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[BUG] encrypted sdcard inaccessible by Android apps

asked 2018-11-03 20:39:04 +0300

sashikknox gravatar image

updated 2018-11-03 22:47:21 +0300

rozgwi gravatar image

I have Jolla C device, and after update, i format my sdcard to encrypted ext4 format (that cool =) ), than recover all sdcard data by rsync from PC. All native apps works nice, but all android apps can't see sdcard. es city guide 2gis

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are you running SFOS

rozgwi ( 2018-11-03 22:48:00 +0300 )edit

yes, its

sashikknox ( 2018-11-03 23:07:01 +0300 )edit

now, when i format sd card to ext4 without encryption , it can open it from android only in /medai/sdcard .. but: image description

sashikknox ( 2018-11-04 10:47:03 +0300 )edit

The error above is correct and expected because of linking in the android's namespace. If one needs to check the android runtime's file system, CWD to /opt/alien which is the runtime's root, i.e.

cd /opt/alien

or set root by

devel-su chroot /opt/alien bash

In this namespace, /storage/sdcard0 is accessible but seems to be the internal storage also seen as /home/nemo/android_storage. However, the filesystem in the luks volume is mounted in the usual place as /run/media/nemo/LABEL and can be accessed when one can select the location.

As it stands, android cannot access the card as a device /dev/mmcblk1p1 when encryption is enabled as this partition does not contain anything similar to a filesystem. It needs to access the already mounted file system under /run/media/nemo/LABEL (or any link pointing to this mountpoint), or bind mount it. I cannot recall exactly but one may need to adjust directory permissions of the mountpoint's path. Hope this helps.

woodenmo ( 2018-11-04 11:47:31 +0300 )edit

ok, later i'll try mount bind, and last screenshot from unecrypted, but ext4 formatted sdcard

sashikknox ( 2018-11-04 13:56:21 +0300 )edit

1 Answer

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answered 2018-11-04 17:00:59 +0300

sashikknox gravatar image

updated 2018-11-04 17:05:16 +0300

before problems are begining, i move android_storage from home to sdcard, and create symlink. now i try to return abdroid_storage to home, and remove symlinc to sdcard, and now android apps work as is. later i'll try encrypt sd again, and test it )

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Asked: 2018-11-03 20:39:04 +0300

Seen: 340 times

Last updated: Nov 04 '18