Messages in this thread | | | Subject | Re: [PATCH v4 3/5] iommu/uapi: Use named union for user data | From | Lu Baolu <> | Date | Wed, 8 Jul 2020 10:17:57 +0800 |
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Hi Jacob,
On 7/8/20 7:43 AM, Jacob Pan wrote: > IOMMU UAPI data size is filled by the user space which must be validated > by ther 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. > > Link:https://lkml.org/lkml/2020/6/11/834
Please use lore.kernel.org links.
Best regards, baolu
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