[LOG4J2-3680] Allow deserialization of arrays #2259
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vy
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Feb 5, 2024
log4j-api/src/main/java/org/apache/logging/log4j/util/internal/SerializationUtil.java
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The `DefaultObjectInputFilter` is too restrictive and it does not allow the deserialization of **arrays** of classes in the `SerializationUtil#REQUIRED_JAVA_CLASSES` and `SerializationUtil#REQUIRED_JAVA_PACKAGES` white lists. Most notably `RuntimeException` can not be deserialized, since it contains an array of `StackTraceElement`s. Both classes are allowed, but deserialization of the array fails.
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The
DefaultObjectInputFilteris too restrictive and it does not allow the deserialization of arrays of whitelisted classes.Most notably
RuntimeExceptioncan not be deserialized, since it contains an array ofStackTraceElements. Both classes are allowed, but deserialization of theStackTraceElement[]array fails.We also replace all manual serializations/deserializations in test classes to calls to
SerialUtil. This guarantees a consistent behavior of all tests under Java 8 and Java 9+.