Abstract: Techniques for improving data security and access control at the distributed execution level of distributed computing systems are provided. The techniques can include receiving a data access request from a data processing application to access data, directing the data access request to a security data application, modifying the data access request, executing the modified data access request to obtain data that is responsive to the modified data access request, and providing the obtained data to the data processing application.

Abstract: The invention provides a method and apparatus for dynamic patching for run-time error checking. With the present invention, a program to be error checked is read into memory where a debugging module resides. Such in-memory copy of the program is scanned for load objects. The load objects comprise libraries used by the program being error checked, as well as the main routines of such program. Next, a list of patch sites in the load objects is created and these patch sites corresponds to address locations in the load objects to be patched. Address space is then allocated for sections of the patch area where calls to real checking code resides. Finally, patches are written out to the in-memory copy of the program to be error checked. The original instruction in a patch site is replaced with branch to patch area instruction and the original instruction displaced is stored in the patch site's corresponding section of the patch area.