Comments (6)
补充下,test2中的my_test_add函数:
static void my_test_add(int a,int b){
__android_log_print(ANDROID_LOG_ERROR, "XHOOK====>> before ","a=%d ,b=%d", a,b);
a=200;
__android_log_print(ANDROID_LOG_ERROR, "XHOOK====>> after ","a=%d ,b=%d", a,b);
ori_testadd(a,b);
}
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你的意思是app中hook第一个点能成功,再加一个点就失败了?
你需要在调用xhook_refresh之前一次性注册完所有的hook点(用xhook_register),一旦调用过xhook_refresh之后,就不能调用xhook_register了(如果调用会有警告输出)。
这么设计主要是性能方面的考虑,xhook内部会维护一个map,用于记录所有注册的hook点、已hook成功的点、当前进程加载的so列表等信息,避免在下次调用xhook_refresh时执行重复的不必要的hook。
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我没完全表述清楚,不好意思。test1和test2是两个不同的app,test1主要是我用来测试是否支持hook自身模块内函数功能,也是就Hook test_add函数。test1测试的时候是可以的。然后我把这个功能用在我的test2上,test2是我的app,测试hook tt_add函数,发现不能实现hook。
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xhook只支持PLT/GOT hook方式,即hook调用者so中的对外调用点,不支持对包含目标函数实现的so本身进行hook。可以看下这个:https://github.com/iqiyi/xHook/blob/master/docs/overview/android_plt_hook_overview.zh-CN.md
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谢谢,刚重新分析了,是这样,再次谢谢你的回答 。
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不客气。
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