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eridani
Asked: 2016-08-05 20:33:57 +0800 CST

Mount disk image for all users, even guest [duplicate]

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What is the correct way to mount a disk image so all users (guest included) are able to access it?

I'm currently stuck after mounting it with:

sudo mount -o loop,users,ro,offset=262145048576 '/path/Disk Image.img' '/media/guest-Folder/Disk'

My normal user session can access it, but on a guest session I get an error: "This location could not be displayed. You don't have the permissions necessary to view the contents of Disk" while trying to view the contents in Nautilus.

mount

1 Answers

  1. The guest session is prevented to access it because of the default AppArmor setting. One way to fix it should be to open this file for editing:

    sudo nano /etc/apparmor.d/abstractions/lightdm

    find these lines:

    owner /{,run/}media/ r,
owner /{,run/}media/** rmwlixk,  # we want access to USB sticks and the like

    and remove the owner keyword so it looks like:

    /{,run/}media/ r,
/{,run/}media/** rmwlixk,  # we want access to USB sticks and the like

    But that would give the guest users access to all mounted stuff, which would defeat the security scheme. So I would rather add a new rule, so it looks something like this:

    /{,run/}media/ r,
owner /{,run/}media/** rmwlixk,  # we want access to USB sticks and the like
/media/guest-** rmwlixk,
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