Java: Introduce a common sanitizer type for types which cannot realistically carry taint. #15291
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The `SimpleScalarSanitizer` class represents common scalar types which cannot realistically carry taint (e.g. primitives/numbers, and eventually UUIDs and Dates)
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Many queries have dataflow/taint-tracking configurations with an
isBarrierdefinition which check if the node's type is aPrimitiveType,BoxedType,NumberType, etc.This introduces a new library
semmle.code.java.security.dataflow.CommonSanitizerswhich contains a new sanitizer classSimpleScalarSanitizer, which represents nodes which cannot realistically carry taint for most queries (e.g. primitives, their boxed equivalents, and numeric types).It also converts existing configurations/sanitizer classes to use
instanceof SimpleScalarSanitizerinstead.Important
I am still debating the naming of the library and class. If there is something better than "SimpleScalarSanitizer", I am open to changing the name.