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 $0)/functions.sh
   7
   8 MOD_SYSCALL=test_klp_syscall
   9
  10 setup_config
  11
  12 # - Start _NRPROC processes calling getpid and load a livepatch to patch the
  13 #   getpid syscall. Check if all the processes transitioned to the livepatched
  14 #   state.
  15
  16 start_test "patch getpid syscall while being heavily hammered"
  17
  18 NPROC=$(getconf _NPROCESSORS_ONLN)
  19 MAXPROC=128
  20
  21 for i in $(seq 1 $(($NPROC < $MAXPROC ? $NPROC : $MAXPROC))); do
  22         ./test_klp-call_getpid &
  23         pids[$i]="$!"
  24 done
  25
  26 pid_list=$(echo ${pids[@]} | tr ' ' ',')
  27 load_lp $MOD_SYSCALL klp_pids=$pid_list
  28
  29 # wait for all tasks to transition to patched state
  30 loop_until 'grep -q '^0$' $SYSFS_KERNEL_DIR/$MOD_SYSCALL/npids'
  31
  32 pending_pids=$(cat $SYSFS_KERNEL_DIR/$MOD_SYSCALL/npids)
  33 log "$MOD_SYSCALL: Remaining not livepatched processes: $pending_pids"
  34
  35 for pid in ${pids[@]}; do
  36         kill $pid || true
  37 done
  38
  39 disable_lp $MOD_SYSCALL
  40 unload_lp $MOD_SYSCALL
  41
  42 check_result "% insmod test_modules/$MOD_SYSCALL.ko klp_pids=$pid_list
  43 livepatch: enabling patch '$MOD_SYSCALL'
  44 livepatch: '$MOD_SYSCALL': initializing patching transition
  45 livepatch: '$MOD_SYSCALL': starting patching transition
  46 livepatch: '$MOD_SYSCALL': completing patching transition
  47 livepatch: '$MOD_SYSCALL': patching complete
  48 $MOD_SYSCALL: Remaining not livepatched processes: 0
  49 % echo 0 > $SYSFS_KLP_DIR/$MOD_SYSCALL/enabled
  50 livepatch: '$MOD_SYSCALL': initializing unpatching transition
  51 livepatch: '$MOD_SYSCALL': starting unpatching transition
  52 livepatch: '$MOD_SYSCALL': completing unpatching transition
  53 livepatch: '$MOD_SYSCALL': unpatching complete
  54 % rmmod $MOD_SYSCALL"
  55
  56 exit 0