If FIXME: option name is enabled, instance directory names are created using the MD5 hash algorithm. AFAICS from a quick look, create_instance() doesn't do any collision checking, it "takes over" any previous instance. Even if the above is correct, exploiting it would probably require user-controlled user or SELinux context names.
Oops, s/FIXME: option name/gen_hash/
I don't think there is any real security weakness coming from this as you can remove the word 'probably' from the sentence above as the user doesn't have a control over anything that is being hashed.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle. Changing version to '11'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
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Still the same in pam-1.1.3-8.fc15.
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Bug still exists in pam-1.1.5-8.fc18.src.rpm
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
We are not going to pursue this RFE at this point. If anyone wishes to work on this I'd suggest creating pull request on linux-pam upstream. https://github.com/linux-pam/linux-pam