[Bug 768] PAM address space

[bugzilla-daemon at mindrot.org]

http://bugzilla.mindrot.org/show_bug.cgi?id=768

           Summary: PAM address space
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: PAM support
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: christian.huettig at desy.de


The bug lies in your auth-pam.c, where you use the fork() replacement for the 
posix thread mechanisms. It seems that you never check for their availability 
and therefore never use it. 
The problem is that a pam module may be called several times, and some pam 
modules (pam_krb5* for example) rely on the fact that it can give informations 
to further calls, may it be through pam_set(/get)data or the pam environment. 
Since the pam_xx calls get called from different (forked) pids, it looses the 
address space and as a result all pam informations get lost. A force of the 
posix thread system (#define USE_POSIX_THREADS) solves that problem since the 
created thread operates in the same address space.



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