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=-12.5 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,URIBL_BLOCKED,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 32E6FC43464 for ; Fri, 18 Sep 2020 13:04:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5D03E21D7B for ; Fri, 18 Sep 2020 13:04:12 +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="sY+q9nG0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5D03E21D7B 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 DA1386B008A; Fri, 18 Sep 2020 09:04:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D2C2E900005; Fri, 18 Sep 2020 09:04:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BCA4C900004; Fri, 18 Sep 2020 09:04:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0031.hostedemail.com [216.40.44.31]) by kanga.kvack.org (Postfix) with ESMTP id 9C9CD6B0089 for ; Fri, 18 Sep 2020 09:04:11 -0400 (EDT) Received: from smtpin10.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 68690824999B for ; Fri, 18 Sep 2020 13:04:11 +0000 (UTC) X-FDA: 77276200302.10.shop31_1f1070a2712b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin10.hostedemail.com (Postfix) with ESMTP id 398F816A06B; Fri, 18 Sep 2020 13:04:11 +0000 (UTC) X-HE-Tag: shop31_1f1070a2712b X-Filterd-Recvd-Size: 3284 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf48.hostedemail.com (Postfix) with ESMTP; Fri, 18 Sep 2020 13:04:10 +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=JS63/rqkwUNTXwLowQfzdacfYjAtRcLXlr++78o/BT4=; b=sY+q9nG0cOiCMUx60dsbMGVPCz LVrYVhlOm2U0rDRkmCim2mpUjwSFA6xVzz7XwcQDo4SGRAVwynXQreWP6XBiVGi0g8W953f/N5oAl fMg12npyy16DCpLmH5VyXk669QwmnN85j6R0RkgK4f6gMcC3WoQ2pca3RMQOVsobTRfwuN1EThzdb jmGzqX9W6pU1MU4WfYmm+VGPkudgq8nJGWoYHdACNbyNatdhwXgx392LSabw4WcTao2KVrdLM7tlC iBsImmimlsk8J7PE28Q6ManmOx7kcJttWHAavkEleNAMRyHiwRuRenktDL1zD4kI4xDUsqKE4hm8M JLB9Xxjg==; Received: from [80.122.85.238] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kJFlk-0008T4-DQ; Fri, 18 Sep 2020 12:45:40 +0000 From: Christoph Hellwig To: Alexander Viro Cc: Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , linux-arm-kernel@lists.infradead.org, x86@kernel.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 3/9] fs: explicitly check for CHECK_IOVEC_ONLY in rw_copy_check_uvector Date: Fri, 18 Sep 2020 14:45:27 +0200 Message-Id: <20200918124533.3487701-4-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200918124533.3487701-1-hch@lst.de> References: <20200918124533.3487701-1-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 number representation. Signed-off-by: Christoph Hellwig --- fs/read_write.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/fs/read_write.c b/fs/read_write.c index 5db58b8c78d0dd..f153116bc5399b 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -840,8 +840,7 @@ ssize_t rw_copy_check_uvector(int type, const struct = iovec __user * uvector, ret =3D -EINVAL; goto out; } - if (type >=3D 0 - && unlikely(!access_ok(buf, len))) { + if (type !=3D CHECK_IOVEC_ONLY && unlikely(!access_ok(buf, len))) { ret =3D -EFAULT; goto out; } @@ -911,7 +910,7 @@ ssize_t compat_rw_copy_check_uvector(int type, } 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