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

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright (C) 2024 SUSE
   4 # Author: Michael Vetter <mvetter@suse.com>
   5
   6 . $(dirname $0)/functions.sh
   7
   8 MOD_LIVEPATCH=test_klp_livepatch
   9 MOD_KPROBE=test_klp_kprobe
  10
  11 setup_config
  12
  13 # Kprobe a function and verify that we can't livepatch that same function
  14 # when it uses a post_handler since only one IPMODIFY maybe be registered
  15 # to any given function at a time.
  16
  17 start_test "livepatch interaction with kprobed function with post_handler"
  18
  19 echo 1 > "$SYSFS_KPROBES_DIR/enabled"
  20
  21 load_mod $MOD_KPROBE has_post_handler=true
  22 load_failing_mod $MOD_LIVEPATCH
  23 unload_mod $MOD_KPROBE
  24
  25 check_result "% insmod test_modules/test_klp_kprobe.ko has_post_handler=true
  26 % insmod test_modules/$MOD_LIVEPATCH.ko
  27 livepatch: enabling patch '$MOD_LIVEPATCH'
  28 livepatch: '$MOD_LIVEPATCH': initializing patching transition
  29 livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16)
  30 livepatch: failed to patch object 'vmlinux'
  31 livepatch: failed to enable patch '$MOD_LIVEPATCH'
  32 livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
  33 livepatch: '$MOD_LIVEPATCH': completing unpatching transition
  34 livepatch: '$MOD_LIVEPATCH': unpatching complete
  35 insmod: ERROR: could not insert module test_modules/$MOD_LIVEPATCH.ko: Device or resource busy
  36 % rmmod test_klp_kprobe"
  37
  38 start_test "livepatch interaction with kprobed function without post_handler"
  39
  40 load_mod $MOD_KPROBE has_post_handler=false
  41 load_lp $MOD_LIVEPATCH
  42
  43 unload_mod $MOD_KPROBE
  44 disable_lp $MOD_LIVEPATCH
  45 unload_lp $MOD_LIVEPATCH
  46
  47 check_result "% insmod test_modules/test_klp_kprobe.ko has_post_handler=false
  48 % insmod test_modules/$MOD_LIVEPATCH.ko
  49 livepatch: enabling patch '$MOD_LIVEPATCH'
  50 livepatch: '$MOD_LIVEPATCH': initializing patching transition
  51 livepatch: '$MOD_LIVEPATCH': starting patching transition
  52 livepatch: '$MOD_LIVEPATCH': completing patching transition
  53 livepatch: '$MOD_LIVEPATCH': patching complete
  54 % rmmod test_klp_kprobe
  55 % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
  56 livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
  57 livepatch: '$MOD_LIVEPATCH': starting unpatching transition
  58 livepatch: '$MOD_LIVEPATCH': completing unpatching transition
  59 livepatch: '$MOD_LIVEPATCH': unpatching complete
  60 % rmmod $MOD_LIVEPATCH"
  61
  62 exit 0