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 X-Spam-Level: X-Spam-Status: No, score=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2E98C48BDF for ; Tue, 15 Jun 2021 10:47:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 844D46142B for ; Tue, 15 Jun 2021 10:47:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231486AbhFOKt7 (ORCPT ); Tue, 15 Jun 2021 06:49:59 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:55678 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231324AbhFOKt5 (ORCPT ); Tue, 15 Jun 2021 06:49:57 -0400 Received: from 1.general.cking.uk.vpn ([10.172.193.212]) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1lt6bn-0003hN-Qd; Tue, 15 Jun 2021 10:47:51 +0000 Subject: Re: [PATCH][next] io_uring: Fix incorrect sizeof operator for copy_from_user call From: Colin Ian King To: Jens Axboe , Pavel Begunkov , io-uring@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210615104541.50529-1-colin.king@canonical.com> Message-ID: <3dcc6900-8361-d52c-003d-21318aa80156@canonical.com> Date: Tue, 15 Jun 2021 11:47:51 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210615104541.50529-1-colin.king@canonical.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/06/2021 11:45, Colin King wrote: > From: Colin Ian King > > Static analysis is warning that the sizeof being used is should be > of *data->tags[i] and not data->tags[i]. Although these are the same > size on 64 bit systems it is not a portable assumption to assume > this is true for all cases. > > Addresses-Coverity: ("Sizeof not portable") > Fixes: d878c81610e1 ("io_uring: hide rsrc tag copy into generic helpers") > Signed-off-by: Colin Ian King > --- > fs/io_uring.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/io_uring.c b/fs/io_uring.c > index d665c9419ad3..6b1a70449749 100644 > --- a/fs/io_uring.c > +++ b/fs/io_uring.c > @@ -7231,7 +7231,7 @@ static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put, > ret = -EFAULT; > for (i = 0; i < nr; i++) { > if (copy_from_user(io_get_tag_slot(data, i), &utags[i], > - sizeof(data->tags[i]))) > + sizeof(*data->tags[i]))) > goto fail; > } > } > Actually, I think there is also an issue on line 7220 too, I'll fix that and re-send.