命令号下输入：
#adb shell
#mount终端输出结果：
127|root@rk3288:/ # mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,seclabel,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,seclabel,relatime 0 0
selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
none /sys/fs/cgroup tmpfs rw,seclabel,relatime,mode=750,gid=1000 0 0
none /sys/fs/cgroup/memory cgroup rw,relatime,memory 0 0
tmpfs /mnt/secure tmpfs rw,seclabel,relatime,mode=700 0 0
tmpfs /mnt/asec tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
adb /dev/usb-ffs/adb functionfs rw,relatime 0 0
/dev/block/platform/ff0f0000.rksdmmc/by-name/system /system ext4 ro,seclabel,noatime,nodiratime,noauto_da_alloc,data=ordered 0 0
/dev/block/platform/ff0f0000.rksdmmc/by-name/cache /cache ext4 rw,seclabel,nosuid,nodev,noatime,nodiratime,discard,noauto_da_alloc,data=ordered 0 0
/dev/block/platform/ff0f0000.rksdmmc/by-name/metadata /metadata ext4 rw,seclabel,nosuid,nodev,noatime,nodiratime,discard,noauto_da_alloc,data=ordered 0 0
/dev/block/platform/ff0f0000.rksdmmc/by-name/userdata /data ext4 rw,seclabel,nosuid,nodev,noatime,nodiratime,discard,noauto_da_alloc,data=ordered 0 0
/dev/block/platform/ff0f0000.rksdmmc/by-name/oem /oem ext4 rw,seclabel,nosuid,nodev,noatime,nodiratime,discard,noauto_da_alloc,data=ordered 0 0
/sys/kernel/debug /sys/kernel/debug debugfs rw,relatime,mode=755 0 0
/dev/fuse /mnt/shell/emulated fuse rw,nosuid,nodev,relatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0
/dev/block/vold/179:15 /mnt/internal_sd vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0002,dmask=0002,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/179:15 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0002,dmask=0002,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0大家仔细看会发现这样一句话：
/dev/block/platform/ff0f0000.rksdmmc/by-name/system /system ext4 ro,seclabel,noatime,nodiratime,noauto_da_alloc,data=ordered 0 0可以看到system是以只读权限挂载的（其中的ro就代表只读Read Only）.
下面如何操作呢？
输入：（这一步是重点）
#mount -o remount -o rw /system然后查看修改后的结果
/dev/block/platform/ff0f0000.rksdmmc/by-name/system /system ext4 rw,seclabel,relatime,noauto_da_alloc,data=ordered 0 0你会发现system的权限已经被修改成了可读写。