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Now the CorruptString class can be referenced by a Java program, which can use it to attempt to corrupt any string that it has a reference to. Even though the program will run with the original version of the String class, the CorruptString class will be able to access the private value array within the String class −− unless the bytecode verifier rejects the CorruptString class. 1 Inside the bytecode verifier The bytecode verifier is an internal part of the Java virtual machine and has no interface: programmers cannot access it and users cannot interact with it.
This gives us the best of both worlds −− verification of the access is performed during the actual running of the program (after traditional bytecode verification has occurred), but the verification is still only performed once (unlike the runtime verification we'll examine later). 3 Runtime Enforcement Like the compiler, the bytecode verifier cannot completely guarantee that the bytecodes follow all of the rules we outlined earlier in this chapter: it can only ensure that the first four of them are followed.
Most implementations, including the appletviewer and the Java Plug−in, set up a separate event queue for each applet codebase. This means that an applet can use the methods of the event queue class to access its own event queue; the accessEventQueue permission does not need to be granted in that case. However, if you install the sandbox via a command−line argument, then this does not apply, and your code will need this permission in order to call methods of the event queue class. All applications still need the listenToAllAWTEvents permission in order to register an event listener with the default toolkit.
Java Security, Second Edition Scott Oaks
by Thomas
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