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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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6
Kernel/Memory/RegionTree.cpp
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@@ -146,14 +146,14 @@ ErrorOr<VirtualRange> RegionTree::try_allocate_randomized(size_t size, size_t al
ErrorOr<NonnullOwnPtr<Region>> RegionTree::allocate_unbacked_anywhere(size_t size, size_t alignment)
{
auto region = TRY(Region::create_unbacked());
TRY(place_anywhere(*region, size, alignment));
TRY(place_anywhere(*region, RandomizeVirtualAddress::No, size, alignment));
return region;
}
ErrorOr<void> RegionTree::place_anywhere(Region& region, size_t size, size_t alignment)
ErrorOr<void> RegionTree::place_anywhere(Region& region, RandomizeVirtualAddress randomize_virtual_address, size_t size, size_t alignment)
{
SpinlockLocker locker(m_lock);
auto range = TRY(try_allocate_anywhere(size, alignment));
auto range = TRY(randomize_virtual_address == RandomizeVirtualAddress::Yes ? try_allocate_randomized(size, alignment) : try_allocate_anywhere(size, alignment));
region.m_range = range;
m_regions.insert(region.vaddr().get(), region);
return {};