC6kyZGSAnMQkDhr3g8Z yPZrvrbPi5YwK02jqpg7N4g1HrB7IYbvVIGWpqugDRVMhlsZQBrQLMfrUBUHEPoU0uOFn6d2GZnD0i41OrFGNkPrwZXDN3W4zWnvOzX4tVGAbdbZ80D+WRv4 wP3VUQQt3qgTCn0aN7FpmGJJPpQfoa2ltRhNp7RspOM= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/22/23 11:52, Kees Cook wrote: > 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 checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct gcov_iterator. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Peter Oberparleiter > Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo > --- > kernel/gcov/fs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c > index 5c3086cad8f9..01520689b57c 100644 > --- a/kernel/gcov/fs.c > +++ b/kernel/gcov/fs.c > @@ -99,7 +99,7 @@ struct gcov_iterator { > struct gcov_info *info; > size_t size; > loff_t pos; > - char buffer[]; > + char buffer[] __counted_by(size); > }; > > /**