Pool allocation question

Hello everyone,

When ExAllocatePoolWithTag allocates less than a page, it stores size of the block and the tag somewhere.
Does it prepend a header to the block?
The documentation says that allocations >= page size are aligned on page size.
If so, where is the header in this case?
How to get the size and tag given start address of the block from code?

(Actually we're interested in NdisAllocateMemory; presumaby on NT it exactly maps to ExAllocate...)

No April 1st replies please ;)

Thanks
--PA


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