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iommu/dma: Fix domain init

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Despite carefully rewording the kerneldoc to describe the new direct
interaction with dma_range_map, it seems I managed to confuse myself in
removing the redundant force_aperture check and ended up making the code
not do that at all. This led to dma_range_maps inadvertently being able
to set iovad->start_pfn = 0, and all the nonsensical chaos which ensues
from there. Restore the correct behaviour of constraining base_pfn to
the domain aperture regardless of dma_range_map, and not trying to apply
dma_range_map constraints to the basic IOVA domain since they will be
properly handled with reserved regions later.

Reported-by: Jon Hunter <jonathanh@nvidia.com>
Reported-by: Jerry Snitselaar <jsnitsel@redhat.com>
Fixes: e28a114243d1 ("iommu/dma: Make limit checks self-contained")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Robin Murphy 2024-05-20 20:14:44 +01:00 committed by Xilin Wu
parent 50930e9d56
commit 15c80e749c
1 changed files with 4 additions and 4 deletions
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8
drivers/iommu/dma-iommu.c
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@ -686,15 +686,15 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, struct device *dev
/* Check the domain allows at least some access to the device... */
if (map) {
dma_addr_t base = dma_range_map_min(map);
if (base > domain->geometry.aperture_end ||
if (dma_range_map_min(map) > domain->geometry.aperture_end ||
dma_range_map_max(map) < domain->geometry.aperture_start) {
pr_warn("specified DMA range outside IOMMU capability\n");
return -EFAULT;
}
/* ...then finally give it a kicking to make sure it fits */
base_pfn = max(base, domain->geometry.aperture_start) >> order;
}
/* ...then finally give it a kicking to make sure it fits */
base_pfn = max_t(unsigned long, base_pfn,
domain->geometry.aperture_start >> order);
/* start_pfn is always nonzero for an already-initialised domain */
mutex_lock(&cookie->mutex);