[Linaro-mm-sig] [PATCH 1/2] dma-buf: Require VM_PFNMAP vma for mmap
Jason Gunthorpe
jgg at ziepe.ca
Wed Feb 24 18:46:57 UTC 2021
On Wed, Feb 24, 2021 at 09:45:51AM +0100, Daniel Vetter wrote:
> Hm I figured everyone just uses MAP_SHARED for buffer objects since
> COW really makes absolutely no sense. How would we enforce this?
In RDMA we test
drivers/infiniband/core/ib_core_uverbs.c: if (!(vma->vm_flags & VM_SHARED))
During mmap to reject use of MAP_PRIVATE on BAR pages.
Jason
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