Does Linux process exist information leakage?

[beyond.hack]

Experts..
> As we know that in virtual memory, virtual pages are allocated for a
> process..and when that memory is used page fault occurs and then handler
> allocates a page frame i.e. Real physical memory..hence our small physical
> memory are able to handle bigger processes...
>
so a information, certainly comes to the "ram" atleast a time...

> So can we do something if we have something that can have DMA ???
> I am just guessing!!
> Plz do suggest..and correct me if i am wrong!!!
>
>
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