MrRoth MrRoth - 11 months ago 82
Linux Question

Android mount the filesystem with write permission

The Android device I am using does not hold

on it, so i thought to
it to the device after
ing it from the AVD.

I had no problem pulling it from the AVD, though I cannot push it to the device since I need to enable a write permission. I tried to follow sqlite3: not found

I tried the following

$ adb -d shell
$ mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,relatime,mode=111 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
none /acct cgroup rw,relatime,cpuacct 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/usb tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /app-cache tmpfs rw,relatime,size=7168k 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
/dev/block/mmcblk0p9 /system ext4 ro,relatime,barrier=1,data=ordered 0 0
/dev/block/mmcblk0p7 /cache ext4 rw,nosuid,nodev,noatime,barrier=1,data=ordered
/dev/block/mmcblk0p1 /efs ext4 rw,nosuid,nodev,noatime,barrier=1,data=ordered 0
nil /sys/kernel/debug debugfs rw,relatime 0 0
/dev/block/mmcblk0p10 /data ext4 rw,nosuid,nodev,noatime,barrier=1,data=ordered,
/dev/block/mmcblk0p4 /mnt/.lfs j4fs rw,relatime 0 0
/dev/block/vold/179:11 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,noatime,n
epage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro,discard 0

I followed this link and tried to mount the filesystem as follows but I got a permission error.

$ mount -o rw,remount -t yaffs2 /dev/block/mmcblk0p9 /system
mount: Operation not permitted

Any clue what is needed to be done in order to
into an Adroid device for debugging reasons?

Answer Source

Solution is simple. To remount a mounted system you need to have root privileges. Do an su. You will enter root mode. Then run the below command. It will work, I did it many a times.

So here are the steps:

 adb shell 
 mount -o rw,remount /system

Edit: Found a better solution

From host machine(Linux or windows PC), execute the following commands.

>> adb root
>> adb remount

remount will by default remount the /system partition with rw, if you have the permissions.

Note 1: To execute the commands su or adb root, your device must be rooted and have su executable on it. If the command su is successful, terminal prompt will change from $ to #.

Note 2: In recent mobiles, Security has been tightened, and even after rooting the phone, adb remount wouldn't work. As of i know, there is no solution available for it so far.