Memory Debug Codes

Microsoft's memory management functions often initialize memory with special values. The following article describes frequent used variants.

Microsoft Visual C++ Runtime library

C runtime library provides it own debug codes:

0xCD, 0xCDCDCDCD - New objects. New objects are filled with 0xCD when they are allocated.
0xFD, 0xFDFDFDFD - No-man's land memory. Extra bytes that belong to the internal block allocated, but not the block you requested. They are placed before and after requested blocks and used for data bound checking.
0xDD, 0xDDDDDDDD - Freed blocks. The freed blocks kept unused in the debug heap's linked list when the _CRTDBG_DELAY_FREE_MEM_DF flag is set are currently filled with 0xDD. Although in some cases you won't see magic 0xDDDDDDDD value, as it will be overwritten by another debug function (e.g. 0xFEEEFEEE for HeapFree).

These constants are defined in DbgHeap.c file as

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