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iommu: Switch gather->end to the inclusive end

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[ Upstream commit 862c3715de8f3e5350489240c951d697f04bd8c9 ]

Currently gather->end is "unsigned long" which may be overflow in
arch32 in the corner case: 0xfff00000 + 0x100000(iova + size).
Although it doesn't affect the size(end - start), it affects the checking
"gather->end < end"

This patch changes this "end" to the real end address
(end = start + size - 1). Correspondingly, update the length to
"end - start + 1".

Fixes: a7d20dc19d ("iommu: Introduce struct iommu_iotlb_gather for batching TLB flushes")
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210107122909.16317-5-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yong Wu 2021-01-07 20:29:06 +08:00 committed by Greg Kroah-Hartman
parent 2dbc0ea1d1
commit 48e6713713
3 changed files with 4 additions and 4 deletions
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2
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
View File

@ -2267,7 +2267,7 @@ static void arm_smmu_iotlb_sync(struct iommu_domain *domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start,
arm_smmu_tlb_inv_range(gather->start, gather->end - gather->start + 1,
gather->pgsize, true, smmu_domain);
}

2
drivers/iommu/mtk_iommu.c
View File

@ -445,7 +445,7 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather)
{
struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
size_t length = gather->end - gather->start;
size_t length = gather->end - gather->start + 1;
if (gather->start == ULONG_MAX)
return;

4
include/linux/iommu.h
View File

@ -169,7 +169,7 @@ enum iommu_dev_features {
* struct iommu_iotlb_gather - Range information for a pending IOTLB flush
*
* @start: IOVA representing the start of the range to be flushed
* @end: IOVA representing the end of the range to be flushed (exclusive)
* @end: IOVA representing the end of the range to be flushed (inclusive)
* @pgsize: The interval at which to perform the flush
*
* This structure is intended to be updated by multiple calls to the
@ -536,7 +536,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather,
unsigned long iova, size_t size)
{
unsigned long start = iova, end = start + size;
unsigned long start = iova, end = start + size - 1;
/*
* If the new page is disjoint from the current range or is mapped at