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Half Life Ultimate Edition 7 Could Not Load Library Client
Library code can be carefully written such that it is safely usable by less trusted code. Libraries require a level of trust at least equal to the code it is used by in order not to violate the integrity of the client code. Containers should ensure that less trusted code is not able to replace more trusted library code and does not have package-private access. Both restrictions are typically enforced by using a separate class loader instance, the library class loader a parent of the application class loader.
Java PlugIn and Java WebStart isolate certain global state within an AppContext1. Often no security permissions are necessary to access this state, so it cannot be trusted (other than for Same Origin Policy within PlugIn and WebStart). While there are security checks, the state is still intended to remain within the context. Objects retrieved directly or indirectly from the AppContext should therefore not be stored in other variations of globals, such as plain statics of classes in a shared class loader. Any library code directly or indirectly using AppContext on behalf of an application should be clearly documented. Users of AppContext include:
For example, System.loadLibrary("/com/foo/MyLib.so") uses the immediate caller's class loader to find and load the specified library. (Loading libraries enables a caller to make native method invocations.) Do not invoke this method on behalf of untrusted code, since untrusted code may not have the ability to load the same library using its own class loader instance. Do not invoke any of these methods using inputs provided by untrusted code, and do not propagate objects that are returned by these methods back to untrusted code.
The System.loadLibrary("/com/foo/MyLib.so") method uses the immediate caller's class loader to find and load the specified native library. Loading libraries enables a caller to invoke native methods. Therefore, do not invoke loadLibrary in a trusted library on behalf of untrusted code, since untrusted code may not have the ability to load the same library using its own class loader instance (see Guidelines 9-8 and 9-9 for additional information). Avoid placing a loadLibrary call in a privileged block, as this would allow untrusted callers to directly trigger native library initializations. Instead, require a policy with the loadLibrary permission granted. As mentioned earlier, parameter validation should also be performed, and loadLibrary should not be invoked using input provided by untrusted code. Objects that are returned by native methods should not be handed back to untrusted code.
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