From: David Gibson <david@gibson.dropbear.id.au>
To: "Christian A. Ehrhardt" <lk@c--e.de>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Alex Williamson <alex.williamson@redhat.com>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Michael Ellerman <mpe@ellerman.id.au>,
Cornelia Huck <cohuck@redhat.com>
Subject: Re: [PATCH] vfio/pci: Add missing range check in vfio_pci_mmap
Date: Tue, 13 Apr 2021 10:24:14 +1000 [thread overview]
Message-ID: <YHTkrvXRGrfzJXlv@yekko.fritz.box> (raw)
In-Reply-To: <20210412214124.GA241759@lisa.in-ulm.de>
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On Mon, Apr 12, 2021 at 11:41:24PM +0200, Christian A. Ehrhardt wrote:
>
> When mmaping an extra device region verify that the region index
> derived from the mmap offset is valid.
>
> Fixes: a15b1883fee1 ("vfio_pci: Allow mapping extra regions")
> Cc: stable@vger.kernel.org
> Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> drivers/vfio/pci/vfio_pci.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 65e7e6b44578..5023e23db3bc 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -1656,6 +1656,8 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
>
> index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
>
> + if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
> + return -EINVAL;
> if (vma->vm_end < vma->vm_start)
> return -EINVAL;
> if ((vma->vm_flags & VM_SHARED) == 0)
> @@ -1664,7 +1666,7 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
> int regnum = index - VFIO_PCI_NUM_REGIONS;
> struct vfio_pci_region *region = vdev->region + regnum;
>
> - if (region && region->ops && region->ops->mmap &&
> + if (region->ops && region->ops->mmap &&
> (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
> return region->ops->mmap(vdev, region, vma);
> return -EINVAL;
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2021-04-13 0:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210410230013.GC416417@lisa.in-ulm.de>
[not found] ` <20210412140238.184e141f@omen>
2021-04-12 21:41 ` [PATCH] vfio/pci: Add missing range check in vfio_pci_mmap Christian A. Ehrhardt
2021-04-13 0:24 ` David Gibson [this message]
2021-04-13 6:48 ` Cornelia Huck
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