tools/testing/selftests/livepatch/test-syscall.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright (C) 2023 SUSE
   4 # Author: Marcos Paulo de Souza <mpdesouza@suse.com>
   5
   6 . $(dirname $0)/functions.sh
   7
   8 MOD_SYSCALL=test_klp_syscall
   9
  10 setup_config
  11
  12 # - Start _NRPROC processes calling getpid and load a livepatch to patch the
  13 #   getpid syscall. Check if all the processes transitioned to the livepatched
  14 #   state.
  15
  16 start_test "patch getpid syscall while being heavily hammered"
  17
  18 for i in $(seq 1 $(getconf _NPROCESSORS_ONLN)); do
  19         ./test_klp-call_getpid &
  20         pids[$i]="$!"
  21 done
  22
  23 pid_list=$(echo ${pids[@]} | tr ' ' ',')
  24 load_lp $MOD_SYSCALL klp_pids=$pid_list
  25
  26 # wait for all tasks to transition to patched state
  27 loop_until 'grep -q '^0$' /sys/kernel/test_klp_syscall/npids'
  28
  29 pending_pids=$(cat /sys/kernel/test_klp_syscall/npids)
  30 log "$MOD_SYSCALL: Remaining not livepatched processes: $pending_pids"
  31
  32 for pid in ${pids[@]}; do
  33         kill $pid || true
  34 done
  35
  36 disable_lp $MOD_SYSCALL
  37 unload_lp $MOD_SYSCALL
  38
  39 check_result "% insmod test_modules/$MOD_SYSCALL.ko klp_pids=$pid_list
  40 livepatch: enabling patch '$MOD_SYSCALL'
  41 livepatch: '$MOD_SYSCALL': initializing patching transition
  42 livepatch: '$MOD_SYSCALL': starting patching transition
  43 livepatch: '$MOD_SYSCALL': completing patching transition
  44 livepatch: '$MOD_SYSCALL': patching complete
  45 $MOD_SYSCALL: Remaining not livepatched processes: 0
  46 % echo 0 > /sys/kernel/livepatch/$MOD_SYSCALL/enabled
  47 livepatch: '$MOD_SYSCALL': initializing unpatching transition
  48 livepatch: '$MOD_SYSCALL': starting unpatching transition
  49 livepatch: '$MOD_SYSCALL': completing unpatching transition
  50 livepatch: '$MOD_SYSCALL': unpatching complete
  51 % rmmod $MOD_SYSCALL"
  52
  53 exit 0