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I'm mounting an external exFat drive on a rooted Android device (Amazon Fire TV/2) using the mount.exfat-fuse program. 

mount.exfat-fuse -o rw,umask=000 /dev/block/sda1 /system/test

directory permissions are 777, but permission denied for anything root tries.

Thanks for any help.

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    /system is read-only by default, could be related. It's certainly not a good place to be mounting external drives.
    – Matthew Read
    Commented Nov 23, 2015 at 20:24
  • system was mounted r/w and the location was just for easy testing of a script in xbin, but thanks for the replies.
    – Jocala
    Commented Nov 23, 2015 at 23:00

1 Answer 1

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It turned out that SELinux policy on the Amazon Fire TV/2 caused my exFat drive to be read-only when mounted, despite mounting arguments. The SELinux command setenforce can be run with an argument of 0 or 1, setting SELinux to permissive or enforced, respectively. When set to 0, the drive can be used normally.

So, I check for the presence of setenforce in my mount script and set it to 0 if found. The unmounting script does setenforce 1, putting things back as they were.

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  • can you please post a more detailed answer ,so it can be useful as a future reference :) thanks in advance
    – Rachid Boudjelida
    Commented Nov 23, 2015 at 23:24
  • Sure. I hope this helps someone else.
    – Jocala
    Commented Nov 24, 2015 at 1:23

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