iommu: debug-pagealloc: Check mapped/unmapped kernel memory

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Now, as the page_ext holds count of IOMMU mappings, we can use it to
assert that any page allocated/freed is indeed not in the IOMMU.

The sanitizer doesn’t protect against mapping/unmapping during this
period. However, that’s less harmful as the page is not used by the
kernel.

Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Mostafa Saleh 2026-01-09 17:18:05 +00:00 • committed by Joerg Roedel

parent 7e84593795

commit a8258ffed2

3 changed files with 42 additions and 0 deletions

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23

drivers/iommu/iommu-debug-pagealloc.c

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14

include/linux/iommu-debug-pagealloc.h

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5

include/linux/mm.h

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