linux-kernel - [PATCH 3.4 29/32] iommu/vt-d: Fixed interaction of VFIO_IOMMU_MAP

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Message-Id: <20131206214959.495148182@linuxfoundation.org>
Date:	Fri,  6 Dec 2013 13:52:39 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Julian Stecklina <jsteckli@...inf.tu-dresden.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	Joerg Roedel <joro@...tes.org>
Subject: [PATCH 3.4 29/32] iommu/vt-d: Fixed interaction of VFIO_IOMMU_MAP_DMA with IOMMU address limits

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julian Stecklina <jsteckli@...inf.tu-dresden.de>

commit f9423606ade08653dd8a43334f0a7fb45504c5cc upstream.

The BUG_ON in drivers/iommu/intel-iommu.c:785 can be triggered from userspace via
VFIO by calling the VFIO_IOMMU_MAP_DMA ioctl on a vfio device with any address
beyond the addressing capabilities of the IOMMU. The problem is that the ioctl code
calls iommu_iova_to_phys before it calls iommu_map. iommu_map handles the case that
it gets addresses beyond the addressing capabilities of its IOMMU.
intel_iommu_iova_to_phys does not.

This patch fixes iommu_iova_to_phys to return NULL for addresses beyond what the
IOMMU can handle. This in turn causes the ioctl call to fail in iommu_map and
(correctly) return EFAULT to the user with a helpful warning message in the kernel
log.

Signed-off-by: Julian Stecklina <jsteckli@...inf.tu-dresden.de>
Acked-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Joerg Roedel <joro@...tes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -778,7 +778,11 @@ static struct dma_pte *pfn_to_dma_pte(st
 	int offset;

 	BUG_ON(!domain->pgd);
-	BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width);
+
+	if (addr_width < BITS_PER_LONG && pfn >> addr_width)
+		/* Address beyond IOMMU's addressing capabilities. */
+		return NULL;
+
 	parent = domain->pgd;

 	while (level > 0) {

--
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