[Bug 1978130] Re: Ubuntu22.04: glibc: __strncpy_power9() uses uninitialised register vs18 value for filling after \0

[Frank Heimes]

** Changed in: ubuntu-power-systems
       Status: New => In Progress

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Title:
  Ubuntu22.04: glibc: __strncpy_power9() uses uninitialised register
  vs18 value for filling after \0

Status in The Ubuntu-power-systems project:
  In Progress
Status in glibc package in Ubuntu:
  New
Status in glibc source package in Jammy:
  In Progress

Bug description:
  == Comment: #0 - Tulio Magno Quites Machado Filho <tulioqm at br.ibm.com> - 2022-06-08 08:35:44 ==
  ---Problem Description---
  __strncpy_power9() uses uninitialised register vs18 value for filling after \0

  The fix has already been applied upstream for glibc 2.36 and has been
  backported to glibc >= 2.33.

  Commit for glibc 2.36:
  https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=0218463dd8265ed937622f88ac68c7d984fe0cfc

  Commit for glibc 2.35:
  https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=0a1572b8bb880a63d50a63b2afe4bb67704ac23e
   
  Contact Information = Tulio Magno Quites Machado Filho/tulioqm at br.ibm.com 
   
  ---Additional Hardware Info---
  Requires Power9 or Power10 to reproduce 

   
  ---uname output---
  N/A
   
  Machine Type = N/A 
   
  ---Debugger---
  A debugger is not configured
   
  ---Steps to Reproduce---
   See the description from the bug reported upstream at: https://sourceware.org/bugzilla/show_bug.cgi?id=29197
   
  Userspace tool common name: glibc 
   
  The userspace tool has the following bit modes: glibc 

  Userspace rpm: libc6

  Userspace tool obtained from project website:  na 
   
  *Additional Instructions for Tulio Magno Quites Machado Filho/tulioqm at br.ibm.com:
  -Attach ltrace and strace of userspace application.

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