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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 35742] New: - segfaults with bogus userdirs
Date Thu, 14 Jul 2005 15:44:51 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=35742

           Summary: segfaults with bogus userdirs
           Product: Apache httpd-2.0
           Version: 2.0.54
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_userdir
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: apache@ser1.net


In short, httpd processes handling "~foo" (userdir) requests segfault if the  
user is invalid.  The log message on the server is:  
  
   [notice] child pid 1956 exit signal Segmentation fault (11) 
 
On the client, one gets a connection broken error. 
 
I first noticed this when trying to add a purely LDAP user -- IE, 
no /etc/passwd entry.  That addition worked fine; I could log in with ssh, get 
useful results from getent, su to the user, etc; but hitting 
http://myserver.com/~user caused the aforementioned segfault.  Adding the user 
to /etc/passwd fixed the problem; out of curiosity, I tried accessing 
"http://myserver.com/~foo" (where "foo" is in neither /etc/password nor LDAP) 
and got the same segfault -- so I don't think it has to do with LDAP in 
particular, but rather that mod_userdir can't resolve the user directory.  I 
would expect an error, but a segfault doesn't seem like appropriate behavior. 
 
As an aside, even if this is fixed, I wonder why mod_userdir can't locate 
directories for LDAP-only users.  Does mod_userdir go to /etc/passwd directly, 
rather than using getent or other NSS API? 
 
--- SER

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