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Kernel: Scrub kmalloc slabs when allocated and deallocated

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This matches the behavior of the generic subheaps (and the old slab
allocator implementation.)
This commit is contained in:
Andreas Kling 2021-12-26 18:53:04 +01:00
parent 3399b6c57f
commit 63e1b904a4
1 changed files with 4 additions and 0 deletions
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4
Kernel/Heap/kmalloc.cpp
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@ -119,11 +119,15 @@ public:
auto* ptr = block->allocate(); auto* ptr = block->allocate();
if (block->is_full()) if (block->is_full())
m_full_blocks.append(*block); m_full_blocks.append(*block);
memset(ptr, KMALLOC_SCRUB_BYTE, m_slab_size);
return ptr; return ptr;
} }
void deallocate(void* ptr) void deallocate(void* ptr)
{ {
memset(ptr, KFREE_SCRUB_BYTE, m_slab_size);
auto* block = (KmallocSlabBlock*)((FlatPtr)ptr & KmallocSlabBlock::block_mask); auto* block = (KmallocSlabBlock*)((FlatPtr)ptr & KmallocSlabBlock::block_mask);
bool block_was_full = block->is_full(); bool block_was_full = block->is_full();
block->deallocate(ptr); block->deallocate(ptr);