Re: [PATCH v2] iommu: amd: Fix IO_PAGE_FAULT due to __unmap_single() size overflow
On Wed, Jun 24, 2020 at 01:58:27PM +0200, Joerg Roedel wrote: > Hi Greg, > > On Wed, Jun 24, 2020 at 11:09:06AM +0200, Greg KH wrote: > > So what exact stable kernel version(s) do you want to see this patch > > applied to? > > It is needed in kernels <= v5.4. Linux v5.5 has replaced the code with > the bug. This doesn't apply to any older kernels that I can see :( ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH v2] iommu: amd: Fix IO_PAGE_FAULT due to __unmap_single() size overflow
Hi Greg, On Wed, Jun 24, 2020 at 11:09:06AM +0200, Greg KH wrote: > So what exact stable kernel version(s) do you want to see this patch > applied to? It is needed in kernels <= v5.4. Linux v5.5 has replaced the code with the bug. Joerg ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH v2] iommu: amd: Fix IO_PAGE_FAULT due to __unmap_single() size overflow
On Wed, Jun 24, 2020 at 08:41:21AM +, Suravee Suthikulpanit wrote:
> Currently, an integer is used to specify the size in unmap_sg().
> With 2GB worth of pages (512k 4k pages), it requires 31 bits
> (i.e. (1 << 19) << 12), which overflows the integer, and ends up
> unmapping more pages than intended. Subsequently, this results in
> IO_PAGE_FAULT.
>
> Uses size_t instead of int to pass parameter to __unmap_single().
>
> Please note that this patch is only for the stable-kernels tree
> because the commit be62dbf554c5 ("iommu/amd: Convert AMD iommu driver
> to the dma-iommu api"), which removes the function unmap_sg()
> was introduced in v5.5. This patch is not applicable in subsequent
> kernel versions.
>
> Cc: sta...@vger.kernel.org
> Cc: iommu@lists.linux-foundation.org
> Reported-by: Robert Lippert
> Signed-off-by: Suravee Suthikulpanit
Acked-by: Joerg Roedel
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[PATCH v2] iommu: amd: Fix IO_PAGE_FAULT due to __unmap_single() size overflow
Currently, an integer is used to specify the size in unmap_sg().
With 2GB worth of pages (512k 4k pages), it requires 31 bits
(i.e. (1 << 19) << 12), which overflows the integer, and ends up
unmapping more pages than intended. Subsequently, this results in
IO_PAGE_FAULT.
Uses size_t instead of int to pass parameter to __unmap_single().
Please note that this patch is only for the stable-kernels tree
because the commit be62dbf554c5 ("iommu/amd: Convert AMD iommu driver
to the dma-iommu api"), which removes the function unmap_sg()
was introduced in v5.5. This patch is not applicable in subsequent
kernel versions.
Cc: sta...@vger.kernel.org
Cc: iommu@lists.linux-foundation.org
Reported-by: Robert Lippert
Signed-off-by: Suravee Suthikulpanit
---
drivers/iommu/amd_iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 32de8e7bb8b4..7adc021932b8 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2670,7 +2670,7 @@ static void unmap_sg(struct device *dev, struct
scatterlist *sglist,
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
unsigned long startaddr;
- int npages;
+ size_t npages;
domain = get_domain(dev);
if (IS_ERR(domain))
--
2.17.1
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Re: [PATCH v2] iommu: amd: Fix IO_PAGE_FAULT due to __unmap_single() size overflow
On Wed, Jun 24, 2020 at 08:41:21AM +, Suravee Suthikulpanit wrote:
> Currently, an integer is used to specify the size in unmap_sg().
> With 2GB worth of pages (512k 4k pages), it requires 31 bits
> (i.e. (1 << 19) << 12), which overflows the integer, and ends up
> unmapping more pages than intended. Subsequently, this results in
> IO_PAGE_FAULT.
>
> Uses size_t instead of int to pass parameter to __unmap_single().
>
> Please note that this patch is only for the stable-kernels tree
> because the commit be62dbf554c5 ("iommu/amd: Convert AMD iommu driver
> to the dma-iommu api"), which removes the function unmap_sg()
> was introduced in v5.5. This patch is not applicable in subsequent
> kernel versions.
So what exact stable kernel version(s) do you want to see this patch
applied to?
thanks,
greg k-h
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