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[209.132.180.67]) by mx.google.com with ESMTP id z2si1715255edd.390.2019.10.09.09.45.54; Wed, 09 Oct 2019 09:46:18 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@web.de header.s=dbaedf251592 header.b=pojyrmQP; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731542AbfJIQnX (ORCPT + 99 others); Wed, 9 Oct 2019 12:43:23 -0400 Received: from mout.web.de ([212.227.17.11]:46435 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730708AbfJIQnX (ORCPT ); Wed, 9 Oct 2019 12:43:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1570639359; bh=smGGKIWjcKK40LfxXzxyDhqfpPN20hSlgYA0gpL/sBQ=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=pojyrmQPFLUMc40gISVqiGxIQWADfuj/T13jAiJbBOBrt4aSF/lt6gxHGzaDVjZ/J JWr4uyTCkuoRF2Se6xcoEYgPlbMnUr0m23aYgN8pE5J0/PcCX1Qf4qRmkARgcOufej otcf0S7tHY/J46/LJyPKzb9ggULH8JaHx3qKb2ko= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Received: from [192.168.1.2] ([93.132.177.35]) by smtp.web.de (mrweb102 [213.165.67.124]) with ESMTPSA (Nemesis) id 0McFPX-1iYWyW2Nrb-00Jdlz; Wed, 09 Oct 2019 18:42:39 +0200 Subject: Re: string.h: Mark 34 functions with __must_check To: Rasmus Villemoes , kernel-janitors@vger.kernel.org, Alexander Shishkin , Andrew Morton , Andy Shevchenko , Joe Perches , Kees Cook , Nick Desaulniers , Steven Rostedt , Aditya Pakki , Kangjie Lu , Navid Emamdoost , Stephen McCamant Cc: LKML References: <75f70e5e-9ece-d6d1-a2c5-2f3ad79b9ccb@web.de> <954c5d70-742f-7b0e-57ad-ea967e93be89@rasmusvillemoes.dk> From: Markus Elfring Autocrypt: addr=Markus.Elfring@web.de; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <954c5d70-742f-7b0e-57ad-ea967e93be89@rasmusvillemoes.dk> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Provags-ID: V03:K1:tYsVpNEli7z3lMZv4vatBbZYvPfhxXoaH+ONehvlip+PITKHyXz 1Orn+6oP9PafpB1iRD7GQIpjUSXIYuX3FbQMaKWqUmXDuGqBX5wVWww8IyyOEGA9fZUDfSg yFJ5Q8l+KZmRECHgqUXzaXX3tqUqp9i/lxuLwUElNhX9dS2EybwvKCtSOML0lhX7uA+1zgX 3c9Oaq4X7ESvUmoULFhsA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:mqMEwAOJrio=:PeLMaIyql1VA9Jln58WY18 9H0BbX5r4pf4Dbcmke8iUPQc0YxpGzyagYMVBxmt/5KWTzKciYutL1YMnoIG2oLbslqrZeHIP BRu2BZaZ6IYW4xjbg9A7GvsBvsKozlbU1a54j7Yf4UAC/uzvwvG5fJzdosbLOMC/NgH69gZvx wNs67/sEmfN0yjemekLhNj4qUWz/Vha0Ew3KvHPPsTS8l7hEub0XOAPIT58n80K4pnyPQbOTU GMVvD6hYw0Q/Ima4JA2ip28L2THJ5465/9NdxwmoWSV/2sfqEMTL+JissFi1wvbM7loo/f/M1 WJslpZlT2PimkNJvUFAJvJmfCgxs/xYUD1CltSnUFiHoQpRNpmgOq+3BjzhKns+Ek9xsgV+u4 3yzbt+cRINNtC+E+jaEDu+qCg3GKSouUcB/1Rnb1bjt2QWesljw6To/zbeF4UpoblYnxbWbHL DLruZur1/aTKmLehrY4SuFz7hX8BeY5SnWUBrLhFsDxJvcl+KD5/QuVRXUb0Huwj7O3JyM4sD w5OvwBJE8p2VVT67Viye0e5Rz0wYSkEAy/z2j/509CXbdR2bjDrUq0H6s5CtmZf6hDFIqT1r9 KnSYW4f47l6x4M0XcCYTy8ABtVCB2MejnD82Tn3tWU64OoANPCGhPcTXDgDJ5INpRtT7kJ3at czHgUIn9MtAbq8IAIsg9XNkBtpAfGE9N2HfeEFDVdEb79gceuihkmjv39P57muAT5mQuBD6Ny 1uMDZy+li+BXxzhge0K6u4jd2UaCmfRQ4d2uhV7lxq7vhjZKxU8Lcb03bLO52StIby22kS52G J3G3XxEu7nO3KvTimGRS4cRhOOWwslif0BGkA9sKoyd363BTkVExMjVRry5tWShHHR8iRF2o5 TcwCp9YxZZP9VIVXnPuml4dZJ8JXZyTtgFi1DFNz1m3vVC+GcCMS8hSPr9KHgHRD5e6n4l52R dKYM1BMQGuEzHnhroyc+NBg4A45dDqIdXHThOZu7tuuCJi8QXQnsg34m0Z928R+rE+LizJoOt OqI7fUKeYBmXYtsjtlZdqqmCrD24Q7YjrNTWx/SRtScbZpe/+zZYd6lkgnioytPwxdigJ+zAb e8FL3eAO7kyDowzGhDmgTgHPxwXpr+SXDalFnZ9/ref2NHTfWIjUl0Wq2t1nodaUHVsU9AHaC LNxm2M2BXBJbwM/DVXAT+Xu+1uYCnJ5MdcOiEeE5QwZ/AwamcSNDHhp99DGe3bBpAc9kfcLU0 URqsTV0O29/iD0vkqgtKVdvQ5VV5vPsiW8jzpopXuOXU6FXhzTRgX//15P0o= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > You're also not consistent - strlen() is not annotated. Would you like to integrate any additional function annotations? > And, for the standard C functions, -Wall already seems to warn about > an unused call: This detail is nice, isn't it? > a.c:5:2: warning: statement with no effect [-Wunused-value] > strlen(s); Are there any differences to consider for the Linux function variant? > The problem is the __must_check does not mean that the > return value must be followed by a comparison to NULL and bailing out > (that can't really be checked), it simply ensures the return value is > assigned somewhere or used in an if(). So foo->bar = kstrdup() not > followed by a check of foo->bar won't warn. So one would essentially > only catch instant-leaks. How do you think about to improve the source code analysis support any further? Regards, Markus