IV82080: SEGMENTATION FAULT IN RULESCFGSET IF MOTD BIGGER THAN 1024 CHARS

APAR status

• Closed as program error.

Error description

• The rulescfgset command may produce a "Segmentation
  fault"
  issue when /etc/motd file is bigger than 1024 characters.
  If core dump file is produced, the stack trace will show
  something similar to :
   (dbx) where
   .() at 0xf050
   fread_unlocked(??, ??, ??, ??) at 0xd01228d8
   fread@AF5_4(??, ??, ??, ??) at 0xd0122bf8
   vioReadEntireFile(??, ??, ??) at 0xd55145b4
   vioRemoveMsgFromFile(??, ??, ??) at 0xd55147bc
   rulescfgset_clear_motd(??) at 0xd122876c
   main(??, ??) at 0x1000057c
  

Local fix

• Decrease the number of characters in motd file
  under 1024 bytes.
  

Problem summary

• When rulescfgset is run, it tries to clear the alert it put
  in /etc/motd.
  If /etc/motd is larger than 1024 characters, then this part
  of the operation can core dump before it has a chance to
  remove the message from /etc/motd.
  
  However it will have successfully updated the system settings
  before the core dump, so the motd edit is the only thing left
  undone.
  

Problem conclusion

• Change the way we read in the motd prior to removing our
  message so that it can successfully read in a motd larger than
  1024 chars without core dump.
  

Temporary fix

Comments

APAR Information

• 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

  VIRTUAL I/O SER

• Fixed component ID

  5765G3400

Applicable component levels