[Bug 1955129] Re: trace-cmd report buffer overflow detected

[Ubuntu Foundations Team Bug Bot]

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1955129

Title:
  trace-cmd report buffer overflow detected

Status in trace-cmd package in Ubuntu:
  In Progress
Status in trace-cmd source package in Bionic:
  In Progress

Bug description:
  [IMPACT]

  When running trace-cmd report on Bionic it crashes with

  *** buffer overflow detected ***: trace-cmd terminated
  Aborted (core dumped)

  
  [TEST CASE]

  Prepare a simple script to trace e.g. :

  #!/usr/bin/python
  import socket
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.close()

  then

  $ sudo trace-cmd record -a -p function_graph -g __fput -g sock_close
  -g tcp_close python2 ./close.py

  $ sudo trace-cmd report

  The latter will fail with buffer overflow detected

  
  [WHERE THINGS COULD GO WRONG]

  The fixing commit changes the size of a buffer from 20 to 24 in arg_eval() function
  to avoid buffer overflow.
  Any potential regression would occur in that function.

  
  [OTHER]

  Only Bionic is affected, it is fixed in newer releases.

  Fix upstream commit 1375d98d8017e371776adbef10122a57ce2100e5

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