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Date: Wed, 12 Dec 2012 17:59:08 +1100
From: Alexey Kardashevskiy <aik@...abs.ru>
To: Alex Williamson <alex.williamson@...hat.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
kvm@...r.kernel.org, David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH] vfio powerpc: implemented IOMMU driver for VFIO
On 08/12/12 04:01, Alex Williamson wrote:
>> + case VFIO_IOMMU_MAP_DMA: {
>> + vfio_iommu_spapr_tce_dma_map param;
>> + struct iommu_table *tbl = container->tbl;
>> + enum dma_data_direction direction;
>> + unsigned long locked, lock_limit;
>> +
>> + if (WARN_ON(!tbl))
>> + return -ENXIO;
>> +
>> + minsz = offsetofend(vfio_iommu_spapr_tce_dma_map, size);
>> +
>> + if (copy_from_user(¶m, (void __user *)arg, minsz))
>> + return -EFAULT;
>> +
>> + if (param.argsz < minsz)
>> + return -EINVAL;
>> +
>> + if ((param.flags & VFIO_DMA_MAP_FLAG_READ) &&
>> + (param.flags & VFIO_DMA_MAP_FLAG_WRITE))
>> + direction = DMA_BIDIRECTIONAL;
>> + else if (param.flags & VFIO_DMA_MAP_FLAG_READ)
>> + direction = DMA_TO_DEVICE;
>> + else if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
>> + direction = DMA_FROM_DEVICE;
>> + else
>> + return -EINVAL;
>
> flags needs to be sanitized too. Return EINVAL if any unknown bit is
> set or else sloppy users may make it very difficult to make use of those
> flag bits later.
It already returns -EINVAL on any bit set except READ/WRITE, no?
--
Alexey
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