Bug 248771
| Summary: | DBus session bus autostart script fails to close open file handles | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Daniel Berrangé <berrange> |
| Component: | dbus | Assignee: | David Zeuthen <davidz> |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 7 | CC: | mclasen, triage |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2008-06-17 01:54:29 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 248775 | ||
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Description of problem: If you have an application which tries to connect to the session bus, but there is no bus running, the DBus libraries will try to automatically start one. This appears to be done by spawning dbus-launch. Unfortunately the code does not appear to close all open file handles after fork()'ing. So the DBus daemon inherits all open file handles from the application. This results in all sorts of very serious badness depending on what the parent app had open. eg, one app I've hit this with has a number of files open, but deleted - the intention being that when the app exits all the files are cleaned up. THis never happens because the auto-spawned daemon keeps the files open. The current problem is hitting virt-manager - it has a VNC connection open to a Xen guest - the DBus daemon inherits this socket file handle so blocks *anyone* else ever connecting to that guest again. Version-Release number of selected component (if applicable): dbus-1.0.2-6.fc7 How reproducible: Always Steps to Reproduce: 1. ssh root@some-remote-host 2. Make sure no dbus session bus is running 3. # cat > dbus-demo.py <<EOF #!/usr/bin/python log = open("/tmp/demo.log", "w") import dbus import dbus.glib bus = dbus.SessionBus() EOF 4. DBUSPID=`ps auxwf | grep dbus-daemon | grep session | awk '{print $2}'` 4. lsof -p $DBUSPID Actual results: The dbus daemon has '/tmp/demo.log' open Expected results: The dbus daemon has *no* files open from the parent process. Additional info: After forking, the code which autolaunchs the daemon needs to open_max = sysconf (_SC_OPEN_MAX); for (i = 0; i < open_max; i++) close(i); And then re-open stdin, stdout & stderr to use /dev/null.