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MA42796 - LIC-SRCB6000302-UNPRED Data Copied Corrupts the Call Stack

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-SRCB6000302-UNPRED Data Copied Corrupts the Call Stack

Error Description

LIC support for the internal-use only, MI Instruction Retrieve  
Data from Teraspace of Another Process (RETDTSAP) is creating a
segment whose size is too small for a copy length that is      
greater than 256MB.  No more than 32-bytes, the size of a      
segment header, are expected to exceed the segment capacity.    
Any left over bytes are copied into a 32-byte local variable.  
For the failing case, more than 32-bytes did not fit into the  
too small segment.  Therefore, the copy of left over bytes      
overlaid other stack frames in the privileged stack, thus      
corrupting the call stack.                                      

Problem Summary

****************************************************************
* PROBLEM: (MA42796) Licensed Program = 5761999 for i 6.1      *
*                                       and i 6.1.1            *
*                                       5770999 for i 7.1      *
*           Crash/Hang Requiring an IPL to Recover             *
*           SRC B600 0302                                      *
****************************************************************
* USERS AFFECTED: All IBM operating system users.              *
****************************************************************
* RECOMMENDATION: Apply LIC PTF MF57012 for i 6.1.             *
*                 Apply LIC PTF MF57011 for i 6.1.1.           *
*                 Apply LIC PTF MF56962 for i 7.1.             *
****************************************************************
IBM i requests to copy more than 256MB of teraspace.  The copy  
corrupts the call stack and results in a crash of the partition.

Problem Conclusion

The Licensed Internal Code that performs the teraspace copy has
been corrected to avoid the copy of excessive bytes of data into
the call stack.  This prevents the stack corruption when IBM i  
requests to copy more than 256MB of teraspace.                  

Temporary Fix

                        *********                              
                        * HIPER *                              
                        *********                              

Comments

Circumvention


PTFs Available

R610 MF57012 PTF Cover Letter   3312
R611 MF57011 PTF Cover Letter   3312
R710 MF56962 PTF Cover Letter   3298

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R710
Duplicate Of..............................




System i Support

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Document Information

Modified date:
16 November 2013