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MmIsAddressValid instead of __try?

 
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iPromise
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PostPosted: Wed May 18, 2011 10:57 pm    Post subject: MmIsAddressValid instead of __try? Reply with quote
I've been doing some research on how the driver works, and I stumbled across the memory routines of the driver where I found the API MmIsAddressValid. MmIsAddressValid checks if a page fault would occur if we read / write from the virtual address specified.

Quote:

The MmIsAddressValid routine checks whether a page fault will occur for a read or write operation at a given virtual address.


So my question is, would using MmIsAddressValid be a faster and more convenient way to check if addresses are read/writable then trying to read the address and handling a possible exception?
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Slugsnack
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PostPosted: Thu May 19, 2011 2:37 am    Post subject: Reply with quote
yes even though that function is not recommended for use. also at a driver level there are far better ways of performing the tasks you are after
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