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 EB8D1C433F5 for ; Mon, 14 Feb 2022 10:50:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242837AbiBNKua (ORCPT ); Mon, 14 Feb 2022 05:50:30 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:38792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349373AbiBNKuD (ORCPT ); Mon, 14 Feb 2022 05:50:03 -0500 Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B6FE652E1; Mon, 14 Feb 2022 02:14:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1644833643; bh=NJguhNB55E9/WKFECmG7d2N9Rue9x0n0DNEEN++l5Nk=; h=X-UI-Sender-Class:Date:Subject:To:Cc:References:From:In-Reply-To; b=PBq75XyjJzomQaVQCtYpr6NpWOhh4v+uoB5qNLGE8NK1q6PcgvesWNjionklyiJbP AANdOxtu/GYJzC9EcAMvjUxWqcZVLomXNeWWCjcaKlWds4OIJh69nFtwhsokzqHbRK dU04RtYo8Z+lK++cFJq9O3relYGs2gfZxX8sU1us= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [192.168.20.60] ([92.116.168.11]) by mail.gmx.net (mrgmx004 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MIwzA-1nYSaP36Py-00KN34; Mon, 14 Feb 2022 11:14:03 +0100 Message-ID: <886cb762-2532-c170-d615-d7ddf1e1561c@gmx.de> Date: Mon, 14 Feb 2022 11:13:56 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH] fat: Use pointer to d_name[0] in put_user() for compat case Content-Language: en-US To: Andreas Schwab , David Laight Cc: OGAWA Hirofumi , "linux-kernel@vger.kernel.org" , Andrew Morton , "linux-parisc@vger.kernel.org" References: <49a26b7a30254d9fb9653c2f815eaa28@AcuMS.aculab.com> <8735klx0fv.fsf@igel.home> From: Helge Deller In-Reply-To: <8735klx0fv.fsf@igel.home> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:18jQ/5rJjEX5ks5twOE2mKlfPxOdq4oPQ1bQlJtKcaHDKLgz0H5 miXvP8Jp8DpK5m1kKhQvEKkk1iNFWQU1MJx+Gmk1EA5Vk/SPQrB42ziPdXQV1B6q94dVXFa guxIdqp6P2/o1mlL3BGTMMZfjYefh0tcgDXwDJy6V/mDPd+CyoP5huAQcgg16RoCgvtEmiQ IgBN7u7G5Ql/Gqt8lYwqg== X-UI-Out-Filterresults: notjunk:1;V03:K0:fE5wd9SVEes=:eAZblA0EVauqZK7lkJZNB6 P3UYP6IMHiUCXxgR7Sosn+hO3IhgwZtlggfWpc958E76o2hlQAr2bImpO6GdFz1TJklziD7kG swcXdsF/+KRtXXawx9ZP7lDj9IZERiAe0scLnXHWGC+oBxj786gjH9sd5Q59rAixkQSAXV4KV 3aEW5PNjCXFFrbmbpwkBsnBPLs66iPG03hzy722BakOxyjj76pg+fOy3dLWeNIOj1Y4DqgwDQ 6oiZZ5N6ACZBxjjSzct13bCsIKA9gaOed3BMQAxjf96KDfsjWi4C1KBrP6qeqHQZyLRPuG+9e PcFQmZ5G4aJDQkzd9x08Yo+K7h5yy+HEiN5Blmwk73n2zrI1xqsGzuTwf5hjiHJw9CYSJ5gj4 FWDe5d5WNa9L/Cq0Cse9zv97ibxKnBvLKrn3q9kSwuWg1nStW6H1BZcUfySEizRizpLI3gqon Y/eUkRFVQ3lB2zP6n1ws33O755gmthcfMkNOeaX81EhB70XeRdx4MQ9GFway0cHhh1ayQs6C+ QXsN7QyijlQnJFy+RNQC9zbOvl2LUHPm5yNCbYKxvYki2MWm4ojjIedQiw8JDu6Leqw7GlMWc sCb+ivqJ8spWpsnMSxzznugCQELLvzfkDc1IKDnhBkbrNgjG+m4HTBFNlQGAPZcNU00eJEtOW zX1Iiw4umYw0qEm2KYC/RKHoHry92OBXas+l8Q53xsHy3b+1WyGu8HFSfZ17zOxNTy6LZDEX+ eolPkf14CawsekWGunu0SrExLsd0qS6+2iFzXleJlgX6o8J21q7m5MgOrjt9QNsYcotnpvJOn 6b+PXHxvGt2p0buzvbR6wo7uzzQ4ZgJx5bPCWweri+EY+XQOSbzJk1VEjdUhuOMBv8NK9/fGG nvvwvaFooW+0n8uLuaSwhfzpBxoRo4nW+fLgxol4GgJkUFeHUS7mWGA4GUoTJ2yqJ1WBe71fM z2yn5dTXDdanWM4ld6jL9BPhi9v9WcH+pQSzJQAzG+sPkqyfpps1h7mBFzf9TvlMpvnS8r72Q kJYak93TP/5ECYK9mFXeNjfFXs4Xw/gbH24jyHth5b9rI99NuOLO0K1P+p1wl8Y6BGrHnPrqz jQKh8otGF4BYLM= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/14/22 10:27, Andreas Schwab wrote: > On Feb 14 2022, David Laight wrote: > >> The 'bug' is caused by put_user() trying to do: >> __typeof__(ptr) __ptr =3D ptr; >> where __typeof__ is returning char[n] not char *. >> >> I've tried a few things but can't get __typeof__ to >> generate a suitable type for both a simple type and array. > > Does it work to use __typeof__(&*(ptr))? Yes, this works. Helge