iommu/uapi: Use named union for user data

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IOMMU UAPI data size is filled by the user space which must be validated
by the kernel. To ensure backward compatibility, user data can only be
extended by either re-purpose padding bytes or extend the variable sized
union at the end. No size change is allowed before the union. Therefore,
the minimum size is the offset of the union.

To use offsetof() on the union, we must make it named.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/linux-iommu/20200611145518.0c2817d6@x1.home/
Link: https://lore.kernel.org/r/1601051567-54787-4-git-send-email-jacob.jun.pan@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Jacob Pan 2020-09-25 09:32:44 -07:00 • committed by Joerg Roedel

parent 1e6aaae93e

commit 8d3bb3b8cb

3 changed files with 14 additions and 14 deletions

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22

drivers/iommu/intel/iommu.c

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2

drivers/iommu/intel/svm.c

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4

include/uapi/linux/iommu.h

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