From patchwork Wed Sep 15 09:50:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 512198 Delivered-To: patch@linaro.org Received: by 2002:a02:c816:0:0:0:0:0 with SMTP id p22csp7091jao; Wed, 15 Sep 2021 02:52:05 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxaxntph3ZVXmRN/hywQCg+G0OsEfWvhSFlipaPQdOF3N0UZfk0+/a5JBe1vu282bA76Pka X-Received: by 2002:a05:6602:2ac7:: with SMTP id m7mr17471638iov.66.1631699525784; Wed, 15 Sep 2021 02:52:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1631699525; cv=none; d=google.com; s=arc-20160816; b=qzkyfRwaj267QEy2n4+qqob3oOR0Pt65MwMTqt5PF0GoyolNt3RWo03tVsrMjTx5G1 zt/hA2KA6euFDditW7kPNbgxiSfDu5+hjOfKyacB4IaBHq3g/0Z+7PJF+SGsVHm7ENSO eghpHkw9jnzoEJRV2flKQH9cLwnkIrUXWA/zxyNoq/lSjsB3LisyGkGbg31oUdC7f1RX rVyHtkqYBp3GOx+L/yJUxPVw+07I3r/E9eVZV2JohtJ+Bdq9xKZ4S6hgZNVkeT5VbhFT ZyBzI1eeAEvw4qjyl5B+Z24S4nfWyzPlzBAzLOlbiP6PYnQibgaQ4UHHVMZL4jPnQ9E9 /xqw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:references:in-reply-to:message-id :date:subject:cc:to:from; bh=4Ky03Sw7enQXnO7Oim7pKP55CF/A7WE6L/x3mheJ9Gs=; b=AzzjPRKScTtVsro58ZMD3J5TuGck4AnzM2s5QgIJl44eO3ZI/m7qau96syZ2GUIDns A6989teGmAspScUoFqTMkWb1yclGmysJplELMEh99Gx1/broQzsKnvTt9XGsukQuz3Tv zWGIiFMpx12b0RmeM0Bvwk/ViFwf9pAtAtFPV2An1UCGMlv5RBoeqsZVq/h9I0uGNrxe 7ogMNNSDN/q/INMl3Qandref8dWyBy6nq/dhMer1CP9aqvY9GKyBxDZsUO3KiKHA21Ny rJ6k2ZC62STlIt46HSEkL2YYPV7XFljqL9gF3bvVW2TK3SuhBbMOM60YttVOlh9QtUDt ezKA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-crypto-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id f11si12578541iok.80.2021.09.15.02.52.05; Wed, 15 Sep 2021 02:52:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-crypto-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237547AbhIOJxV (ORCPT + 3 others); Wed, 15 Sep 2021 05:53:21 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3819 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237498AbhIOJxD (ORCPT ); Wed, 15 Sep 2021 05:53:03 -0400 Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4H8b5p1l85z67xQJ; Wed, 15 Sep 2021 17:49:18 +0800 (CST) Received: from lhreml710-chm.china.huawei.com (10.201.108.61) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Wed, 15 Sep 2021 11:51:42 +0200 Received: from A2006125610.china.huawei.com (10.47.83.177) by lhreml710-chm.china.huawei.com (10.201.108.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Wed, 15 Sep 2021 10:51:36 +0100 From: Shameer Kolothum To: , , CC: , , , , , , , Subject: [PATCH v3 5/6] hisi_acc_vfio_pci: Restrict access to VF dev BAR2 migration region Date: Wed, 15 Sep 2021 10:50:36 +0100 Message-ID: <20210915095037.1149-6-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20210915095037.1149-1-shameerali.kolothum.thodi@huawei.com> References: <20210915095037.1149-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.83.177] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To lhreml710-chm.china.huawei.com (10.201.108.61) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org HiSilicon ACC VF device BAR2 region consists of both functional register space and migration control register space. From a security point of view, it's not advisable to export the migration control region to Guest. Hence, override the ioctl/read/write/mmap methods to hide the migration region and limit the access only to the functional register space. Signed-off-by: Shameer Kolothum --- drivers/vfio/pci/hisi_acc_vfio_pci.c | 122 ++++++++++++++++++++++++++- 1 file changed, 118 insertions(+), 4 deletions(-) -- 2.17.1 diff --git a/drivers/vfio/pci/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisi_acc_vfio_pci.c index c847bc469644..e968e955fcd4 100644 --- a/drivers/vfio/pci/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisi_acc_vfio_pci.c @@ -13,6 +13,120 @@ #include #include +static int hisi_acc_pci_rw_access_check(struct vfio_device *core_vdev, + size_t count, loff_t *ppos, + size_t *new_count) +{ + unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos); + struct vfio_pci_core_device *vdev = + container_of(core_vdev, struct vfio_pci_core_device, vdev); + + if (index == VFIO_PCI_BAR2_REGION_INDEX) { + loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK; + resource_size_t end = pci_resource_len(vdev->pdev, index) / 2; + + /* Check if access is for migration control region */ + if (pos >= end) + return -EINVAL; + + *new_count = min(count, (size_t)(end - pos)); + } + + return 0; +} + +static int hisi_acc_vfio_pci_mmap(struct vfio_device *core_vdev, + struct vm_area_struct *vma) +{ + struct vfio_pci_core_device *vdev = + container_of(core_vdev, struct vfio_pci_core_device, vdev); + unsigned int index; + + index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); + if (index == VFIO_PCI_BAR2_REGION_INDEX) { + u64 req_len, pgoff, req_start; + resource_size_t end = pci_resource_len(vdev->pdev, index) / 2; + + req_len = vma->vm_end - vma->vm_start; + pgoff = vma->vm_pgoff & + ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1); + req_start = pgoff << PAGE_SHIFT; + + if (req_start + req_len > end) + return -EINVAL; + } + + return vfio_pci_core_mmap(core_vdev, vma); +} + +static ssize_t hisi_acc_vfio_pci_write(struct vfio_device *core_vdev, + const char __user *buf, size_t count, + loff_t *ppos) +{ + size_t new_count = count; + int ret; + + ret = hisi_acc_pci_rw_access_check(core_vdev, count, ppos, &new_count); + if (ret) + return ret; + + return vfio_pci_core_write(core_vdev, buf, new_count, ppos); +} + +static ssize_t hisi_acc_vfio_pci_read(struct vfio_device *core_vdev, + char __user *buf, size_t count, + loff_t *ppos) +{ + size_t new_count = count; + int ret; + + ret = hisi_acc_pci_rw_access_check(core_vdev, count, ppos, &new_count); + if (ret) + return ret; + + return vfio_pci_core_read(core_vdev, buf, new_count, ppos); +} + +static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int cmd, + unsigned long arg) +{ + struct vfio_pci_core_device *vdev = + container_of(core_vdev, struct vfio_pci_core_device, vdev); + + if (cmd == VFIO_DEVICE_GET_REGION_INFO) { + struct pci_dev *pdev = vdev->pdev; + struct vfio_region_info info; + unsigned long minsz; + + minsz = offsetofend(struct vfio_region_info, offset); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz) + return -EINVAL; + + if (info.index == VFIO_PCI_BAR2_REGION_INDEX) { + info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); + + /* + * ACC VF dev BAR2 region(64K) consists of both functional + * register space and migration control register space. + * Report only the first 32K(functional region) to Guest. + */ + info.size = pci_resource_len(pdev, info.index) / 2; + + info.flags = VFIO_REGION_INFO_FLAG_READ | + VFIO_REGION_INFO_FLAG_WRITE | + VFIO_REGION_INFO_FLAG_MMAP; + + return copy_to_user((void __user *)arg, &info, minsz) ? + -EFAULT : 0; + } + } + return vfio_pci_core_ioctl(core_vdev, cmd, arg); +} + static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev) { struct vfio_pci_core_device *vdev = @@ -32,10 +146,10 @@ static const struct vfio_device_ops hisi_acc_vfio_pci_ops = { .name = "hisi-acc-vfio-pci", .open_device = hisi_acc_vfio_pci_open_device, .close_device = vfio_pci_core_close_device, - .ioctl = vfio_pci_core_ioctl, - .read = vfio_pci_core_read, - .write = vfio_pci_core_write, - .mmap = vfio_pci_core_mmap, + .ioctl = hisi_acc_vfio_pci_ioctl, + .read = hisi_acc_vfio_pci_read, + .write = hisi_acc_vfio_pci_write, + .mmap = hisi_acc_vfio_pci_mmap, .request = vfio_pci_core_request, .match = vfio_pci_core_match, };