Using Tracking Bugs
Handling tracking bugs in Bugzilla
Let's imagine a situation where a security flaw was found in yoyodine package. A member of Fedora Security Response team enters it in bugzilla under Security Response Team. Then he requests a CVE identifier for the issue. As he found the mention of the bug while reading a public mailing list, he creates a public bug. When he gets the CVE for the bug, he adds it to the begining of the Summary line and sets an appropriate alias=CVE number.
- Parent bug is entered in the Security Response product
- Parent bug's subject begins with the CVE
- Parent bug is publicly viewable
- Parent bug has an alias=CVE
- Parent bug is assigned to the Fedora Security Response team
- Parent bug has a Security keyword set
As the bug obviously affects yoyodine package, he triages it and finds that it affects all supported Fedora releases, and also EPEL. He creates appropriate tracking bugs (with a script). Later it is found out that the vulnerable code is reused in foobar package that is present in EPEL5 (common situation with xpdf code). He adds appropriate tracking bug.
- Tracking bug belongs to Fedora Project Contributors group
- Tracking bug is depended on by the Parent bug
- Tracking bug is entered into respective Product/Component/Version where the flaw needs to be addresed
- Tracking bug is assigned to the developer
- The description of the tracking bug doesn't contain information about the flaw, but rather refers to the Parent bug and describes how to handle the flaw
- Tracking bug has a Security keyword set
The situation then looks like this:
(public, alias=CVE-2007-9999) |- #111111: CVE-2007-4631 Yoyodine stack overflow via a long do_nothing() argument [rawhide] | (group Fedora Project Contributors, component=yoyodine) |- #222222: CVE-2007-4631 Yoyodine stack overflow via a long do_nothing() argument [F15] | (group Fedora Project Contributors, component=yoyodine) |- #333333: CVE-2007-4631 Yoyodine stack overflow via a long do_nothing() argument [F14] | (group Fedora Project Contributors, component=yoyodine) |- #444444: CVE-2007-4631 Yoyodine stack overflow via a long do_nothing() argument [EPEL5] | (group Fedora Project Contributors, component=foobar)
Handling CVEs for maintainers
- for each tracking bug (refers to a single branch)
- if the version in this branch is not affected, close this particular tracking bug
- otherwise commit the fixes and create a new build
- create a new update request in bodhi
- refer to bug the parent *and* the tracking bug
- select "Close bugs when update is stable"
- don't explicitly refer to the CVE from in the "notes" text box, the reference is implicit created by referring both bugs
That's all. The rest will happen automatically.
Handling Tracking bugs in bodhi
Bodhi is able to identify if a bug is a tracking bug and doesn't include it in the new package announce mail. Bodhi closes the tracking bug, and in case all other bugs that Parent depends on it also closes the Parent. To keep track, Bodhi adds comments to both Parent and Tracking bug.
- Bodhi shouldn't include the bug belonging to Fedora Project Contributors in the mail (Note: Wouldn't it be better to identify a tracking bug with a dedicated keyword rather than group membership?)
- Bodhi should close the bug only in case all bugs it depends on are closed and it is not in NEW state
- Bodhi should include the Summary of the bugzillas rather than just the number, so that reference to CVE is visible in the mail
- Bodhi should add comments to the bugs when the update is created, and pushed to testing, not just when it gets live. (This would save the SRT from unnecessary pings to developers and keep users updated)
The References section in update announce mails is changed from:
References: [ 1 ] Bug #284511 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=284511 [ 2 ] CVE-2007-4727 http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4727
References: [ 1 ] CVE-2007-4727 FastCGI header overrun in lighttpd's mod_fastcgi https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=284511