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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 513F3C4346D for ; Mon, 21 Sep 2020 14:34:52 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F127B22262 for ; Mon, 21 Sep 2020 14:34:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Cr3xQBVQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F127B22262 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 905D8900078; Mon, 21 Sep 2020 10:34:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 88EEC900076; Mon, 21 Sep 2020 10:34:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 70AC8900077; Mon, 21 Sep 2020 10:34:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0035.hostedemail.com [216.40.44.35]) by kanga.kvack.org (Postfix) with ESMTP id 3E9DF900076 for ; Mon, 21 Sep 2020 10:34:40 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id F3CDE181AEF1A for ; Mon, 21 Sep 2020 14:34:39 +0000 (UTC) X-FDA: 77287314720.05.nest74_00007ad27145 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id CC3831801A225; Mon, 21 Sep 2020 14:34:39 +0000 (UTC) X-HE-Tag: nest74_00007ad27145 X-Filterd-Recvd-Size: 3364 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf13.hostedemail.com (Postfix) with ESMTP; Mon, 21 Sep 2020 14:34:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=hvHVjgb7+ogIHMv2QziVfmEo4wIHVDzxSBO7sgqq+LI=; b=Cr3xQBVQWALKH7tuoir4RRrOx5 ObtytscKgX2pD9jdFKZl7OAaSGqHvKMY6QdN1AAeL7iPRdfGMnnuAKRp2fO3zs/Qa1qanBrJcMzlp 2i6iNQiXjZlAfSdr8eSouVvMxW6Jwy5mKeEirvXr3ZTTiIIwvkxrQMh9XAJw5QuRUQsbNqdCQQyyW WDrgFWFBzIj4YkZNzY0XDygo/V19wuSoL2WQzUur+fGNL+3uLi2J6QXLcsQR+yhOTXD5FmYG9PgHH hyhjGiAZI27lRyg9jFDzu3lo4ZZQVp8d384XapZSVtaSeOjqaz3u6nukSqWN2rkY3CEe6gIiU4FAO cLQDX6OQ==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kKMtc-0007rU-GX; Mon, 21 Sep 2020 14:34:24 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , David Laight , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 04/11] iov_iter: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector Date: Mon, 21 Sep 2020 16:34:27 +0200 Message-Id: <20200921143434.707844-5-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921143434.707844-1-hch@lst.de> References: <20200921143434.707844-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Explicitly check for the magic value insted of implicitly relying on its numeric representation. Also drop the rather pointless unlikely annotation. Signed-off-by: Christoph Hellwig --- lib/iov_iter.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index d7e72343c360eb..a64867501a7483 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1709,8 +1709,7 @@ static ssize_t rw_copy_check_uvector(int type, ret =3D -EINVAL; goto out; } - if (type >=3D 0 - && unlikely(!access_ok(buf, len))) { + if (type !=3D CHECK_IOVEC_ONLY && !access_ok(buf, len)) { ret =3D -EFAULT; goto out; } @@ -1824,7 +1823,7 @@ static ssize_t compat_rw_copy_check_uvector(int typ= e, } if (len < 0) /* size_t not fitting in compat_ssize_t .. */ goto out; - if (type >=3D 0 && + if (type !=3D CHECK_IOVEC_ONLY && !access_ok(compat_ptr(buf), len)) { ret =3D -EFAULT; goto out; --=20 2.28.0