I know that in kernel space one usually uses ExAllocatePoolWithTag function, but I don't know how to allocate memory for a dynamically-sized array of fixed-sized arrays of chars (kind of 2x2 matrix of which the number of lines could dynamically increase).
1 Answers
You can use Lookaside lists for allocating fixed-size buffers (in your case fixed-sized arrays of chars) dynamically.
You can read more about it on MSDN, the documentation for it is very well written:
https://docs.microsoft.com/en-us/windows-hardware/drivers/kernel/using-lookaside-lists
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