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=-15.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 C26E3C433EF for ; Tue, 14 Sep 2021 16:54:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 51CAD61164 for ; Tue, 14 Sep 2021 16:54:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 51CAD61164 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id EC33A6B0071; Tue, 14 Sep 2021 12:54:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E71CD6B0073; Tue, 14 Sep 2021 12:54:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D3B246B0074; Tue, 14 Sep 2021 12:54:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0024.hostedemail.com [216.40.44.24]) by kanga.kvack.org (Postfix) with ESMTP id C66996B0071 for ; Tue, 14 Sep 2021 12:54:05 -0400 (EDT) Received: from smtpin37.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 864AE8249980 for ; Tue, 14 Sep 2021 16:54:05 +0000 (UTC) X-FDA: 78586776450.37.3ABEFBA Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by imf23.hostedemail.com (Postfix) with ESMTP id 196F4900009B for ; Tue, 14 Sep 2021 16:54:04 +0000 (UTC) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.0.43) with SMTP id 18EF0L8M022464; Tue, 14 Sep 2021 12:54:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=date : from : to : cc : subject : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=pp1; bh=GfG/7HI3i+q7EZLlPaNnfg+JTXf1jkJ/F4TGRx7dM9U=; b=fu5yc1MUC2APxvzhkk1GqW/OndgryVFmSchtjsi+2sn16t3UeGnJt76kb6VKnE/CWpd8 IZQA7DxPiTmK32m/z2M4OBMzp3k0k34FoiPFxP540kYNkpN61omIC+n4uIuwWj7eUsR8 32XYhhyVTeaWHkyypIrc7x6wrfy0uU7f2n3DAZ/PSX6PR8OhvwuIMl39pHSlJmdhH/lL SnUkffvA7wBpHTTKcPM7wP1wz/nv+zKioDaSK305E6i7bEcVofEVlzbb5jq8ZkJMKiDK bPM2FxoEyx1fb00ddYbdEg/LDgf8POCy0TSNNjnCwetgD9Pu/yvavQZpyNavcb8wyF9w Jg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3b2x0gjuwf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Sep 2021 12:54:03 -0400 Received: from m0098399.ppops.net (m0098399.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 18EF1b6o026966; Tue, 14 Sep 2021 12:54:03 -0400 Received: from ppma06fra.de.ibm.com (48.49.7a9f.ip4.static.sl-reverse.com [159.122.73.72]) by mx0a-001b2d01.pphosted.com with ESMTP id 3b2x0gjuvh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Sep 2021 12:54:03 -0400 Received: from pps.filterd (ppma06fra.de.ibm.com [127.0.0.1]) by ppma06fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 18EGrTbO031893; Tue, 14 Sep 2021 16:54:00 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma06fra.de.ibm.com with ESMTP id 3b0kqjnbkg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 14 Sep 2021 16:54:00 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 18EGnOmL40305050 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Sep 2021 16:49:24 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6303311C050; Tue, 14 Sep 2021 16:53:56 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D141711C054; Tue, 14 Sep 2021 16:53:55 +0000 (GMT) Received: from p-imbrenda (unknown [9.145.8.12]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 Sep 2021 16:53:55 +0000 (GMT) Date: Tue, 14 Sep 2021 18:53:53 +0200 From: Claudio Imbrenda To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Christian Borntraeger , Janosch Frank , Cornelia Huck , Heiko Carstens , Vasily Gorbik , Niklas Schnelle , Gerald Schaefer , Ulrich Weigand Subject: Re: [PATCH resend RFC 5/9] s390/uv: fully validate the VMA before calling follow_page() Message-ID: <20210914185353.11693a22@p-imbrenda> In-Reply-To: <20210909162248.14969-6-david@redhat.com> References: <20210909162248.14969-1-david@redhat.com> <20210909162248.14969-6-david@redhat.com> Organization: IBM X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Z1PLCzsiM64_PBNjRurTNJIZ4AAUrBEd X-Proofpoint-ORIG-GUID: sUjOLi-GmuYEiGWMqjuSpFwe9VIEEt-c X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.687,Hydra:6.0.235,FMLib:17.0.607.475 definitions=2020-10-13_15,2020-10-13_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 phishscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 adultscore=0 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109140081 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 196F4900009B X-Stat-Signature: 7yf5j38zpqd7wx4x7f3f3ocgfiuzftte Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=fu5yc1MU; spf=pass (imf23.hostedemail.com: domain of imbrenda@linux.ibm.com designates 148.163.156.1 as permitted sender) smtp.mailfrom=imbrenda@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com X-HE-Tag: 1631638444-109271 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000090, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 9 Sep 2021 18:22:44 +0200 David Hildenbrand wrote: > We should not walk/touch page tables outside of VMA boundaries when > holding only the mmap sem in read mode. Evil user space can modify the > VMA layout just before this function runs and e.g., trigger races with > page table removal code since commit dd2283f2605e ("mm: mmap: zap pages > with read mmap_sem in munmap"). > > find_vma() does not check if the address is >= the VMA start address; > use vma_lookup() instead. > > Fixes: 214d9bbcd3a6 ("s390/mm: provide memory management functions for protected KVM guests") > Signed-off-by: David Hildenbrand Reviewed-by: Claudio Imbrenda > --- > arch/s390/kernel/uv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c > index aeb0a15bcbb7..193205fb2777 100644 > --- a/arch/s390/kernel/uv.c > +++ b/arch/s390/kernel/uv.c > @@ -227,7 +227,7 @@ int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb) > uaddr = __gmap_translate(gmap, gaddr); > if (IS_ERR_VALUE(uaddr)) > goto out; > - vma = find_vma(gmap->mm, uaddr); > + vma = vma_lookup(gmap->mm, uaddr); > if (!vma) > goto out; > /*