brody-qq a0b021cbcf Kernel/Memory: Fix crash on writes to shared file mmaps ...

Writes to SharedInodeVMObjects could cause a Protection Violation if a
page was marked as dirty by a different process.

This happened due to a combination of 2 things:
* handle_dirty_on_write_fault() was skipped if a page was already marked
  as dirty
* when a page was marked as dirty, only the Region that caused the page
  fault was remapped

This commit:
* fixes the crash by making handle_fault() stop checking if a page was
  marked dirty before running handle_dirty_on_write_fault()
* modifies handle_dirty_on_write_fault() so that it always marks the
  page as dirty and remaps the page (this avoids a 2nd bug that was
  never hit due to the 1st bug)

2024-08-10 16:19:12 +02:00

27 KiB

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