Looking through the source code I didn't see anything specific to an in-kernel only encryption key.
My thought would be to add an extra flag into the session_op structure indicating that the session should just ignore any data in the ioctl call. Thus, instead of the copy_from_user call, the function would be modified to retrieve the key data from some other kernel source. I also this could be accomplished by some sort of negative value indicators for the key lengths or NULL for the key pointers passed in in the session_op ioctl, but that seems more like magic. Adding another ioctl definition also seems undesired. Does anyone have any guidance for a convention?
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