scripts/system-tests/kprobe-fuzzing.sh

   1 #!/bin/bash -xeu
   2 # Copyright (C) 2017 - Francis Deslauriers <francis.deslauriers@efficios.com>
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 NB_KPROBE_PER_ITER=500
  18 SESSION_NAME="my_kprobe_session"
  19
  20 # Silence the script to avoid redirection of kallsyms to fill the screen
  21 set +x
  22 syms=$(awk '{print $3;}' /proc/kallsyms | sort -R)
  23 nb_syms=$(echo "$syms" | wc -l)
  24 set -x
  25
  26 # Loop over the list of symbols and enable the symbols in groups of
  27 # $NB_KPROBE_PER_ITER
  28 for i in $(seq 0 "$NB_KPROBE_PER_ITER" "$nb_syms"); do
  29         # Print time in UTC at each iteration to easily see when the script
  30         # hangs
  31         date --utc
  32
  33         # Pick $NB_KPROBE_PER_ITER symbols to instrument, craft enable-event
  34         # command and save them to a file. We craft the commands and executed
  35         # them in two steps so that the pipeline can be done without the bash
  36         # '-x' option that would fill the serial buffer because of the multiple
  37         # pipe redirections.
  38         set +x
  39         echo "$syms" | head -n $((i+NB_KPROBE_PER_ITER)) | tail -n $NB_KPROBE_PER_ITER |awk '{print "lttng enable-event --kernel --function=" $1 " " $1}' > lttng-enable-event.sh
  40         set -x
  41
  42         # Print what iteration we are at
  43         echo "$i" $((i+NB_KPROBE_PER_ITER))
  44
  45         # Destroy previous session and create a new one
  46         lttng create "$SESSION_NAME"
  47
  48         # Expect commands to fail, turn off early exit of shell script on
  49         # non-zero return value
  50         set +e
  51         source  ./lttng-enable-event.sh
  52         set -e
  53
  54         # Run stress util to generate some kernel activity
  55         stress --cpu 2 --io 4 --vm 2 --vm-bytes 128M --hdd 3 --timeout 5s
  56
  57         lttng list "$SESSION_NAME"
  58         lttng destroy "$SESSION_NAME"
  59 done