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_dynamic_debug() {
33 DYNAMIC_DEBUG=$(grep '^kernel/livepatch' /sys/kernel/debug/dynamic_debug/control | \
34 awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
37 function pop_dynamic_debug() {
38 if [[ -n "$DYNAMIC_DEBUG" ]]; then
39 echo -n "$DYNAMIC_DEBUG" > /sys/kernel/debug/dynamic_debug/control
43 # set_dynamic_debug() - save the current dynamic debug config and tweak
44 # it for the self-tests. Set a script exit trap
45 # that restores the original config.
46 function set_dynamic_debug() {
48 trap pop_dynamic_debug EXIT INT TERM HUP
49 cat <<-EOF > /sys/kernel/debug/dynamic_debug/control
50 file kernel/livepatch/* +p
51 func klp_try_switch_task -p
55 # loop_until(cmd) - loop a command until it is successful or $MAX_RETRIES,
56 # sleep $RETRY_INTERVAL between attempts
57 # cmd - command and its arguments to run
58 function loop_until() {
62 eval "$cmd" && return 0
63 [[ $((i++)) -eq $MAX_RETRIES ]] && return 1
68 function assert_mod() {
71 modprobe --dry-run "$mod" &>/dev/null
74 function is_livepatch_mod() {
77 if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
84 function __load_mod() {
87 local msg="% modprobe $mod $*"
89 ret=$(modprobe "$mod" "$@" 2>&1)
90 if [[ "$ret" != "" ]]; then
94 # Wait for module in sysfs ...
95 loop_until '[[ -e "/sys/module/$mod" ]]' ||
96 die "failed to load module $mod"
100 # load_mod(modname, params) - load a kernel module
101 # modname - module name to load
102 # params - module parameters to pass to modprobe
103 function load_mod() {
104 local mod="$1"; shift
107 skip "unable to load module ${mod}, verify CONFIG_TEST_LIVEPATCH=m and run self-tests as root"
109 is_livepatch_mod "$mod" &&
110 die "use load_lp() to load the livepatch module $mod"
112 __load_mod "$mod" "$@"
115 # load_lp_nowait(modname, params) - load a kernel module with a livepatch
116 # but do not wait on until the transition finishes
117 # modname - module name to load
118 # params - module parameters to pass to modprobe
119 function load_lp_nowait() {
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 "module $mod is not a livepatch"
128 __load_mod "$mod" "$@"
130 # Wait for livepatch in sysfs ...
131 loop_until '[[ -e "/sys/kernel/livepatch/$mod" ]]' ||
132 die "failed to load module $mod (sysfs)"
135 # load_lp(modname, params) - load a kernel module with a livepatch
136 # modname - module name to load
137 # params - module parameters to pass to modprobe
139 local mod="$1"; shift
141 load_lp_nowait "$mod" "$@"
143 # Wait until the transition finishes ...
144 loop_until 'grep -q '^0$' /sys/kernel/livepatch/$mod/transition' ||
145 die "failed to complete transition"
148 # load_failing_mod(modname, params) - load a kernel module, expect to fail
149 # modname - module name to load
150 # params - module parameters to pass to modprobe
151 function load_failing_mod() {
152 local mod="$1"; shift
154 local msg="% modprobe $mod $*"
156 ret=$(modprobe "$mod" "$@" 2>&1)
157 if [[ "$ret" == "" ]]; then
158 die "$mod unexpectedly loaded"
163 # unload_mod(modname) - unload a kernel module
164 # modname - module name to unload
165 function unload_mod() {
168 # Wait for module reference count to clear ...
169 loop_until '[[ $(cat "/sys/module/$mod/refcnt") == "0" ]]' ||
170 die "failed to unload module $mod (refcnt)"
173 ret=$(rmmod "$mod" 2>&1)
174 if [[ "$ret" != "" ]]; then
178 # Wait for module in sysfs ...
179 loop_until '[[ ! -e "/sys/module/$mod" ]]' ||
180 die "failed to unload module $mod (/sys/module)"
183 # unload_lp(modname) - unload a kernel module with a livepatch
184 # modname - module name to unload
185 function unload_lp() {
189 # disable_lp(modname) - disable a livepatch
190 # modname - module name to unload
191 function disable_lp() {
194 log "% echo 0 > /sys/kernel/livepatch/$mod/enabled"
195 echo 0 > /sys/kernel/livepatch/"$mod"/enabled
197 # Wait until the transition finishes and the livepatch gets
198 # removed from sysfs...
199 loop_until '[[ ! -e "/sys/kernel/livepatch/$mod" ]]' ||
200 die "failed to disable livepatch $mod"
203 # set_pre_patch_ret(modname, pre_patch_ret)
204 # modname - module name to set
205 # pre_patch_ret - new pre_patch_ret value
206 function set_pre_patch_ret {
207 local mod="$1"; shift
210 log "% echo $ret > /sys/module/$mod/parameters/pre_patch_ret"
211 echo "$ret" > /sys/module/"$mod"/parameters/pre_patch_ret
213 # Wait for sysfs value to hold ...
214 loop_until '[[ $(cat "/sys/module/$mod/parameters/pre_patch_ret") == "$ret" ]]' ||
215 die "failed to set pre_patch_ret parameter for $mod module"
218 # check_result() - verify dmesg output
219 # TODO - better filter, out of order msgs, etc?
220 function check_result {
224 result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')
226 if [[ "$expect" == "$result" ]] ; then
229 echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
230 die "livepatch kselftest(s) failed"