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Kernel: Let's also not consider kernel regions to be valid user stacks

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This one is less obviously exploitable than the previous one, but still
a bug nonetheless.
This commit is contained in:
Andreas Kling
2019-12-31 00:27:04 +01:00
parent 0fc24fe256
commit 66d5ebafa6
1 changed files with 2 additions and 2 deletions
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4
Kernel/VM/MemoryManager.cpp
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@@ -586,8 +586,8 @@ void MemoryManager::unquickmap_page()
bool MemoryManager::validate_user_stack(const Process& process, VirtualAddress vaddr) const
{
auto* region = region_from_vaddr(process, vaddr);
return region && region->is_stack();
auto* region = user_region_from_vaddr(const_cast<Process&>(process), vaddr);
return region && region->is_user_accessible() && region->is_stack();
}
bool MemoryManager::validate_user_read(const Process& process, VirtualAddress vaddr) const