Add support for large page backed file mapping objects on Linux.

This MR adds support for creating file mapping objects backed by large pages on Linux, by making the following changes:

wineserver

  • On Linux, create_temp_file will first attempt to use memfds as the backing fd. If it fails, it'll return to the current codepath, creating a temporary file in either the server or config directory.
  • The created memfd will be sealed against writes, if the caller requesting the appropriate page protection flags.
  • This removes the requirement that FDs be only created on filesystems/directories that aren't noexec.
  • In the server method create_mapping , if large pages have been requested by the caller, hold that the calling thread's token holds SeLockMemoryPrivilege .
  • Additionally, add SeLockMemoryPrivilege to the list of privileges enabled for the Administrator.

ntdll

  • Add virtual_get_min_large_page_size and its exported wrapper wine_unix_get_min_large_page_size.
  • On Linux, the minimum page size is determined by going through /sys/kernel/mm/hugepages. If hugepage support was not detected, STATUS_NOT_SUPPORTED is returned instead. On other platforms, the older hard-coded value of 2*1024*1024 is returned instead.
  • NtCreateSection will validate certain parameters if large pages are requested. Specifically, it will return STATUS_INVALID_PARAMETER if the requested mapping is not anonymous/unnamed, or the size is not a multiple of the minimum supported page size.

kernelbase

  • GetLargePageMinimum will use wine_unix_get_min_large_page_size.

kernel32/tests

  • Add new test test_large_page_file_mapping, which validates privilege enforcements and parameter validation while creating large pages backed file mapping obejcts. The tests are skipped if GetLargePageMinimum returns 0.
Edited by Vibhav Pant

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