From patchwork Sat Oct 3 10:01:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11815169 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 4CCCD6CA for ; Sat, 3 Oct 2020 10:02:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3021F206DB for ; Sat, 3 Oct 2020 10:02:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725842AbgJCKCC convert rfc822-to-8bit (ORCPT ); Sat, 3 Oct 2020 06:02:02 -0400 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:24838 "EHLO us-smtp-delivery-44.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbgJCKCB (ORCPT ); Sat, 3 Oct 2020 06:02:01 -0400 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-374-o1tP11ugOfO_vsKHpUl3HA-1; Sat, 03 Oct 2020 06:01:59 -0400 X-MC-Unique: o1tP11ugOfO_vsKHpUl3HA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BCE86802B75; Sat, 3 Oct 2020 10:01:57 +0000 (UTC) Received: from bahia.lan (ovpn-112-192.ams2.redhat.com [10.36.112.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id 148CB60C15; Sat, 3 Oct 2020 10:01:52 +0000 (UTC) Subject: [PATCH v3 1/3] vhost: Don't call access_ok() when using IOTLB From: Greg Kurz To: "Michael S. Tsirkin" , Jason Wang Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, Laurent Vivier , David Gibson Date: Sat, 03 Oct 2020 12:01:52 +0200 Message-ID: <160171931213.284610.2052489816407219136.stgit@bahia.lan> In-Reply-To: <160171888144.284610.4628526949393013039.stgit@bahia.lan> References: <160171888144.284610.4628526949393013039.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=groug@kaod.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org When the IOTLB device is enabled, the vring addresses we get from userspace are GIOVAs. It is thus wrong to pass them down to access_ok() which only takes HVAs. Access validation is done at prefetch time with IOTLB. Teach vq_access_ok() about that by moving the (vq->iotlb) check from vhost_vq_access_ok() to vq_access_ok(). This prevents vhost_vring_set_addr() to fail when verifying the accesses. No behavior change for vhost_vq_access_ok(). BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1883084 Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") Cc: jasowang@redhat.com CC: stable@vger.kernel.org # 4.14+ Signed-off-by: Greg Kurz Acked-by: Jason Wang --- drivers/vhost/vhost.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index b45519ca66a7..c3b49975dc28 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1290,6 +1290,11 @@ static bool vq_access_ok(struct vhost_virtqueue *vq, unsigned int num, vring_used_t __user *used) { + /* If an IOTLB device is present, the vring addresses are + * GIOVAs. Access validation occurs at prefetch time. */ + if (vq->iotlb) + return true; + return access_ok(desc, vhost_get_desc_size(vq, num)) && access_ok(avail, vhost_get_avail_size(vq, num)) && access_ok(used, vhost_get_used_size(vq, num)); @@ -1383,10 +1388,6 @@ bool vhost_vq_access_ok(struct vhost_virtqueue *vq) if (!vq_log_access_ok(vq, vq->log_base)) return false; - /* Access validation occurs at prefetch time with IOTLB */ - if (vq->iotlb) - return true; - return vq_access_ok(vq, vq->num, vq->desc, vq->avail, vq->used); } EXPORT_SYMBOL_GPL(vhost_vq_access_ok); From patchwork Sat Oct 3 10:02:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11815171 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 9A6EA6CA for ; Sat, 3 Oct 2020 10:02:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B06A206CA for ; Sat, 3 Oct 2020 10:02:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725870AbgJCKCS convert rfc822-to-8bit (ORCPT ); Sat, 3 Oct 2020 06:02:18 -0400 Received: from us-smtp-delivery-44.mimecast.com ([207.211.30.44]:40644 "EHLO us-smtp-delivery-44.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbgJCKCR (ORCPT ); Sat, 3 Oct 2020 06:02:17 -0400 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-203-fajacoYON_SSdHYDcB0WXA-1; Sat, 03 Oct 2020 06:02:10 -0400 X-MC-Unique: fajacoYON_SSdHYDcB0WXA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9A6171005E5A; Sat, 3 Oct 2020 10:02:08 +0000 (UTC) Received: from bahia.lan (ovpn-112-192.ams2.redhat.com [10.36.112.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id D1BBC10027AB; Sat, 3 Oct 2020 10:02:03 +0000 (UTC) Subject: [PATCH v3 2/3] vhost: Use vhost_get_used_size() in vhost_vring_set_addr() From: Greg Kurz To: "Michael S. Tsirkin" , Jason Wang Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, Laurent Vivier , David Gibson Date: Sat, 03 Oct 2020 12:02:03 +0200 Message-ID: <160171932300.284610.11846106312938909461.stgit@bahia.lan> In-Reply-To: <160171888144.284610.4628526949393013039.stgit@bahia.lan> References: <160171888144.284610.4628526949393013039.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The open-coded computation of the used size doesn't take the event into account when the VIRTIO_RING_F_EVENT_IDX feature is present. Fix that by using vhost_get_used_size(). Signed-off-by: Greg Kurz Acked-by: Jason Wang --- drivers/vhost/vhost.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index c3b49975dc28..9d2c225fb518 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1519,8 +1519,7 @@ static long vhost_vring_set_addr(struct vhost_dev *d, /* Also validate log access for used ring if enabled. */ if ((a.flags & (0x1 << VHOST_VRING_F_LOG)) && !log_access_ok(vq->log_base, a.log_guest_addr, - sizeof *vq->used + - vq->num * sizeof *vq->used->ring)) + vhost_get_used_size(vq, vq->num))) return -EINVAL; } From patchwork Sat Oct 3 10:02:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 11815173 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 020756CA for ; Sat, 3 Oct 2020 10:02:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7BE1206CD for ; Sat, 3 Oct 2020 10:02:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725891AbgJCKC0 convert rfc822-to-8bit (ORCPT ); Sat, 3 Oct 2020 06:02:26 -0400 Received: from us-smtp-delivery-44.mimecast.com ([205.139.111.44]:29446 "EHLO us-smtp-delivery-44.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725884AbgJCKCX (ORCPT ); Sat, 3 Oct 2020 06:02:23 -0400 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-378-tgmJOLFBPUuJiiTYcs74xg-1; Sat, 03 Oct 2020 06:02:18 -0400 X-MC-Unique: tgmJOLFBPUuJiiTYcs74xg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E5F43185A0C1; Sat, 3 Oct 2020 10:02:16 +0000 (UTC) Received: from bahia.lan (ovpn-112-192.ams2.redhat.com [10.36.112.192]) by smtp.corp.redhat.com (Postfix) with ESMTP id C57B110013C4; Sat, 3 Oct 2020 10:02:14 +0000 (UTC) Subject: [PATCH v3 3/3] vhost: Don't call log_access_ok() when using IOTLB From: Greg Kurz To: "Michael S. Tsirkin" , Jason Wang Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, Laurent Vivier , David Gibson Date: Sat, 03 Oct 2020 12:02:13 +0200 Message-ID: <160171933385.284610.10189082586063280867.stgit@bahia.lan> In-Reply-To: <160171888144.284610.4628526949393013039.stgit@bahia.lan> References: <160171888144.284610.4628526949393013039.stgit@bahia.lan> User-Agent: StGit/0.21 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=groug@kaod.org X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: kaod.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org When the IOTLB device is enabled, the log_guest_addr that is passed by userspace to the VHOST_SET_VRING_ADDR ioctl, and which is then written to vq->log_addr, is a GIOVA. All writes to this address are translated by log_user() to writes to an HVA, and then ultimately logged through the corresponding GPAs in log_write_hva(). No logging will ever occur with vq->log_addr in this case. It is thus wrong to pass vq->log_addr and log_guest_addr to log_access_vq() which assumes they are actual GPAs. Introduce a new vq_log_used_access_ok() helper that only checks accesses to the log for the used structure when there isn't an IOTLB device around. Signed-off-by: Greg Kurz Acked-by: Jason Wang --- drivers/vhost/vhost.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 9d2c225fb518..9ad45e1d27f0 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1370,6 +1370,20 @@ bool vhost_log_access_ok(struct vhost_dev *dev) } EXPORT_SYMBOL_GPL(vhost_log_access_ok); +static bool vq_log_used_access_ok(struct vhost_virtqueue *vq, + void __user *log_base, + bool log_used, + u64 log_addr) +{ + /* If an IOTLB device is present, log_addr is a GIOVA that + * will never be logged by log_used(). */ + if (vq->iotlb) + return true; + + return !log_used || log_access_ok(log_base, log_addr, + vhost_get_used_size(vq, vq->num)); +} + /* Verify access for write logging. */ /* Caller should have vq mutex and device mutex */ static bool vq_log_access_ok(struct vhost_virtqueue *vq, @@ -1377,8 +1391,7 @@ static bool vq_log_access_ok(struct vhost_virtqueue *vq, { return vq_memory_access_ok(log_base, vq->umem, vhost_has_feature(vq, VHOST_F_LOG_ALL)) && - (!vq->log_used || log_access_ok(log_base, vq->log_addr, - vhost_get_used_size(vq, vq->num))); + vq_log_used_access_ok(vq, log_base, vq->log_used, vq->log_addr); } /* Can we start vq? */ @@ -1517,9 +1530,9 @@ static long vhost_vring_set_addr(struct vhost_dev *d, return -EINVAL; /* Also validate log access for used ring if enabled. */ - if ((a.flags & (0x1 << VHOST_VRING_F_LOG)) && - !log_access_ok(vq->log_base, a.log_guest_addr, - vhost_get_used_size(vq, vq->num))) + if (!vq_log_used_access_ok(vq, vq->log_base, + a.flags & (0x1 << VHOST_VRING_F_LOG), + a.log_guest_addr)) return -EINVAL; }