2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
5 # Shell functions for the rest of the scripts.
8 RETRY_INTERVAL=".1" # seconds
10 # log(msg) - write message to kernel log
11 # msg - insightful words
16 # skip(msg) - testing can't proceed
24 # die(msg) - game over, man
32 function push_config() {
33 DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
34 awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
35 FTRACE_ENABLED=$(sysctl --values kernel.ftrace_enabled)
38 function pop_config() {
39 if [[ -n "$DYNAMIC_DEBUG" ]]; then
40 echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control
42 if [[ -n "$FTRACE_ENABLED" ]]; then
43 sysctl kernel.ftrace_enabled="$FTRACE_ENABLED" &> /dev/null
47 function set_dynamic_debug() {
48 cat <<-EOF > /sys/kernel/debug/dynamic_debug/control
49 file kernel/livepatch/* +p
50 func klp_try_switch_task -p
54 function set_ftrace_enabled() {
56 result=$(sysctl kernel.ftrace_enabled="$1" 2>&1 | paste --serial --delimiters=' ')
57 echo "livepatch: $result" > /dev/kmsg
60 # setup_config - save the current config and set a script exit trap that
61 # restores the original config. Setup the dynamic debug
62 # for verbose livepatching output and turn on
63 # the ftrace_enabled sysctl.
64 function setup_config() {
68 trap pop_config EXIT INT TERM HUP
71 # loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,
72 # sleep $RETRY_INTERVAL between attempts
73 # cmd - command and its arguments to run
74 function loop_until() {
78 eval "$cmd" && return 0
79 [[ $((i++)) -eq $MAX_RETRIES ]] && return 1
84 function assert_mod() {
87 modprobe --dry-run "$mod" &>/dev/null
90 function is_livepatch_mod() {
93 if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
100 function __load_mod() {
101 local mod="$1"; shift
103 local msg="% modprobe $mod $*"
105 ret=$(modprobe "$mod" "$@" 2>&1)
106 if [[ "$ret" != "" ]]; then
110 # Wait for module in sysfs ...
111 loop_until '[[ -e "/sys/module/$mod" ]]' ||
112 die "failed to load module $mod"
116 # load_mod(modname, params) - load a kernel module
117 # modname - module name to load
118 # params - module parameters to pass to modprobe
119 function load_mod() {
120 local mod="$1"; shift
123 skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root"
125 is_livepatch_mod "$mod" &&
126 die "use load_lp() to load the livepatch module $mod"
128 __load_mod "$mod" "$@"
131 # load_lp_nowait(modname, params) - load a kernel module with a livepatch
132 # but do not wait on until the transition finishes
133 # modname - module name to load
134 # params - module parameters to pass to modprobe
135 function load_lp_nowait() {
136 local mod="$1"; shift
139 skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root"
141 is_livepatch_mod "$mod" ||
142 die "module $mod is not a livepatch"
144 __load_mod "$mod" "$@"
146 # Wait for livepatch in sysfs ...
147 loop_until '[[ -e "/sys/kernel/livepatch/$mod" ]]' ||
148 die "failed to load module $mod (sysfs)"
151 # load_lp(modname, params) - load a kernel module with a livepatch
152 # modname - module name to load
153 # params - module parameters to pass to modprobe
155 local mod="$1"; shift
157 load_lp_nowait "$mod" "$@"
159 # Wait until the transition finishes ...
160 loop_until 'grep -q '^0$' /sys/kernel/livepatch/$mod/transition' ||
161 die "failed to complete transition"
164 # load_failing_mod(modname, params) - load a kernel module, expect to fail
165 # modname - module name to load
166 # params - module parameters to pass to modprobe
167 function load_failing_mod() {
168 local mod="$1"; shift
170 local msg="% modprobe $mod $*"
172 ret=$(modprobe "$mod" "$@" 2>&1)
173 if [[ "$ret" == "" ]]; then
174 die "$mod unexpectedly loaded"
179 # unload_mod(modname) - unload a kernel module
180 # modname - module name to unload
181 function unload_mod() {
184 # Wait for module reference count to clear ...
185 loop_until '[[ $(cat "/sys/module/$mod/refcnt") == "0" ]]' ||
186 die "failed to unload module $mod (refcnt)"
189 ret=$(rmmod "$mod" 2>&1)
190 if [[ "$ret" != "" ]]; then
194 # Wait for module in sysfs ...
195 loop_until '[[ ! -e "/sys/module/$mod" ]]' ||
196 die "failed to unload module $mod (/sys/module)"
199 # unload_lp(modname) - unload a kernel module with a livepatch
200 # modname - module name to unload
201 function unload_lp() {
205 # disable_lp(modname) - disable a livepatch
206 # modname - module name to unload
207 function disable_lp() {
210 log "% echo 0 > /sys/kernel/livepatch/$mod/enabled"
211 echo 0 > /sys/kernel/livepatch/"$mod"/enabled
213 # Wait until the transition finishes and the livepatch gets
214 # removed from sysfs...
215 loop_until '[[ ! -e "/sys/kernel/livepatch/$mod" ]]' ||
216 die "failed to disable livepatch $mod"
219 # set_pre_patch_ret(modname, pre_patch_ret)
220 # modname - module name to set
221 # pre_patch_ret - new pre_patch_ret value
222 function set_pre_patch_ret {
223 local mod="$1"; shift
226 log "% echo $ret > /sys/module/$mod/parameters/pre_patch_ret"
227 echo "$ret" > /sys/module/"$mod"/parameters/pre_patch_ret
229 # Wait for sysfs value to hold ...
230 loop_until '[[ $(cat "/sys/module/$mod/parameters/pre_patch_ret") == "$ret" ]]' ||
231 die "failed to set pre_patch_ret parameter for $mod module"
234 # check_result() - verify dmesg output
235 # TODO - better filter, out of order msgs, etc?
236 function check_result {
240 result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')
242 if [[ "$expect" == "$result" ]] ; then
245 echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
246 die "livepatch kselftest(s) failed"