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Kernel: Allow preventing kmalloc and kfree
For "destructive" disallowance of allocations throughout the system, Thread gains a member that controls whether allocations are currently allowed or not. kmalloc checks this member on both allocations and deallocations (with the exception of early boot) and panics the kernel if allocations are disabled. This will allow for critical sections that can't be allowed to allocate to fail-fast, making for easier debugging. PS: My first proper Kernel commit :^)
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2 changed files with 12 additions and 2 deletions
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@ -362,8 +362,12 @@ void* kmalloc(size_t size)
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Thread* current_thread = Thread::current();
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if (!current_thread)
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current_thread = Processor::idle_thread();
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if (current_thread)
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if (current_thread) {
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// FIXME: By the time we check this, we have already allocated above.
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// This means that in the case of an infinite recursion, we can't catch it this way.
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VERIFY(current_thread->is_allocation_enabled());
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PerformanceManager::add_kmalloc_perf_event(*current_thread, size, (FlatPtr)ptr);
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}
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return ptr;
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}
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@ -384,8 +388,10 @@ void kfree_sized(void* ptr, size_t size)
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Thread* current_thread = Thread::current();
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if (!current_thread)
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current_thread = Processor::idle_thread();
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if (current_thread)
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if (current_thread) {
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VERIFY(current_thread->is_allocation_enabled());
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PerformanceManager::add_kfree_perf_event(*current_thread, 0, (FlatPtr)ptr);
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}
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}
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g_kmalloc_global->deallocate(ptr, size);
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