CVE-2025-68760 — iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show

In iommu_mmio_write(), it validates the user-provided offset with the check: `iommu->dbg_mmio_offset > iommu->mmio_phys_end - 4`. This assumes a 4-byte access. However, the corresponding show handler, iommu_mmio_show(), uses readq() to perform an 8-byte (64-bit) read.

If a user provides an offset equal to `mmio_phys_end - 4`, the check passes, and will lead to a 4-byte out-of-bounds read.

Fix this by adjusting the boundary check to use sizeof(u64), which corresponds to the size of the readq() operation.

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CVE-2025-68760 — iommu/amd: Fix potential out-of-bounds read in iommu_mmio_show