[Magisk] wstephen:
Test Report Version 2018.3.16

Hi, it took me many days trying to make this fbind work but no luck. My device is:

LG V20 H990DS Android 7.0 (all stock except kernal "DOTS_H990_kernel-leicxan_jahlex-v1.4");

Accessible Internal Storage Paths - (1) "/storage/emulated/0", (2) "/sdcard", and (3) "/data/media/0";

Magisk Version: 16

Magisk Modules Installed:

ExSDCard Access Enabler (so, I have /mnt/media_rw/0F14-04D2 on top of /Storage/0F14-04D2);

Single User Mode (So that the files get transferred from the PC are readable on the device's explorer);

fbind version: 2018.3.16

From_To Method failed. Namespace: Tried "Inherent" & "Global", Terminal feedback:

Subsequent Observations:

1. Only the last From_To line out of the list responded to positively to the "fbind -b" comment, and created a folder under the ExtSD ".fbind" directory.

2. Adding the line "permissive_SELinux" to the first line of the config.txt did not help creating the whole From_To list under the ".fbind" directory in the ExtSD.

3. Tried using only one From_To line at a time, and "fbind -b" did created the full list one after the other. Debug Log did not record anything after executing each single line config.txt.

4. The Terminal command "fbind -u" did unmount all of the From_To list at one go.

5. Tried using this Single Line From_To list to execute "fbind -mb" on WhatsApp. Root Explorer saw only ".backup", and ".trash" but not all the others. The WhatsApp, however, can see all the photos and videos.

6. The File Explorer (Windows 10) can only see ".fbind/WhatsApp/" contains the two dot prefixed folders, but it can see all other media files in " (1) "/storage/emulated/0", (2) "/sdcard", and (3) "/data/media/0". The explorers in the device can only see the WhatsApp folder of 0 bytes (the path to ExtSD). The device had ADB Debug on.

7. New photos were received and properly displayed.

8. Switched "Single User Mode" to off, File Explorer (Windows 10) could not see the WhatsApp folders in "/data/media/0" again.

9. Changed NameSpace to "Inherent Mode" from "Global Mode" and rebooted, the WhatsApp app saw all the photos and video blurred. Pressing on the download arrows returns with "Insufficient Space to download".

10. Issued Terminal Command "fbind -u", the WhatsApp folders in "/data/media/0" have double the amount of photos and videos, but the WhatsApp app only shows a single set. The ".find/WhatsApp" still has the two dot prefixed folders there.

Overall Impression:

I thought it was the syntax in config.txt and I hope someone may help. But, after digging deeper into this mix of config.txt, Single User Mode, NameSpace, I realized that there are somethings else other than the syntax.

Yes, despite of not being able to look into/manipulate these bound folders and files using the device's file explorers, to some extent it works (perhaps for a while). Or, It should have been working if I did not change the environment like Single User Mode and NameSpace after issuing the "fbind -mb" command. I can apparently send and receive media stowed in the ExtSD (though I can't see those files in the file explorer to be very sure these folder were actually bound).

Nonetheless, this is the only way to do away Xposed that fails basic security checks.