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| author | Jason Gunthorpe <jgg@nvidia.com> | 2024-08-22 11:45:55 -0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2024-08-26 09:16:13 +0200 |
| commit | 6093cd582f8e027117a8d4ad5d129a1aacdc53d2 (patch) | |
| tree | 0c8881c408e46f556f6c9dca62c60a3051989039 /lib/crypto/mpi/mpi-bit.c | |
| parent | 996dc53ac289b81957aa70d62ccadc6986d26a87 (diff) | |
iommu: Do not return 0 from map_pages if it doesn't do anything
These three implementations of map_pages() all succeed if a mapping is
requested with no read or write. Since they return back to __iommu_map()
leaving the mapped output as 0 it triggers an infinite loop. Therefore
nothing is using no-access protection bits.
Further, VFIO and iommufd rely on iommu_iova_to_phys() to get back PFNs
stored by map, if iommu_map() succeeds but iommu_iova_to_phys() fails that
will create serious bugs.
Thus remove this never used "nothing to do" concept and just fail map
immediately.
Fixes: e5fc9753b1a8 ("iommu/io-pgtable: Add ARMv7 short descriptor support")
Fixes: e1d3c0fd701d ("iommu: add ARM LPAE page table allocator")
Fixes: 745ef1092bcf ("iommu/io-pgtable: Move Apple DART support to its own file")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/2-v1-1211e1294c27+4b1-iommu_no_prot_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'lib/crypto/mpi/mpi-bit.c')
0 files changed, 0 insertions, 0 deletions