From patchwork Mon Sep 21 14:34:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11790097 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 81E1A112C for ; Mon, 21 Sep 2020 14:35:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E479206E5 for ; Mon, 21 Sep 2020 14:35:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Cr3xQBVQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727830AbgIUOf5 (ORCPT ); Mon, 21 Sep 2020 10:35:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727349AbgIUOef (ORCPT ); Mon, 21 Sep 2020 10:34:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 457F5C0613D0; Mon, 21 Sep 2020 07:34:35 -0700 (PDT) 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 Precedence: bulk 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 = -EINVAL; goto out; } - if (type >= 0 - && unlikely(!access_ok(buf, len))) { + if (type != CHECK_IOVEC_ONLY && !access_ok(buf, len)) { ret = -EFAULT; goto out; } @@ -1824,7 +1823,7 @@ static ssize_t compat_rw_copy_check_uvector(int type, } if (len < 0) /* size_t not fitting in compat_ssize_t .. */ goto out; - if (type >= 0 && + if (type != CHECK_IOVEC_ONLY && !access_ok(compat_ptr(buf), len)) { ret = -EFAULT; goto out;