[PATCH v2 0/2] ACPI: IORT: validate node and RMR extents

[Pengpeng Hou <pengpeng@iscas.ac.cn>]

The original patch combined the generic IORT node walk with the
IOMMU-specific RMR descriptor and ID-mapping arrays.  This version
separates those contracts as requested.

Patch 1 validates the root node area, complete node headers and advertised
node lengths in each generic walker.  Patch 2, built only with
CONFIG_IOMMU_API, validates the fixed RMR payload and both arrays before
walking them.

Changes since v1:
https://lore.kernel.org/all/20260706094300.82618-1-pengpeng@iscas.ac.cn/
- split generic traversal from RMR array validation
- validate root node_offset and node_count before pointer construction
- scope RMR helpers with their CONFIG_IOMMU_API users
- document why a zero-count array needs no offset validation

Testing used Linux 3d6d817622b0 plus this series, GCC 13.3 and QEMU
8.2.2 with a Cortex-A57 arm64 CPU model.  A temporary KUnit harness in
iort.c called the actual static validation helpers; the harness is not
part of this series.  The acpi_iort_bounds suite passed both tests,
covering invalid root offsets, truncated node and RMR payload extents,
and out-of-bounds RMR descriptor and ID-mapping arrays.

This did not exercise a platform-provided IORT table through the complete
boot-time discovery path.

Pengpeng Hou (2):
  ACPI: IORT: validate table and node extents before traversal
  ACPI: IORT: validate RMR node array extents

 drivers/acpi/arm64/iort.c | 117 +++++++++++++++++++++++++++++++++++---
 1 file changed, 109 insertions(+), 8 deletions(-)


base-commit: 3d6d817622b0a9721e3cc404df3469171582be13
-- 
2.50.1 (Apple Git-155)