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Sun, 7 Jul 2019 15:03:29 +0000 (UTC) Subject: Re: [PATCH v7 4/6] vfio/type1: check dma map request is within a valid iova range To: Shameer Kolothum , alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com References: <20190626151248.11776-1-shameerali.kolothum.thodi@huawei.com> <20190626151248.11776-5-shameerali.kolothum.thodi@huawei.com> From: Auger Eric Message-ID: Date: Sun, 7 Jul 2019 17:03:28 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190626151248.11776-5-shameerali.kolothum.thodi@huawei.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Sun, 07 Jul 2019 15:03:35 +0000 (UTC) Cc: kevin.tian@intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, xuwei5@hisilicon.com, linuxarm@huawei.com, iommu@lists.linux-foundation.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Hi Shameer, On 6/26/19 5:12 PM, Shameer Kolothum wrote: > This checks and rejects any dma map request outside valid iova > range. > > Signed-off-by: Shameer Kolothum > --- > v6 --> v7 > > Addressed the case where a container with only an mdev device will > have an empty list(Suggested by Alex). > --- > drivers/vfio/vfio_iommu_type1.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c > index e872fb3a0f39..89ad0da7152c 100644 > --- a/drivers/vfio/vfio_iommu_type1.c > +++ b/drivers/vfio/vfio_iommu_type1.c > @@ -1050,6 +1050,27 @@ static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma, > return ret; > } > > +/* > + * Check dma map request is within a valid iova range > + */ > +static bool vfio_iommu_iova_dma_valid(struct vfio_iommu *iommu, > + dma_addr_t start, dma_addr_t end) > +{ > + struct list_head *iova = &iommu->iova_list; > + struct vfio_iova *node; > + > + list_for_each_entry(node, iova, list) { > + if (start >= node->start && end <= node->end) > + return true; > + } > + > + /* > + * Check for list_empty() as well since a container with > + * only an mdev device will have an empty list. > + */ > + return list_empty(&iommu->iova_list); iova Besides Reviewed-by: Eric Auger Thanks Eric > +} > + > static int vfio_dma_do_map(struct vfio_iommu *iommu, > struct vfio_iommu_type1_dma_map *map) > { > @@ -1093,6 +1114,11 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, > goto out_unlock; > } > > + if (!vfio_iommu_iova_dma_valid(iommu, iova, iova + size - 1)) { > + ret = -EINVAL; > + goto out_unlock; > + } > + > dma = kzalloc(sizeof(*dma), GFP_KERNEL); > if (!dma) { > ret = -ENOMEM; > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu