Bug 2417368
| Summary: | SELinux is preventing vncsession from 'getattr' accesses on the filesystem /. | ||||||||
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| Product: | [Fedora] Fedora | Reporter: | Tim Bingham <bingham.tim> | ||||||
| Component: | tigervnc | Assignee: | Jan Grulich <jgrulich> | ||||||
| Status: | ASSIGNED --- | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
| Severity: | unspecified | Docs Contact: | |||||||
| Priority: | unspecified | ||||||||
| Version: | 43 | CC: | alsik, bingham.tim, jgrulich, y9t7sypezp, zpytela | ||||||
| Target Milestone: | --- | Flags: | bingham.tim:
needinfo-
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| Target Release: | --- | ||||||||
| Hardware: | x86_64 | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | abrt_hash:1a45581b4669568169ac57f7a686e2ae986634686086d1119c765b39bb30b60c;VARIANT_ID=kde; | ||||||||
| Fixed In Version: | Doc Type: | --- | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | Type: | --- | |||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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Created attachment 2116268 [details]
File: description
Created attachment 2116269 [details]
File: os_info
Hi, can you share how did you setup and run your VNC session? I have same issue. The problem is well described here: https://discussion.fedoraproject.org/t/problems-with-systemd-in-vncserver-lxqt-session-with-f43/172485 > Hi, can you share how did you setup and run your VNC session?
I set up vnc on Fedora 41 or 42 and it worked without issue until I upgraded to 43 when this vc denial started.
Here are the notes I made when setting up vnc -
Install server
$ sudo dnf install tigervnc-server
$ sudo dnf install plasma-workspace-x11
Install a client
$ sudo dnf install remmina
Add a mapping for user 'abc' to /etc/tigervnc/vncserver.users
$ diff /etc/tigervnc/vncserver.users.original /etc/tigervnc/vncserver.users
...
> :1=abc
$
Create a password
$ vncpasswd
Password:
Verify:
Would you like to enter a view-only password (y/n)? n
$
Create a vnc configuration file on the server (session=<name> where
/usr/share/xsessions/<name>.desktop exists)
Configuration file may be .vnc/config or .config/tigervnc/config
$ cat .vnc/config
session=plasmax11
geometry=1920x1200
$
Open ports in firewall
$ sudo firewall-cmd --add-service=vnc-server --permanent
$ sudo firewall-cmd --reload
Enable and start vncserver
$ sudo systemctl enable vncserver@:1.service
$ sudo systemctl start vncserver@:1.service
Connect from client using remmina as user 'abc' to server:1
Hi @zpytela, can you think of any change in selinux-policy that would be causing this issue for Tigervnc now in Fedora 43? I can only guess some library started to use the pidfs abstraction. fs_getattr_pidfs(vnc_session_t) may be sufficient I made a scratch build with the proposed change from @zpytela. Can you please give it a try? Link: https://koji.fedoraproject.org/koji/taskinfo?taskID=139618090 Refreshed scratch build: https://koji.fedoraproject.org/koji/taskinfo?taskID=140267796 *** Bug 2483765 has been marked as a duplicate of this bug. *** |
Description of problem: SELinux is preventing vncsession from 'getattr' accesses on the filesystem /. ***** Plugin catchall (100. confidence) suggests ************************** If you believe that vncsession should be allowed getattr access on the filesystem by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # ausearch -c 'vncsession' --raw | audit2allow -M my-vncsession # semodule -X 300 -i my-vncsession.pp Additional Information: Source Context system_u:system_r:vnc_session_t:s0 Target Context system_u:object_r:pidfs_t:s0 Target Objects / [ filesystem ] Source vncsession Source Path vncsession Port <Unknown> Host (removed) Source RPM Packages Target RPM Packages SELinux Policy RPM selinux-policy-targeted-42.16-1.fc43.noarch Local Policy RPM tigervnc-selinux-1.15.0-7.fc43.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 6.17.8-300.fc43.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Nov 14 01:47:12 UTC 2025 x86_64 Alert Count 26 First Seen 2025-11-03 12:47:36 EST Last Seen 2025-11-25 21:35:23 EST Local ID 21369545-1850-4a3b-9b9c-ca922f4e03d1 Raw Audit Messages type=AVC msg=audit(1764124523.828:135): avc: denied { getattr } for pid=1225 comm="vncsession" name="/" dev="pidfs" ino=1 scontext=system_u:system_r:vnc_session_t:s0 tcontext=system_u:object_r:pidfs_t:s0 tclass=filesystem permissive=0 Hash: vncsession,vnc_session_t,pidfs_t,filesystem,getattr Version-Release number of selected component: selinux-policy-targeted-42.16-1.fc43.noarch Additional info: reporter: libreport-2.17.15 reason: SELinux is preventing vncsession from 'getattr' accesses on the filesystem /. package: selinux-policy-targeted-42.16-1.fc43.noarch component: tigervnc hashmarkername: setroubleshoot type: libreport kernel: 6.17.8-300.fc43.x86_64 component: tigervnc