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| author | Jason Gunthorpe <[email protected]> | 2025-04-25 13:08:37 +0000 |
|---|---|---|
| committer | Joerg Roedel <[email protected]> | 2025-04-28 11:33:30 +0000 |
| commit | e586e22974d2b7acbef3c6c3e01b2d5ce69efe33 (patch) | |
| tree | 2eeb7c061345c43f1b8eb858157d57e4ecf6e1cd /drivers/iommu/intel/nested.c | |
| parent | iommu: Handle yet another race around registration (diff) | |
| download | kernel-e586e22974d2b7acbef3c6c3e01b2d5ce69efe33.tar.gz kernel-e586e22974d2b7acbef3c6c3e01b2d5ce69efe33.zip | |
iommu: Protect against overflow in iommu_pgsize()
On a 32 bit system calling:
iommu_map(0, 0x40000000)
When using the AMD V1 page table type with a domain->pgsize of 0xfffff000
causes iommu_pgsize() to miscalculate a result of:
size=0x40000000 count=2
count should be 1. This completely corrupts the mapping process.
This is because the final test to adjust the pagesize malfunctions when
the addition overflows. Use check_add_overflow() to prevent this.
Fixes: b1d99dc5f983 ("iommu: Hook up '->unmap_pages' driver callback")
Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Lu Baolu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>
Diffstat (limited to 'drivers/iommu/intel/nested.c')
0 files changed, 0 insertions, 0 deletions