Detecting memory errors using write integrity testing
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United States of America Patent
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Apr 30, 2013
Grant Date -
Oct 1, 2009
app pub date -
Mar 28, 2008
filing date -
Mar 28, 2008
priority date (Note) -
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Abstract
Methods of detecting memory errors using write integrity testing are described. In an embodiment, additional analysis is performed when a program is compiled. This analysis identifies a set of objects which can be written by each instruction in the program. Additional code is then inserted into the program so that, at runtime, the program checks before performing a write instruction that the particular object being written is one of the set of objects that it is allowed to write. The inserted code causes an exception to be raised if this check fails and allows the write to proceed if the check is successful. In a further embodiment, code may also be inserted to perform checks before indirect control-flow transfer instructions, to ensure that those instructions cannot transfer control to locations different from those intended.
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