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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
Java

JAVA.CLASS.CLONE.SCNC : clone Subclass of Non-clonable (Java)

Summary

A subclass of a non-cloneable class may be cloned.

The clone() method is used to generate a clone of an object, that is, a distinct instance with the same behavior as the original one. The default implementation in java.lang.Object checks that the object to clone either implements the java.lang.Cloneable interface or throws a java.lang.CloneNotSupportedException.

In order to clone an object it is generally sufficient to implement java.lang.Cloneable and use the default implementation of clone(). It is also possible to override that default implementation. Note that a class that inherits the default implementation allows its subclasses to implement java.lang.Cloneable and clone its instances.

Properties

Class Name clone Subclass of Non-clonable (Java)
Significance reliability
Mnemonic JAVA.CLASS.CLONE.SCNC
Categories
CWE CWE:491 Public cloneable() Method Without Final ('Object Hijack')
CERT-Java CERT-Java:OBJ07-J Sensitive classes must not let themselves be copied
Availability Available for Java and Kotlin.
Enabling Checks for this warning class are disabled by default, and require strict Java analysis mode which is also disabled by default. To enable the checks, make the following changes to the project configuration file. 
JAVA_ANALYSIS_STRICT_MODE = Yes
WARNING_FILTER += allow class="clone Subclass of Non-clonable (Java)"

Example 

// TestClone2.java
  public class TestClone2 {   /* "clone Subclass of Non-clonable (Java)" warning issued here 
                               * - Subclasses of TestClone2 could exploit the default clone() method to get a  
                               *   complete dump of the private data of the class instances. 
                               * - Resolve by defining the class as final. 
                               */ 
    private int data;
    private String s;

    public TestClone2(int data, String s) {
        this.data = data;
        this.s = s;
    }
}

Resolution

Check that clone() is only redefined in classes that implement java.lang.Cloneable. Check that the default implementation of clone() is only used for classes that have explicitly declared to implement java.lang.Cloneable.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

 

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