I want to use a script to backup and restore my wifi settings and email accounts after a ROM flash.
In the script I use this command to make system R/W to be able to replace EmailProvider.db in data/data/com.android.email/databases/ :
Code:
mount -o remount,rw /dev/block/mtdblock3 /system
Then I reboot, but ALL files (including /system) stay R/W after reboot.
Also when I add this to end of the script, all stays RW:
Code:
mount -o remount,ro /dev/block/mtdblock3 /system
Is this normal?
Should I (and how can I) remount the system RO after excucuting the restore script?
(all above is done in adb shell su, to test before executing script on sgs2)
ROM: own custom ROM made in Ubuntu based on XWKI4
Kernel: stock XWKI4
busybox 1.18.6
su: 2.3.6.3
SuperUser: 2.3.6.3
Click to expand...
Click to collapse
Nevermind,
found the answer:
the /system is remounted RO after the command, but not /data.
And it was in /data/data/com.android.email/databases/ that I made the changes and where it seems to stay RW.
So the data partition is RW just after flashing and stays RW...
Related
Hello all,
I am trying to push a file to my system, however I do not seem to be able to mount my system partition.
When I try to execute the following command, I always get the error "Operation not permitted" :
Code:
adb shell mount -o remount,rw -t yaffs2 /dev/block/mtdblock2 /system
My phone is rooted and my USB debugging is on !!
Anyone no what could cause this. It has always worked when I was still on 1.6 (rooted) and now it doesn't allow me access.
When I use Rootexplorer, I have R/W access, so root works.
Anyone has any tips or advise ?
Try...
adb shell
su
mount -o remount,rw -t yaffs2 /dev/block/mtdblock2 /system
Tried that, and get permission denied
Should have added, make sure your screens on on the phone and allow SuperUser access when you type su.
never mind, one sec
So I'm totally unable to do anything to my /system in CWM via ADB.
Code:
> adb remount
remount failed: Operation not permitted
> adb push item.apk /system/app/item.apk
Failed: Permission denied
adb shell
$: su
Segmentation fault
$: rootsh
~# mount /system
mount: mounting /dev/block/mmcblk0p9 on /system failed: Device or resource busy
~# su
# mount /system
mount: mounting /dev/block/mmcblk0p9 on /system failed: Device or resource busy
# mount /system/app
can't find /system/app in /etc/fstab/
Pressing "unmount /system" in CWM results in "Error unmounting /system!" message. I tried pressing "Fix Permissions" but it didn't help. The only thing it did was that "su" results in "Segmentation fault" instead of "Permission denied". I just flashed my Lite'nin ROM again but it didn't fix anything.
I do have root access in normal OS so I can probably do some stuff in terminal emulator. But why is /system busy all the time?
try this:
adb shell
$ su
# mount -o rw,remount -t yaffs2 /dev/block/mmcblk0p9
kaukassus said:
try this:
adb shell
$ su
# mount -o rw,remount -t yaffs2 /dev/block/mmcblk0p9
Click to expand...
Click to collapse
Thanks. That apparently mounted the /system but adb was still unable to push the files there. Maybe that is because "su" is still not working, only "rootsh". So I moved the file to my sdcard and then moved it to /system in shell.
Jiia said:
Thanks. That apparently mounted the /system but adb was still unable to push the files there. Maybe that is because "su" is still not working, only "rootsh". So I moved the file to my sdcard and then moved it to /system in shell.
Click to expand...
Click to collapse
since you are using a Secured Kernel(probably the CF-Root with CWM), you have to push the files to /sdcard
and then copy the files from the sdcard to the /system directory.
you can only push files with adb directly to the /system directory, when you are using an insecured kernel.
kaukassus said:
since you are using a Secured Kernel(probably the CF-Root with CWM), you have to push the files to /sdcard
and then copy the files from the sdcard to the /system directory.
you can only push files with adb directly to the /system directory, when you are using an insecured kernel.
Click to expand...
Click to collapse
Oh. Thanks for the info, that cleared things up! I thought you only need to have a custom recovery in order to push with adb but apparently it's about the kernel.
kaukassus said:
try this:
adb shell
$ su
# mount -o rw,remount -t yaffs2 /dev/block/mmcblk0p9
Click to expand...
Click to collapse
this not working for me ,still can't mount the system i can't rm9 at ADB at all please help me !
I have an Acer A210 and have modified the boot.img to have ro.secure=0 and ADB root. Then I had to mount the /system partition but that is not so easy:
Code:
C:\>adb shell
[email protected]:/ # mount -o remount,rw /system
mount -o remount,rw /system
mount: Operation not permitted
C:\>adb push busybox /data/local/tmp
1065 KB/s (777216 bytes in 0.712s)
126|[email protected]:/data/local/tmp # chmod 755 busybox
chmod 755 busybox
[email protected]:/data/local/tmp # ./busybox mount -o remount,rw /system
./busybox mount -o remount,rw /system
mount: permission denied (are you root?)
Currently the only way to mount /system rw is this:
Code:
cd /system/xbin/
mount -o remount,rw /dev/block/platform/sdhci-tegra.3/by-name/APP /system/
So now I have root (pushed su and busybox from A510 and installed SuperUser from ChainsDD) but installed applications that want to mount /system rw cannot do that. I think because of the mounting problem. Also a custom CWM 6.0.1.4 cannot mount /sdcard but it works with ADB.
Thanks for help with that!
MaluNoPeleke said:
So now I have root (pushed su and busybox from A510 and installed SuperUser from ChainsDD) but installed applications that want to mount /system rw cannot do that. I think because of the mounting problem. Also a custom CWM 6.0.1.4 cannot mount /sdcard but it works with ADB.
Thanks for help with that!
Click to expand...
Click to collapse
Acer implemented in kernel "system RW protection" (I don't know how to call that)- kernel prohibits such operations. Only workaround is compiling a custom kernel with this feature disabled.
As for recovery- check /etc/fstab if sdcard mountpoint (stored in init.rc or init.[device name].rc) matches the one recovery uses (/etc/fstab)
Thanks for that! Is it hard to disable the system rw security in the kernel? I haven't done that before. Is there a tutorial from another Acer tablet?
How can I check the fstab content in the recovery? It was built by the recovery builder.
Thanks!
MaluNoPeleke said:
Thanks for that! Is it hard to disable the system rw security in the kernel? I haven't done that before. Is there a tutorial from another Acer tablet?
Click to expand...
Click to collapse
It's a kernel config option only, for a510 it's CONFIG_ACER_SECURE_MOUNT and it is accessible in menuconfig or by hand- in .config change "CONFIG_ACER_SECURE_MOUNT=yes" to "# CONFIG_ACER_SECURE_MOUNT is not set" (as for kernel compilation- there are many tutorials floating around)
MaluNoPeleke said:
How can I check the fstab content in the recovery? It was built by the recovery builder.
Click to expand...
Click to collapse
Start recovery and just
Code:
adb shell
cat /etc/fstab
or
Code:
adb pull /etc/fstab [path on your pc]
I've never used any recovery builder but kernel and ramdisk/initramfs (where recovery is placed) are separate files, you can unpack boot.img and just modify what you need (note- linux machine required, virtual one will do)
Is it already disabled in the source code?
Code:
[email protected] ~/Dokumente/kernel $ grep -R -i 'CONFIG_ACER_SECURE_MOUNT*' ./*
./arch/arm/configs/picasso_mf_defconfig:# CONFIG_ACER_SECURE_MOUNT is not set
./arch/arm/configs/picasso_m_defconfig:# CONFIG_ACER_SECURE_MOUNT is not set
./arch/arm/configs/picasso_e_defconfig:# CONFIG_ACER_SECURE_MOUNT is not set
./arch/arm/configs/picasso_e2_defconfig:# CONFIG_ACER_SECURE_MOUNT is not set
./arch/arm/configs/picasso2_defconfig:# CONFIG_ACER_SECURE_MOUNT is not set
./fs/Makefile:ifeq ($(CONFIG_ACER_SECURE_MOUNT),y)
It seems that it's disabled.
Is there a zip file for Acer 210 tablet now 4/2013
dobie62 said:
Is there a zip file for Acer 210 tablet now 4/2013
Click to expand...
Click to collapse
There is a real lot available for A210:
Pure root (German)
CWM recovery (German)
Custom Kernel
CM 10.1 like ROM
What are you looking for?
regards Uwe
This is it but in English please.
A210
Are the A210 and the A510 similar enough to use the same kernel, ROM's or Recovery?
No app can mount system as rw, even mount -o rw,remount /system doesn't work
Only adb remount works.
@Chainfire
SuperSU zip broken root at all
Its been updated .
I want move my app to /system/app/, I did follow steps under ROOT privilege
Code:
mount -o remount,rw /system /system
cat /data/local/tmp/abc.apk > /system/app/abc.apk
chmod 644 /system/app/abc.apk
mount -o remount,ro /system /system
reboot
but the abc.apk file disappear from /system/app after reboot.
if I use update.zip package under Recovery mode to write the abc.apk to /system/app, it will be normal after reboot.
so, what's the difference for wrinting system partition under Recovery mode and ROOT privilege?
Thank you very much!