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#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # Copyright (C) 2019 Joe Lawrence <joe.lawrence@redhat.com> . $(dirname $0)/functions.sh MOD_LIVEPATCH=test_klp_livepatch setup_config # - turn ftrace_enabled OFF and verify livepatches can't load # - turn ftrace_enabled ON and verify livepatch can load # - verify that ftrace_enabled can't be turned OFF while a livepatch is loaded start_test "livepatch interaction with ftrace_enabled sysctl" set_ftrace_enabled 0 load_failing_mod $MOD_LIVEPATCH set_ftrace_enabled 1 load_lp $MOD_LIVEPATCH if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then echo -e "FAIL\n\n" die "livepatch kselftest(s) failed" fi set_ftrace_enabled 0 if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then echo -e "FAIL\n\n" die "livepatch kselftest(s) failed" fi disable_lp $MOD_LIVEPATCH unload_lp $MOD_LIVEPATCH check_result "livepatch: kernel.ftrace_enabled = 0 % modprobe $MOD_LIVEPATCH livepatch: enabling patch '$MOD_LIVEPATCH' livepatch: '$MOD_LIVEPATCH': initializing patching transition livepatch: failed to register ftrace handler for function 'cmdline_proc_show' (-16) livepatch: failed to patch object 'vmlinux' livepatch: failed to enable patch '$MOD_LIVEPATCH' livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch livepatch: '$MOD_LIVEPATCH': completing unpatching transition livepatch: '$MOD_LIVEPATCH': unpatching complete modprobe: ERROR: could not insert '$MOD_LIVEPATCH': Device or resource busy livepatch: kernel.ftrace_enabled = 1 % modprobe $MOD_LIVEPATCH livepatch: enabling patch '$MOD_LIVEPATCH' livepatch: '$MOD_LIVEPATCH': initializing patching transition livepatch: '$MOD_LIVEPATCH': starting patching transition livepatch: '$MOD_LIVEPATCH': completing patching transition livepatch: '$MOD_LIVEPATCH': patching complete livepatch: sysctl: setting key \"kernel.ftrace_enabled\": Device or resource busy % echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled livepatch: '$MOD_LIVEPATCH': initializing unpatching transition livepatch: '$MOD_LIVEPATCH': starting unpatching transition livepatch: '$MOD_LIVEPATCH': completing unpatching transition livepatch: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" exit 0