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Kernel: Fix overly loose MemoryManager::kernel_region_from_vaddr()
It's not enough to just find the largest-address-not-above the argument,
we must also check that the found region actually contains the argument.
Regressed in a23edd42b8
, thanks to Idan
for pointing this out.
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Notes:
sideshowbarker
2024-07-17 22:58:54 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/813593a4856
@ -623,7 +623,7 @@ Region* MemoryManager::kernel_region_from_vaddr(VirtualAddress vaddr)
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auto* region_ptr = MM.m_kernel_regions.find_largest_not_above(vaddr.get());
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if (!region_ptr)
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return nullptr;
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return *region_ptr;
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return (*region_ptr)->contains(vaddr) ? *region_ptr : nullptr;
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}
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Region* MemoryManager::find_user_region_from_vaddr_no_lock(AddressSpace& space, VirtualAddress vaddr)
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