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Android with linux kernel is on its way to be a standard platform of various smart devices. Therefore, Android platform based linux kernel rootkit will be a major security threat to smart phones, tablet PCs, smart TVs and so on. Although there is an urgent need of remedy for this threat, no solution or even a suitable study has been announced. In this paper, we are going to depict some rootkits which exploit android kernel by taking advantage of LKM(loadable kernel module) and /dev/kmem device access technology and discuss the danger the rootkit attack would bring.