8c666d2ab5
Since livepatching depends upon ftrace handlers to implement "patched" code functionality, verify that the ftrace_enabled sysctl value interacts with livepatch registration as expected. At the same time, ensure that ftrace_enabled is set and part of the test environment configuration that is saved and restored when running the selftests. Link: http://lkml.kernel.org/r/20191016113316.13415-4-mbenes@suse.cz Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
65 lines
2.3 KiB
Bash
Executable file
65 lines
2.3 KiB
Bash
Executable file
#!/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
|
|
|
|
|
|
# TEST: livepatch interaction with ftrace_enabled sysctl
|
|
# - 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
|
|
|
|
echo -n "TEST: livepatch interaction with ftrace_enabled sysctl ... "
|
|
dmesg -C
|
|
|
|
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 kernel.ftrace_enabled = 0
|
|
% 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
|