Commits on Oct 18, 2021

1. MmapRegion: relax mmap size constraints …

   For the build_raw() alternative of the MmapRegion,
   the implementation was validating that the length of
   the mapping was a multiple of the page size.
   
   This generally makes sense, since the OS will round up
   to the nearest multiple anyway and only allocate full
   pages.
   There is one corner case though where this needs to be
   relaxed: when mapping a file with a length not divisible
   by the pagesize.
   
   According to the POSIX reference, the length will be rounded
   up and the extra memory zero-ed. Memory accesses will work
   as expected, even beyond the actual file length (but within the
   allocated memory), but any writes will not be persisted to the
   filesystem and the backing device.
   
   This is a use case where mapping an "uneven" length makes sense,
   so that such "out-of-bounds" checks can be caught by accesses
   via vm-memory primitives.
   
   This commit removes this constraint.
   
   Signed-off-by: alindima <[email protected]>

   

   alindima committed Oct 18, 2021
   Configuration menu

   • View commit details
   • Copy full SHA for cc7ea2f
   • Browse repository at this point

   Copy the full SHA

   cc7ea2f View commit details

   Browse the repository at this point in the history