[Security Policy]��

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#19076

From: ��˼�
Date: Tue, 13 Jan 2004 04:42

55 lines
3060 bytes

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//mypolicy.cfg

grant codeBase "file:/home/tcma/test/super/*" {
    permission java.security.AllPermission;
}

Ȼ����superĿ¼��д��һ����SuperClass

//SuperClass.java
..
public static void main(String args[]){
    (new SuperClass()).test();
}
..
����test()��һ����Ա��������ļ�"sss"��һ���ļ������������дһ������
���룬���У�ͨ����Ϊ��Ȩ����

Ȼ����super�ĸ�Ŀ¼��д����һ����NonSuperClass�����ǿ�����SuperClass.java
Ȼ������е�SuperClass�滻��NonSuperClass�����룬����
��Ȼ���׳��쳣����Ϊû��Ȩ�ޣ����£�

java.security.AccessControlException: access denied (java.io.FilePermission
sss write)
        at ....
..
        at NonSuperClass.test(NonSuperClass.java:10)
        at NonSuperClass.main(NonSuperClass.java:17)

�����ﶼ�ǶԵġ�Ȼ�����޸���NonSuperClass.java���������
    (new NonSuperClass()).test();
�ĳ���
    (new SuperClass()).test();
Ȼ�����
javac NonSuperClass.java super/SuperClass.java
Ȼ������ NonSuperClass
�����FilePermission�׳��쳣

....
        at SuperClass.test(SuperClass.java:10)
        at NonSuperClass.main(NonSuperClass.java:17)

����SuperClass��codeBase��superĿ¼����ΪʲôҲû��Ȩ�����أ�

--

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From: swear.bbs@freecity.cnzju.net (���˼�)
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Subject: [Security Policy]��
Date: 13 Jan 2004 04:42:46 GMT
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