Messages in this thread | | | From | Andy Lutomirski <> | Date | Tue, 15 Aug 2017 09:28:21 -0700 | Subject | Re: [PATCH v4 2/3] mm: introduce MAP_VALIDATE a mechanism for adding new mmap flags |
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On Mon, Aug 14, 2017 at 11:12 PM, Dan Williams <dan.j.williams@intel.com> wrote: > The mmap syscall suffers from the ABI anti-pattern of not validating > unknown flags. However, proposals like MAP_SYNC and MAP_DIRECT need a > mechanism to define new behavior that is known to fail on older kernels > without the feature. Use the fact that specifying MAP_SHARED and > MAP_PRIVATE at the same time is invalid as a cute hack to allow a new > set of validated flags to be introduced.
While this is cute, is it actually better than a new syscall?
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