IBM Support

IV55629: A SYMLINKED CMD WITH TARGET AS HARDLINK MAY FAIL FOR RBAC USER APPLIES TO AIX 7100-03

A fix is available

Obtain the fix for this APAR.

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • An RBAC enabled command may fail while running as an authorized
user under the following condition:  - subject command is
resolved as symbolic link (ex. /etc/pshare is symlink to
/usr/sbin/penable) and target program is hardlink with other
program, ex. /usr/sbin/penable is hardlinked with
/usr/sbin/pshare - in /etc/security/privcmds table,
/usr/sbin/pshare and /usr/sbin/penable specified with different
RBAC attributes (i.e. both entries have different accessauths,
etc.) - The PATH env. variable has /etc before /usr/sbin - When
an authorized user having role to execute the /usr/sbin/pshare,
runs "pshare" cmd, it may fail.  The accessx() is resolving to
incorrect object in above example because vnode is passed for
RBAC verification and hardlink objects have same vnode. The
"type pshare" returns /etc/pshare instead of /usr/sbin/pshare.

Local fix

  • 



Problem summary


    

  • An RBAC enabled command may fail while running as an authorized
user under the following condition:  - subject command is
resolved as symbolic link (ex. /etc/pshare is symlink to
/usr/sbin/penable) and target program is hardlink with other
program, ex. /usr/sbin/penable is hardlinked with
/usr/sbin/pshare - in /etc/security/privcmds table,
/usr/sbin/pshare and /usr/sbin/penable specified with different
RBAC attributes (i.e. both entries have different accessauths,
etc.) - The PATH env. variable has /etc before /usr/sbin - When
an authorized user having role to execute the /usr/sbin/pshare,
runs "pshare" cmd, it may fail.  The accessx() is resolving to
incorrect object in above example because vnode is passed for
RBAC verification and hardlink objects have same vnode. The
"type pshare" returns /etc/pshare instead of /usr/sbin/pshare.

    



Problem conclusion


    

  • Do not pass vnode from accessx() for RBAC verification and
resolve proper object as part of RBAC table lookup process.

    



Temporary fix


    

  • 



Comments


    

  • 6100-09 - use AIX APAR IV55576
6100-09 - use AIX APAR IV55576
6100-09 - use AIX APAR IV55576
7100-03 - use AIX APAR IV55629
7100-04 - use AIX APAR IV55683

    



APAR Information




    

  • APAR number
    IV55629
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2014-02-18
    • 

  • Closed date
    2014-02-18
    • 

  • Last modified date
    2016-05-10
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    
IV55576
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U858978
       UP14/05/22  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            10 May 2016
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
Page Feedback