* Fix a bug where configuration error ends up doing a huge allocation, rather than catching the error. Add some documentation to the slabmgr code.
* Add a unit test and some documentation to answer the question in issue #107. I can't see how offset and map_start would end up being different.
* Rewrite of SGX file_map to remove TOCTTTOU now passes all unit tests
* Apply a similar fix to file_read.
* Factor complicated verification code into a common helper routine.
* Adjust the memory copying strategy so that all bits in the returned buffed are exactly the same bits as verified in the trusted, scratch buffer.
* Fixing the TOCTOU issue in file checking
* Adding comments for load_trusted_file() and copy_and_check_trusted_file(); Deprecate the old design
* Documenting the file checking mechanism
Don Porter
c68cb42e20