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

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright (C) 2019 Joe Lawrence <joe.lawrence@redhat.com>
   4
   5 . $(dirname $0)/functions.sh
   6
   7 MOD_LIVEPATCH=test_klp_livepatch
   8
   9 setup_config
  10
  11
  12 # - turn ftrace_enabled OFF and verify livepatches can't load
  13 # - turn ftrace_enabled ON and verify livepatch can load
  14 # - verify that ftrace_enabled can't be turned OFF while a livepatch is loaded
  15
  16 start_test "livepatch interaction with ftrace_enabled sysctl"
  17
  18 set_ftrace_enabled 0
  19 load_failing_mod $MOD_LIVEPATCH
  20
  21 set_ftrace_enabled 1
  22 load_lp $MOD_LIVEPATCH
  23 if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
  24         echo -e "FAIL\n\n"
  25         die "livepatch kselftest(s) failed"
  26 fi
  27
  28 # Check that ftrace could not get disabled when a livepatch is enabled
  29 set_ftrace_enabled --fail 0
  30 if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
  31         echo -e "FAIL\n\n"
  32         die "livepatch kselftest(s) failed"
  33 fi
  34 disable_lp $MOD_LIVEPATCH
  35 unload_lp $MOD_LIVEPATCH
  36
  37 check_result "livepatch: kernel.ftrace_enabled = 0
  38 % insmod test_modules/$MOD_LIVEPATCH.ko
  39 livepatch: enabling patch '$MOD_LIVEPATCH'
  40 livepatch: '$MOD_LIVEPATCH': initializing patching transition
  41 livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
  42 livepatch: failed to patch object 'vmlinux'
  43 livepatch: failed to enable patch '$MOD_LIVEPATCH'
  44 livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
  45 livepatch: '$MOD_LIVEPATCH': completing unpatching transition
  46 livepatch: '$MOD_LIVEPATCH': unpatching complete
  47 insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Device or resource busy
  48 livepatch: kernel.ftrace_enabled = 1
  49 % insmod test_modules/$MOD_LIVEPATCH.ko
  50 livepatch: enabling patch '$MOD_LIVEPATCH'
  51 livepatch: '$MOD_LIVEPATCH': initializing patching transition
  52 livepatch: '$MOD_LIVEPATCH': starting patching transition
  53 livepatch: '$MOD_LIVEPATCH': completing patching transition
  54 livepatch: '$MOD_LIVEPATCH': patching complete
  55 livepatch: sysctl: setting key \"kernel.ftrace_enabled\": Device or resource busy
  56 % echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled
  57 livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
  58 livepatch: '$MOD_LIVEPATCH': starting unpatching transition
  59 livepatch: '$MOD_LIVEPATCH': completing unpatching transition
  60 livepatch: '$MOD_LIVEPATCH': unpatching complete
  61 % rmmod $MOD_LIVEPATCH"
  62
  63
  64 exit 0