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Bug 1969317 - various commands failing to access fuse.portal filesystems [rhel-9]
Summary: various commands failing to access fuse.portal filesystems [rhel-9]
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: coreutils
Version: 9.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: beta
: 9.0 Beta
Assignee: Kamil Dudka
QA Contact: Vojtech Eichler
URL:
Whiteboard:
Depends On: 1913358
Blocks: 1952714
TreeView+ depends on / blocked
 
Reported: 2021-06-08 07:57 UTC by Kamil Dudka
Modified: 2021-12-07 21:48 UTC (History)
3 users (show)

Fixed In Version: coreutils-8.32-27.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1952714
Environment:
Last Closed: 2021-12-07 21:44:43 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Kamil Dudka 2021-06-08 07:57:26 UTC 
+++ This bug was initially created as a clone of Bug #1952714 +++

Description of problem:
fuse.portal is not marked as a dummy fs, so various utilities fail with EPERM when attempting to read them. 

How reproducible:
Always

Steps to reproduce error:
$ systemctl start --user xdg-document-portal   # Make sure xdg-document-portal is running.
# find /run/user/1000/doc -ignore_readdir_race -xdev -type f
find: ‘/run/user/1000/doc’: Permission denied

Temporary workaround:
$ systemctl mask --user xdg-document-portal

Actual results:
Permission denied

Expected results:
find, and other utilities should not attempt to access fuse.portal filesystems. 

Additional info:
Issue is not limited to find, but find is the specific example provided in this instance. Upstream discussions are more towards df, and the fix seems to be marking fuse.portal as squashfs

Several upstream discussions of this:

df (and other commands) fail on /root/.cache/doc · Issue #512 · flatpak/xdg-desktop-portal · GitHub
https://github.com/flatpak/xdg-desktop-portal/issues/512

mountlist.c: Define fuse.portal mounts as dummy by dbonner · Pull Request #11 · coreutils/gnulib · GitHub
https://github.com/coreutils/gnulib/pull/11

Suggested fix to mountlist.c: Define fuse.portal, devtmpfs and squashfs
https://lists.gnu.org/archive/html/bug-gnulib/2021-02/msg00053.html

--- Additional comment from Kamil Dudka on 2021-04-23 10:57:27 CEST ---

Thank you for filing the bug!  This was previously reported on Fedora:

    bug #1913358
Comment 1 Kamil Dudka 2021-06-09 08:53:51 UTC 
Reproducer:

# yum install -y xdg-desktop-portal
# systemctl --user start xdg-document-portal.service
# mount | grep portal
portal on /run/user/0/doc type fuse.portal (rw,nosuid,nodev,relatime,user_id=0,group_id=0)

# df > /dev/null
df: /run/user/0/doc: Operation not permitted
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