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Kernel: Unbreak ASLR in the new RegionTree world

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Functions that allocate and/or place a Region now take a parameter
that tells it whether to randomize unspecified addresses.
This commit is contained in:
Andreas Kling 2022-04-03 18:46:27 +02:00
parent e89c9ed2ca
commit 858b196c59
9 changed files with 33 additions and 27 deletions
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10
Kernel/Memory/MemoryManager.cpp
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@ -457,7 +457,7 @@ UNMAP_AFTER_INIT void MemoryManager::initialize_physical_pages()
// Allocate a virtual address range for our array
// This looks awkward, but it basically creates a dummy region to occupy the address range permanently.
auto& region = *MUST(Region::create_unbacked()).leak_ptr();
MUST(m_region_tree.place_anywhere(region, physical_page_array_pages * PAGE_SIZE));
MUST(m_region_tree.place_anywhere(region, RandomizeVirtualAddress::No, physical_page_array_pages * PAGE_SIZE));
auto range = region.range();
// Now that we have our special m_physical_pages_region region with enough pages to hold the entire array
@ -773,7 +773,7 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_contiguous_kernel_region(
name_kstring = TRY(KString::try_create(name));
auto vmobject = TRY(AnonymousVMObject::try_create_physically_contiguous_with_size(size));
auto region = TRY(Region::create_unplaced(move(vmobject), 0, move(name_kstring), access, cacheable));
TRY(m_region_tree.place_anywhere(*region, size));
TRY(m_region_tree.place_anywhere(*region, RandomizeVirtualAddress::No, size));
TRY(region->map(kernel_page_directory()));
return region;
}
@ -816,7 +816,7 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region(size_t size
name_kstring = TRY(KString::try_create(name));
auto vmobject = TRY(AnonymousVMObject::try_create_with_size(size, strategy));
auto region = TRY(Region::create_unplaced(move(vmobject), 0, move(name_kstring), access, cacheable));
TRY(m_region_tree.place_anywhere(*region, size));
TRY(m_region_tree.place_anywhere(*region, RandomizeVirtualAddress::No, size));
TRY(region->map(kernel_page_directory()));
return region;
}
@ -829,7 +829,7 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region(PhysicalAdd
if (!name.is_null())
name_kstring = TRY(KString::try_create(name));
auto region = TRY(Region::create_unplaced(move(vmobject), 0, move(name_kstring), access, cacheable));
TRY(m_region_tree.place_anywhere(*region, size, PAGE_SIZE));
TRY(m_region_tree.place_anywhere(*region, RandomizeVirtualAddress::No, size, PAGE_SIZE));
TRY(region->map(kernel_page_directory()));
return region;
}
@ -843,7 +843,7 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region_with_vmobje
name_kstring = TRY(KString::try_create(name));
auto region = TRY(Region::create_unplaced(vmobject, 0, move(name_kstring), access, cacheable));
TRY(m_region_tree.place_anywhere(*region, size));
TRY(m_region_tree.place_anywhere(*region, RandomizeVirtualAddress::No, size));
TRY(region->map(kernel_page_directory()));
return region;
}