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IV53041: PAM LIBPAM.A LEAKS MEMORY

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APAR status

  • Closed as program error.

Error description

  • When an application continuously calls into
pam_authenticate with explicit conv routine
being called to prompt, the operating system
will eventually kill the process because
memory becomes exhausted. This is
because PAM libpam.a is not releasing
allocated memory.

Local fix

  • 



Problem summary


    

  • Application which calls pam_authenticate function in loop
causes the crash with following stack.

malloc_y(0x10, 0x0, 0x9001000a0071ee0, 0x9001000a00043a0,
0xffffffffffede80, 0x1, 0x0, 0x11005a110) at 0x900000000041dbc
malloc_common@AF103_87(??) at 0x900000000029f8c
malloc(??) at 0x900000000029d0c
calloc_common(??, ??) at 0x9000000000293dc
pam_framework_utils.__pam_input_output(??, ??, ??, ??, ??)
at 0x900000004198d50
pam_get_user(??, ??, ??) at 0x900000004197a70
pam_sm_authenticate(??, ??, ??, ??) at 0x90000000418fa80
pam_authenticate(??, ??) at 0x900000004196ac8
.() at 0x100171720

    



Problem conclusion


    

  • The crash is due to a memory leak in pam_authenticate function,
the memory leak has been resolved using this.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV53041
    • 

  • Reported component name
    AIX 5.3 EXT SUP
    • 

  • Reported component ID
    5765G0399
    • 

  • Reported release
    53E
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2013-12-09
    • 

  • Closed date
    2013-12-09
    • 

  • Last modified date
    2013-12-09
    • 





    

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

    
IV45815
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX 5.3 EXT SUP
    • 

  • Fixed component ID
    5765G0399
    • 



Applicable component levels


    

  • R53E  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            09 December 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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