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kern: implement additional randomness in KPageHeap allocations

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Michael Scire 2022-03-22 15:29:55 -07:00 • committed by SciresM
parent 24739f245e
commit 401047f603
6 changed files with 150 additions and 18 deletions
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8
libraries/libmesosphere/source/kern_k_memory_manager.cpp
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@ -202,7 +202,7 @@ namespace ams::kern {
Impl *chosen_manager = nullptr;
KPhysicalAddress allocated_block = Null<KPhysicalAddress>;
for (chosen_manager = this->GetFirstManager(pool, dir); chosen_manager != nullptr; chosen_manager = this->GetNextManager(chosen_manager, dir)) {
allocated_block = chosen_manager->AllocateBlock(heap_index, true);
allocated_block = chosen_manager->AllocateAligned(heap_index, num_pages, align_pages);
if (allocated_block != Null<KPhysicalAddress>) {
break;
}
@ -213,12 +213,6 @@ namespace ams::kern {
return Null<KPhysicalAddress>;
}
/* If we allocated more than we need, free some. */
const size_t allocated_pages = KPageHeap::GetBlockNumPages(heap_index);
if (allocated_pages > num_pages) {
chosen_manager->Free(allocated_block + num_pages * PageSize, allocated_pages - num_pages);
}
/* Maintain the optimized memory bitmap, if we should. */
if (m_has_optimized_process[pool]) {
chosen_manager->TrackUnoptimizedAllocation(allocated_block, num_pages);