Shared memory between driver and user

[sansegu]

Hi,



I been read the 'Sharing Memory Between Drivers and Applications' from the
NT insider, and I have a serious doubt about how to call a driver function
within the contest of the user application.



The problem is that for calling MmMapLockedPagesSpecifyCache() function I
need to be in the user space, but I think that I must do this call from the
driver.



Textually, the article says:



'.you must call the function from within the context of the process into
which you want to map the buffer.'



How can I do this?



Thanks in advance.

 

[Pavel A.]

Of course MmMapLockedPagesSpecifyCache can't be caled from usermode.
An usermode app calls ReadFile, WriteFile, or ioctl; the driver that handles
these requests, receives them (in kernel mode) in the context of user application.
And you thought it's simple... Not quite
--PA