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IJ44144: WARNINGS IN MMBUILDGPL ON KERNEL WITH RETBLEED FIXES

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APAR status

  • Closed as program error.

Error description

  • Fixes for the retbleed vulnerability are backported to kernel
updates in Linux distributions. These fixes also include checks
whether the kernel module build has properly applied the rtbleed
mitigations. Parts of the kdump binary built by mmbuildgpl does
purposefully not include these mitigations. As a result,
the mmbuildgpl process will emit warning messages:


CC [M]  /usr/lpp/mmfs/src/gpl-linux/kdump-kern.o
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetOffset()+0x14: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
KernInit()+0x1b1: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GenericGet()+0x74: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GenericGet()+0x83: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiInit()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiNext()+0x85: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiNext()+0xbd: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetDentry()+0x40: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetDentry()+0x86: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintDentryTreeRecur()+0x160: 'naked' return found in RETHUNK
build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
FreeDentry()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetRootSuperBlock()+0x50: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetTaskStructByPID()+0x7a: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetTaskStructByPID()+0x99: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintDentry()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintFSStruct()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintVFSMount()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintInode()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintSuperBlock()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintPage()+0x4a: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintAddressSpace()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintVMAreaStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintMMStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintTaskStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
DoPs()+0x7b: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x124: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x1b0: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x1d0: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
ReadElfNote()+0xbc: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
ReadKernelCore()+0x279: 'naked' return found in RETHUNK build

Local fix

  • There is no easy workaround. Without code changes, the
only way forward is to ignore those warnings,
no other ill effect will happen.

Problem summary

  • Fixes for the retbleed vulnerability are backported to kernel
updates in Linux distributions. These fixes also include checks
whether the kernel module build has properly applied the rtbleed
mitigations. Parts of the kdump binary built by mmbuildgpl does
purposefully not include these mitigations. As a result,
the mmbuildgpl process will emit warning messages:


CC [M]  /usr/lpp/mmfs/src/gpl-linux/kdump-kern.o
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetOffset()+0x14: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
KernInit()+0x1b1: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GenericGet()+0x74: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GenericGet()+0x83: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiInit()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiNext()+0x85: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
tiNext()+0xbd: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetDentry()+0x40: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetDentry()+0x86: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintDentryTreeRecur()+0x160: 'naked' return found in RETHUNK
build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
FreeDentry()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetRootSuperBlock()+0x50: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetTaskStructByPID()+0x7a: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
GetTaskStructByPID()+0x99: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintDentry()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintFSStruct()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintVFSMount()+0x2e: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintInode()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintSuperBlock()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintPage()+0x4a: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintAddressSpace()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintVMAreaStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintMMStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
PrintTaskStruct()+0x3c: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
DoPs()+0x7b: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x124: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x1b0: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
BacktracePid()+0x1d0: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
ReadElfNote()+0xbc: 'naked' return found in RETHUNK build
/usr/lpp/mmfs/src/gpl-linux/.tmp_kdump-kern.o: warning: objtool:
ReadKernelCore()+0x279: 'naked' return found in RETHUNK build

Problem conclusion

  • This problem is fixed in 5.1.2 PTF 8
To see all Spectrum Scale APARs and
their respective fix solutions refer to page
https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale_
apars.html


Benefits of the solution:
mmbuildgpl will run again without printing these warning
messages.

Work Around:
There is no easy workaround. Without code changes, the
only way forward is to ignore those warnings,
no other ill effect will happen.

Problem trigger:
Running mmbuildgpl on a kernel that has all fixes
for the retbleed vulnerability.

Symptom:
Error output/message
Platforms affected: x86_64-linux only
Functional Area affected:
All Scale Users
Customer Impact: Suggested

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ44144
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    512
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2022-11-08
    • 

  • Closed date
    2022-11-08
    • 

  • Last modified date
    2022-11-08
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    SPEC SCALE STD
    • 

  • Fixed component ID
    5737F33AP
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"512","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            08 November 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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