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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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selftests: livepatch: test-ftrace: livepatch a traced function

This is basically the inverse case of commit 474eecc882ae
("selftests: livepatch: test if ftrace can trace a livepatched function")
but ensuring that livepatch would work on a traced function.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Link: https://patch.msgid.link/20260220-lp-test-trace-v1-1-4b6703cd01a6@suse.com
[pmladek: Fixed a typo found by Joe.]
Signed-off-by: Petr Mladek <pmladek@suse.com>

authored by

Marcos Paulo de Souza and committed by
Petr Mladek 920e5001 51ab33fc

+36
+36
tools/testing/selftests/livepatch/test-ftrace.sh
··· 95 95 livepatch: '$MOD_LIVEPATCH': unpatching complete 96 96 % rmmod $MOD_LIVEPATCH" 97 97 98 + 99 + # - trace a function 100 + # - verify livepatch can load targgeting on the same traced function 101 + # - check if the livepatch is in effect 102 + # - reset trace and unload livepatch 103 + 104 + start_test "livepatch a traced function and check that the live patch remains in effect" 105 + 106 + FUNCTION_NAME="cmdline_proc_show" 107 + 108 + trace_function "$FUNCTION_NAME" 109 + load_lp $MOD_LIVEPATCH 110 + 111 + if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then 112 + log "livepatch: ok" 113 + fi 114 + 115 + check_traced_functions "$FUNCTION_NAME" 116 + 117 + disable_lp $MOD_LIVEPATCH 118 + unload_lp $MOD_LIVEPATCH 119 + 120 + check_result "% insmod test_modules/$MOD_LIVEPATCH.ko 121 + livepatch: enabling patch '$MOD_LIVEPATCH' 122 + livepatch: '$MOD_LIVEPATCH': initializing patching transition 123 + livepatch: '$MOD_LIVEPATCH': starting patching transition 124 + livepatch: '$MOD_LIVEPATCH': completing patching transition 125 + livepatch: '$MOD_LIVEPATCH': patching complete 126 + livepatch: ok 127 + % echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled 128 + livepatch: '$MOD_LIVEPATCH': initializing unpatching transition 129 + livepatch: '$MOD_LIVEPATCH': starting unpatching transition 130 + livepatch: '$MOD_LIVEPATCH': completing unpatching transition 131 + livepatch: '$MOD_LIVEPATCH': unpatching complete 132 + % rmmod $MOD_LIVEPATCH" 133 + 98 134 exit 0