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IV43775: SYMLINK: 3K OF KERNEL MEMORY CORRUPTED BY LONG PATHNAME

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APAR status

  • Closed as program error.

Error description

  • In gpfs_i_follow_link, we allocate 1K buffer but
misrepresent it as a 4K buffer when calling gpfsReadlink.
Under normal conditions this is not harmful, because we
don't allow symlinks longer than 255 characters/1023 bytes,
but under some (not yet understood) conditions gpfsReadlink
may encounter a symlink object which has file size set larger,
and end up writing outside the allocated buffer.

Local fix

  • 



Problem summary


    

  • In gpfs_i_follow_link, we allocate 1K buffer but
misrepresent it as a 4K buffer when calling gpfsReadlink.
Under normal conditions this is not harmful, because we
don't allow symlinks longer than 255 characters/1023 bytes,
but under some (not yet understood) conditions gpfsReadlink
may encounter a symlink object which has file size set larger,
and end up writing outside the allocated buffer.

    



Problem conclusion


    

  • Avoid potential kernel heap corruption if unexpectedly large
symlink object is encountered

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV43775
    • 

  • Reported component name
    GPFS/AIX5L V3
    • 

  • Reported component ID
    5765G66AP
    • 

  • Reported release
    340
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2013-06-04
    • 

  • Closed date
    2013-06-04
    • 

  • Last modified date
    2015-05-14
    • 





    

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

    
IV43774
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    GPFS/AIX5L V3
    • 

  • Fixed component ID
    5765G66AP
    • 



Applicable component levels


    

  • R340  PSY  U869511
       15/05/14  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            22 August 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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