adb shell

mount  -o remount,rw /system
kill -9 pid
pm disable 
rm xxx
mount -o remount,ro /system
pm uninstall com.qihoo360.mobilesafe

cat /proc/self/mounts
chmod 755 
/system/sbin/
/system/xbin/
/system/bin/

sh -c exec xx
mv /bag /busybox

mount -o remount,rw %s /system

pm enable xxx