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LibJS: Randomize GC heap block locations
Allocate GC heap blocks with mmap(MAP_RANDOMIZED) for ASLR. This may very well be too aggressive in terms of fragmentation, and we can figure out ways to scale that back once it becomes a big problem. For now, this makes the GC heap a lot less predictable for an attacker.
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@ -38,7 +38,7 @@ NonnullOwnPtr<HeapBlock> HeapBlock::create_with_cell_size(Heap& heap, size_t cel
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char name[64];
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snprintf(name, sizeof(name), "LibJS: HeapBlock(%zu)", cell_size);
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#ifdef __serenity__
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auto* block = (HeapBlock*)serenity_mmap(nullptr, block_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, block_size, name);
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auto* block = (HeapBlock*)serenity_mmap(nullptr, block_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_RANDOMIZED | MAP_PRIVATE, 0, 0, block_size, name);
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#else
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auto* block = (HeapBlock*)aligned_alloc(block_size, block_size);
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#endif
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