Commit 474eecc8 authored by Filipe Xavier's avatar Filipe Xavier Committed by Petr Mladek
Browse files

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



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

Signed-off-by: default avatarFilipe Xavier <felipeaggger@gmail.com>
Acked-by: default avatarMiroslav Benes <mbenes@suse.cz>
Acked-by: default avatarJoe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Tested-by: default avatarPetr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20250324-ftrace-sftest-livepatch-v3-2-d9d7cc386c75@gmail.com


Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
parent 2ca7cd80

tools/testing/selftests/livepatch/test-ftrace.sh

+34 −0
Original line number Diff line number Diff line
@@ -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