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Array - Security hole

Patricia Samuel
Ranch Hand

Joined: Sep 12, 2007
Posts: 300
This is a frequent source of security holes:
// Potential security hole!
public static final Thing[] VALUES = { ... };

These are the lines that i read in effective Java. Please confirm it is because we have made the reference final not the inside things.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41526
    
  53
The VALUES field is final, meaning that you can't assign a different array to it like "VALUES = ...", but the individual elements *can* be reassigned like "VALUES[0] = ...".


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PrasannaKumar Sathiyanantham
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Joined: Nov 12, 2009
Posts: 110
This is similar to C Pointers.

The variable will always point to the particular address in memory only. But the value stored in the address can be changed


To err is human,
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Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19670
    
  18

Two workarounds are:

1) make the array private and create a public static accessor method:

2) use a List:


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subject: Array - Security hole