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=-11.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 C3C26C433E2 for ; Mon, 20 Jul 2020 12:38:14 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 93057207FC for ; Mon, 20 Jul 2020 12:38:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="HdBfi7fv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 93057207FC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 6B676855CE; Mon, 20 Jul 2020 12:38:14 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Wb0Pa9k96bpv; Mon, 20 Jul 2020 12:38:13 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id CACD3855F6; Mon, 20 Jul 2020 12:38:13 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B41C0C0894; Mon, 20 Jul 2020 12:38:13 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id AFD4EC016F for ; Mon, 20 Jul 2020 12:38:12 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id A676587E6E for ; Mon, 20 Jul 2020 12:38:12 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tkfWjUpAr6Wy for ; Mon, 20 Jul 2020 12:38:12 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) by hemlock.osuosl.org (Postfix) with ESMTPS id DB65387A5E for ; Mon, 20 Jul 2020 12:38:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1595248690; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wlxgO/hjprq758LS3bEpP1ly/+KkksHeMXbfu4RGOqE=; b=HdBfi7fvwtyckQPRYvmeshg3q2q0HQ4/lL0T2M1NEIdnGihBY0iG+ajCfgidLydn496AT4 p04lGJgNOI1wlQAaJ0y/kD6O7MpKG3mZZL3DUTg00nobSHJW9ff2eaaW/0aX4aeVkvPmcN PEvPFqKSnabhSLEFcrVxw+TsqVgGsCo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-24-6fCf_g1VPKCI--6FnThA-Q-1; Mon, 20 Jul 2020 08:38:06 -0400 X-MC-Unique: 6fCf_g1VPKCI--6FnThA-Q-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 24E551DE1; Mon, 20 Jul 2020 12:38:04 +0000 (UTC) Received: from [10.36.115.54] (ovpn-115-54.ams2.redhat.com [10.36.115.54]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C7AC25C1D4; Mon, 20 Jul 2020 12:37:54 +0000 (UTC) Subject: Re: [PATCH v5 09/15] iommu/vt-d: Check ownership for PASIDs from user-space To: "Liu, Yi L" , "alex.williamson@redhat.com" , "baolu.lu@linux.intel.com" , "joro@8bytes.org" References: <1594552870-55687-1-git-send-email-yi.l.liu@intel.com> <1594552870-55687-10-git-send-email-yi.l.liu@intel.com> From: Auger Eric Message-ID: Date: Mon, 20 Jul 2020 14:37:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Cc: "jean-philippe@linaro.org" , "Tian, Kevin" , "Raj, Ashok" , "kvm@vger.kernel.org" , "stefanha@gmail.com" , "Tian, Jun J" , "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" , "Sun, Yi Y" , "Wu, Hao" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Yi, On 7/20/20 12:18 PM, Liu, Yi L wrote: > Hi Eric, > >> From: Auger Eric >> Sent: Monday, July 20, 2020 12:06 AM >> >> Hi Yi, >> >> On 7/12/20 1:21 PM, Liu Yi L wrote: >>> When an IOMMU domain with nesting attribute is used for guest SVA, a >>> system-wide PASID is allocated for binding with the device and the domain. >>> For security reason, we need to check the PASID passsed from user-space. >> passed > > got it. > >>> e.g. page table bind/unbind and PASID related cache invalidation. >>> >>> Cc: Kevin Tian >>> CC: Jacob Pan >>> Cc: Alex Williamson >>> Cc: Eric Auger >>> Cc: Jean-Philippe Brucker >>> Cc: Joerg Roedel >>> Cc: Lu Baolu >>> Signed-off-by: Liu Yi L >>> Signed-off-by: Jacob Pan >>> --- >>> drivers/iommu/intel/iommu.c | 10 ++++++++++ >>> drivers/iommu/intel/svm.c | 7 +++++-- >>> 2 files changed, 15 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c >>> index 4d54198..a9504cb 100644 >>> --- a/drivers/iommu/intel/iommu.c >>> +++ b/drivers/iommu/intel/iommu.c >>> @@ -5436,6 +5436,7 @@ intel_iommu_sva_invalidate(struct iommu_domain >> *domain, struct device *dev, >>> int granu = 0; >>> u64 pasid = 0; >>> u64 addr = 0; >>> + void *pdata; >>> >>> granu = to_vtd_granularity(cache_type, inv_info->granularity); >>> if (granu == -EINVAL) { >>> @@ -5456,6 +5457,15 @@ intel_iommu_sva_invalidate(struct iommu_domain >> *domain, struct device *dev, >>> (inv_info->granu.addr_info.flags & >> IOMMU_INV_ADDR_FLAGS_PASID)) >>> pasid = inv_info->granu.addr_info.pasid; >>> >>> + pdata = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL); >>> + if (!pdata) { >>> + ret = -EINVAL; >>> + goto out_unlock; >>> + } else if (IS_ERR(pdata)) { >>> + ret = PTR_ERR(pdata); >>> + goto out_unlock; >>> + } >>> + >>> switch (BIT(cache_type)) { >>> case IOMMU_CACHE_INV_TYPE_IOTLB: >>> /* HW will ignore LSB bits based on address mask */ >>> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c >>> index d2c0e1a..212dee0 100644 >>> --- a/drivers/iommu/intel/svm.c >>> +++ b/drivers/iommu/intel/svm.c >>> @@ -319,7 +319,7 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, >> struct device *dev, >>> dmar_domain = to_dmar_domain(domain); >>> >>> mutex_lock(&pasid_mutex); >>> - svm = ioasid_find(INVALID_IOASID_SET, data->hpasid, NULL); I meant while using INVALID_IOASID_SET instead of the actual dmar_domain->ioasid_sid. But I think I've now recovered, the asset is simply not used ;-) >> I do not get what the call was supposed to do before that patch? > > you mean patch 10/15 by "that patch", right? the ownership check should > be done as to prevent illegal bind request from userspace. before patch > 10/15, it should be added. > >>> + svm = ioasid_find(dmar_domain->ioasid_sid, data->hpasid, NULL); >>> if (IS_ERR(svm)) { >>> ret = PTR_ERR(svm); >>> goto out; >>> @@ -436,6 +436,7 @@ int intel_svm_unbind_gpasid(struct iommu_domain >> *domain, >>> struct device *dev, ioasid_t pasid) >>> { >>> struct intel_iommu *iommu = intel_svm_device_to_iommu(dev); >>> + struct dmar_domain *dmar_domain; >>> struct intel_svm_dev *sdev; >>> struct intel_svm *svm; >>> int ret = -EINVAL; >>> @@ -443,8 +444,10 @@ int intel_svm_unbind_gpasid(struct iommu_domain >> *domain, >>> if (WARN_ON(!iommu)) >>> return -EINVAL; >>> >>> + dmar_domain = to_dmar_domain(domain); >>> + >>> mutex_lock(&pasid_mutex); >>> - svm = ioasid_find(INVALID_IOASID_SET, pasid, NULL); >>> + svm = ioasid_find(dmar_domain->ioasid_sid, pasid, NULL); >> just to make sure, about the locking, can't domain->ioasid_sid change >> under the hood? > > I guess not. intel_svm_unbind_gpasid() and iommu_domain_set_attr() > is called by vfio today, and within vfio, there is vfio_iommu->lock. OK Thanks Eric > > Regards, > Yi Liu > >> >> Thanks >> >> Eric >>> if (!svm) { >>> ret = -EINVAL; >>> goto out; >>> > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu