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Kernel: Track user accessibility per Region.
Region now has is_user_accessible(), which informs the memory manager how to map these pages. Previously, we were just passing a "bool user_allowed" to various functions and I'm not at all sure that any of that was correct. All the Region constructors are now hidden, and you must go through one of these helpers to construct a region: - Region::create_user_accessible(...) - Region::create_kernel_only(...) That ensures that we don't accidentally create a Region without specifying user accessibility. :^)
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6 changed files with 73 additions and 30 deletions
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@ -253,7 +253,7 @@ public:
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bool is_superuser() const { return m_euid == 0; }
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Region* allocate_region_with_vmo(VirtualAddress, size_t, NonnullRefPtr<VMObject>, size_t offset_in_vmo, const String& name, int prot);
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Region* allocate_file_backed_region(VirtualAddress, size_t, RefPtr<Inode>&&, const String& name, int prot);
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Region* allocate_file_backed_region(VirtualAddress, size_t, NonnullRefPtr<Inode>, const String& name, int prot);
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Region* allocate_region(VirtualAddress, size_t, const String& name, int prot = PROT_READ | PROT_WRITE, bool commit = true);
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bool deallocate_region(Region& region);
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