linux-kernel - Re: [PATCH]: iommu fix potential overflow in alloc

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Date:	Mon, 21 Jul 2008 11:21:39 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH]: iommu fix potential overflow in alloc_iommu()



FUJITA Tomonori wrote:
> On Mon, 21 Jul 2008 10:15:22 -0400
> Prarit Bhargava <prarit@...hat.com> wrote:
>
>   
>> (This didn't appear on LKML or any of the mirrors ... trying again)
>>
>> It is possible that alloc_iommu()'s boundary_size overflows as
>> dma_get_seg_boundary can return 0xffffffff.  In that case, further usage of
>> boundary_size triggers a BUG_ON() in the iommu code.
>>     
>
> Did you actually hit this? pci-gart_64.c is used only by X86_64.
>   

I hit this by declaring a device struct and not declaring a value for 
dev->dma_parms->segment_boundary_mask.

I was attempting to alloc out of the IOMMU and the code then dies on the 
bugcheck in iommu_is_span_boundary() because boundary_size = 0.

P.
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