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selftests: livepatch: test if ftrace can trace a livepatched function

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This new test makes sure that ftrace can trace a
function that was introduced by a livepatch.

Signed-off-by: Filipe Xavier <[email protected]>
Acked-by: Miroslav Benes <[email protected]>
Acked-by: Joe Lawrence <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Tested-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Petr Mladek <[email protected]>
This commit is contained in:
Filipe Xavier authored and Petr Mladek committed 2025-03-25 14:52:32 +01:00
1 parent 2ca7cd8020
commit 474eecc882
1 file changed
+34
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tools/testing/selftests/livepatch/test-ftrace.sh
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@@ -61,4 +61,38 @@ livepatch: '$MOD_LIVEPATCH': unpatching complete
% rmmod $MOD_LIVEPATCH"
# - verify livepatch can load
# - check if traces have a patched function
# - reset trace and unload livepatch
start_test "trace livepatched function and check that the live patch remains in effect"
FUNCTION_NAME="livepatch_cmdline_proc_show"
load_lp $MOD_LIVEPATCH
trace_function "$FUNCTION_NAME"
if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
log "livepatch: ok"
fi
check_traced_functions "$FUNCTION_NAME"
disable_lp $MOD_LIVEPATCH
unload_lp $MOD_LIVEPATCH
check_result "% insmod test_modules/$MOD_LIVEPATCH.ko
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: ok
% echo 0 > $SYSFS_KLP_DIR/$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