heap - How does Windows keeps track of the size of VirtualAllocdBlocks? -


i wonder how windows keeps track of size of "virtualallocdblocks". according windbg memory blocks managed in doubly linked lists. struct (_list_entry) contains 2 pointer. how can size (in windbg) of such block , size stored in memory?

0:008> dt _heap 0x00150000  ntdll!_heap    ...    +0x050 virtualallocdblocks : _list_entry [ 0x3e40000 - 0x13950000 ]    ... 0:008> dt _list_entry 0x3e40000  ntdll!_list_entry  [ 0x3f50000 - 0x150050 ]    +0x000 flink            : 0x03f50000 _list_entry [ 0x4050000 - 0x3e40000 ]    +0x004 blink            : 0x00150050 _list_entry [ 0x3e40000 - 0x13950000 ]


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