Commits on Feb 11, 2021

1. rpma: mmap() memory for rpma_mr_reg() in rpma_flush_apm_new() …

   The memory region passed to rpma_mr_reg() (ibv_mr_reg())
   cannot be allocated from the heap (using malloc()
   or posix_memalign()), but should be mapped using mmap().
   
   Rationale:
   
   If ibv_fork_init() was called, the memory region
   passed to ibv_mr_reg() is marked by this function
   with flag “do not copy on fork”
   and after having called fork(), the child process
   does not receive this range of virtual addresses.
   If this memory region was allocated from the heap,
   the child process receives a corrupted heap
   with a “hole” of inaccessible addresses inside.
   A memory allocator knows nothing about this “hole”
   and if it tries to access (read or write)
   that range of virtual addresses, it causes a segfault.
   
   Ref: pmem#751

   

   ldorau committed Feb 11, 2021
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