[Wayland-bugs] [Bug 84817] New: Allowing a second user running on a WAYLAND_DISPLAY requires the second user to have full permissions to XDG_RUNTIME_DIR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84817

            Bug ID: 84817
           Summary: Allowing a second user running on a WAYLAND_DISPLAY
                    requires the second user to have full permissions to
                    XDG_RUNTIME_DIR
           Product: Wayland
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: wayland
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: nerdopolis1 at verizon.net

Theoretically, I should be able to give the second user just execute
permissions to the XDG_RUNTIME_DIR with setfacl, (with that the user can only
access files in the folder if the name is known, such as WAYLAND_DISPLAY)

However, right now, due to the creation of shared memory files in
XDG_RUNTIME_DIR, it fails to create the shm files, and many clients crash,
forcing the requirement to have full permissions to XDG_RUNTIME_DIR for the
user

It has been suggested that it should fall back to /dev/shm, and /tmp if it is
impossible to write the SHM files to XDG_RUNTIME_DIR on the irc.

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